diff --git a/python/paddle/fluid/tests/unittests/test_accuracy_op.py b/python/paddle/fluid/tests/unittests/test_accuracy_op.py
index 0de81034d3373d10515f9aa40004f354b3934f5b..fc7666bcba742819df589016e7ddac471a36828f 100755
--- a/python/paddle/fluid/tests/unittests/test_accuracy_op.py
+++ b/python/paddle/fluid/tests/unittests/test_accuracy_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
diff --git a/python/paddle/fluid/tests/unittests/test_activation_nn_grad.py b/python/paddle/fluid/tests/unittests/test_activation_nn_grad.py
index e0c40e20021119dbd01e2f43e9a52cfb1b695a3a..4b3311120467df23d32b21bc8d2f5004d24680bb 100644
--- a/python/paddle/fluid/tests/unittests/test_activation_nn_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_activation_nn_grad.py
@@ -13,17 +13,17 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
 
-import paddle.fluid as fluid
 import paddle
-import paddle.fluid.layers as layers
+import paddle.fluid as fluid
 import paddle.fluid.core as core
-import gradient_checker
+import paddle.fluid.layers as layers
 import paddle.nn.functional as F
 
-from decorator_helper import prog_scope
-
 
 class TestSigmoidTripleGradCheck(unittest.TestCase):
     @prog_scope()
diff --git a/python/paddle/fluid/tests/unittests/test_activation_op.py b/python/paddle/fluid/tests/unittests/test_activation_op.py
index 6cfe72bfdfd395649ccbf193be98131f7305d780..9f5bbee0fc88b08c7c601211a0d68faf6c4ad4e1 100755
--- a/python/paddle/fluid/tests/unittests/test_activation_op.py
+++ b/python/paddle/fluid/tests/unittests/test_activation_op.py
@@ -15,13 +15,13 @@
 import unittest
 
 import numpy as np
-from scipy.special import expit, erf
-
 from op_test import OpTest, convert_float_to_uint16
+from scipy.special import erf, expit
+
 import paddle
-import paddle.nn.functional as F
 import paddle.fluid as fluid
 import paddle.fluid.core as core
+import paddle.nn.functional as F
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_activation_sparse_op.py b/python/paddle/fluid/tests/unittests/test_activation_sparse_op.py
index 472dc334d66524c5dcc0eb2142543f36fbc722f5..ad4f6c60fc1833130980cc5c1790fe32afaeb5a0 100644
--- a/python/paddle/fluid/tests/unittests/test_activation_sparse_op.py
+++ b/python/paddle/fluid/tests/unittests/test_activation_sparse_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid.core as core
 from paddle.fluid.op import Operator
-import paddle
 
 
 class TestSparseSquareOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_adadelta_op.py b/python/paddle/fluid/tests/unittests/test_adadelta_op.py
index 12122c8e05f37467acc74b0b7f2f38f9d3374843..73a3c1e1cbf7c028d430abc00ce52cde19d42084 100644
--- a/python/paddle/fluid/tests/unittests/test_adadelta_op.py
+++ b/python/paddle/fluid/tests/unittests/test_adadelta_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_adagrad_op.py b/python/paddle/fluid/tests/unittests/test_adagrad_op.py
index 036322ee62d615dd69bc22bcb54b1d8d5478112c..94a754ca3cecf53d105a9740da2a7246e24ad3bd 100644
--- a/python/paddle/fluid/tests/unittests/test_adagrad_op.py
+++ b/python/paddle/fluid/tests/unittests/test_adagrad_op.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 from op_test import OpTest
-import math
+
 import paddle
+import paddle.fluid.core as core
+from paddle.fluid.op import Operator
 
 
 class TestAdagradOp1(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_adagrad_op_v2.py b/python/paddle/fluid/tests/unittests/test_adagrad_op_v2.py
index c3eee954b610bfa26337745d5790941f37c98ebc..35d8aa9101001d8c756a3660a733b4d3898a18d8 100644
--- a/python/paddle/fluid/tests/unittests/test_adagrad_op_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_adagrad_op_v2.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_adam_op.py b/python/paddle/fluid/tests/unittests/test_adam_op.py
index 9904ee0d100a3df5a8065cd7d6eb5c86de74e56c..07fef0b4603e88113037c1f864d64bb700ccec1b 100644
--- a/python/paddle/fluid/tests/unittests/test_adam_op.py
+++ b/python/paddle/fluid/tests/unittests/test_adam_op.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from paddle.fluid import core
-from paddle.fluid.op import Operator
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
+from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.op import Operator
 
 
 class TestAdamOp1(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_adam_optimizer_fp32_fp64.py b/python/paddle/fluid/tests/unittests/test_adam_optimizer_fp32_fp64.py
index 904b02e778c25fe79a38f23e084826c91185d290..8e43728fb83da1487221df1ee8487be6fa93f789 100644
--- a/python/paddle/fluid/tests/unittests/test_adam_optimizer_fp32_fp64.py
+++ b/python/paddle/fluid/tests/unittests/test_adam_optimizer_fp32_fp64.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.fluid as fluid
-import unittest
 
 
 def get_places():
diff --git a/python/paddle/fluid/tests/unittests/test_adamax_api.py b/python/paddle/fluid/tests/unittests/test_adamax_api.py
index 78e9553a806d65433d952e41ea1bf93105773283..1b1e658defc4a61a080a7ea4a63c3c075af332d0 100644
--- a/python/paddle/fluid/tests/unittests/test_adamax_api.py
+++ b/python/paddle/fluid/tests/unittests/test_adamax_api.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_adamax_op.py b/python/paddle/fluid/tests/unittests/test_adamax_op.py
index b64327144346952bdf760dad776f9580c795b8bd..d2a80073e13bd68ce2d49fb152405f70b521afcb 100644
--- a/python/paddle/fluid/tests/unittests/test_adamax_op.py
+++ b/python/paddle/fluid/tests/unittests/test_adamax_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_adamw_op.py b/python/paddle/fluid/tests/unittests/test_adamw_op.py
index 15c8bf69bc01b4d9f2f8a8cb93c7b089344e8915..1810a4bea6121b6cf5750153d0c7ecfad9b66477 100644
--- a/python/paddle/fluid/tests/unittests/test_adamw_op.py
+++ b/python/paddle/fluid/tests/unittests/test_adamw_op.py
@@ -12,15 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import paddle
 import random
+import unittest
+from functools import partial
+
 import numpy as np
-import paddle.fluid as fluid
 from op_test import OpTest
-from functools import partial
-from paddle.framework import core
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
+from paddle.framework import core
 
 
 def adamw_step(inputs, attributes):
diff --git a/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool1d.py b/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool1d.py
index 532c2e8a45b0a936b34a3570501192a18ca62672..ab76a61017bfd9df1cb7f59d37c97b735457056b 100644
--- a/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool1d.py
+++ b/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool1d.py
@@ -12,14 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-import paddle.fluid as fluid
+
 import paddle
-import paddle.nn.functional as F
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.nn.functional as F
 
 
 def adaptive_start_index(index, input_size, output_size):
diff --git a/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool2d.py b/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool2d.py
index ef1051c377a9e5087506dd95483099e489473115..f2dccd4d63bee70e3127d99dc9b33561187f7f6f 100644
--- a/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool2d.py
+++ b/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool2d.py
@@ -14,15 +14,15 @@
 
 import os
 import unittest
+
 import numpy as np
+from test_attribute_var import UnittestBase
 
-import paddle.fluid.core as core
 import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 
-from test_attribute_var import UnittestBase
-
 
 def adaptive_start_index(index, input_size, output_size):
     return int(np.floor(index * input_size / output_size))
diff --git a/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool3d.py b/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool3d.py
index 065a27c90e80dc945951ee07072fa2b0db08cc5e..c1e6a88668816630c4906bce77376823bd97facd 100755
--- a/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool3d.py
+++ b/python/paddle/fluid/tests/unittests/test_adaptive_avg_pool3d.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
-import paddle.fluid.core as core
 import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 def adaptive_start_index(index, input_size, output_size):
diff --git a/python/paddle/fluid/tests/unittests/test_adaptive_max_pool1d.py b/python/paddle/fluid/tests/unittests/test_adaptive_max_pool1d.py
index a83ef2bfd5bae623922780f97d73d535fad10daa..245c13ff5389d7ec3209652fd10253a1d950f1ac 100644
--- a/python/paddle/fluid/tests/unittests/test_adaptive_max_pool1d.py
+++ b/python/paddle/fluid/tests/unittests/test_adaptive_max_pool1d.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
+
+import numpy as np
 from op_test import check_out_dtype
-import paddle.fluid.core as core
+
 import paddle
-import paddle.nn.functional as F
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.nn.functional as F
 
 
 def adaptive_start_index(index, input_size, output_size):
diff --git a/python/paddle/fluid/tests/unittests/test_adaptive_max_pool2d.py b/python/paddle/fluid/tests/unittests/test_adaptive_max_pool2d.py
index decbfbfa012ec4753f16b9b257b38a7b03fc9b28..af8e71a0f7102c22a34f2d02a44eb560f65a3ac3 100644
--- a/python/paddle/fluid/tests/unittests/test_adaptive_max_pool2d.py
+++ b/python/paddle/fluid/tests/unittests/test_adaptive_max_pool2d.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
-import paddle.fluid.core as core
+import numpy as np
 from op_test import check_out_dtype
+
 import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.nn.functional as F
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_adaptive_max_pool3d.py b/python/paddle/fluid/tests/unittests/test_adaptive_max_pool3d.py
index 21400576c4752cfcf7c6571e121c0c1ccddec2f7..d3f76ba39503d2b14607d01c3aec0bb368de26e3 100755
--- a/python/paddle/fluid/tests/unittests/test_adaptive_max_pool3d.py
+++ b/python/paddle/fluid/tests/unittests/test_adaptive_max_pool3d.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
-import paddle.fluid.core as core
+import numpy as np
 from op_test import check_out_dtype
+
 import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.nn.functional as F
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_add_reader_dependency.py b/python/paddle/fluid/tests/unittests/test_add_reader_dependency.py
index 1604445a873574e0f45dab9508437b6ebf6f2603..5cf3953cb8447ca6a430dedd4ff8519c209a70fc 100644
--- a/python/paddle/fluid/tests/unittests/test_add_reader_dependency.py
+++ b/python/paddle/fluid/tests/unittests/test_add_reader_dependency.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-from paddle.fluid.layer_helper import LayerHelper
+import time
 import unittest
+
 import numpy as np
-import time
+
+import paddle.fluid as fluid
+from paddle.fluid.layer_helper import LayerHelper
 
 
 def inplace_add(x, bias):
diff --git a/python/paddle/fluid/tests/unittests/test_addmm_op.py b/python/paddle/fluid/tests/unittests/test_addmm_op.py
index f101f55dc739ea346c09f09fb416eb080a070bc4..9a1385c63b5dbc39e51025a13feae6532cd3c758 100644
--- a/python/paddle/fluid/tests/unittests/test_addmm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_addmm_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_affine_grid_function.py b/python/paddle/fluid/tests/unittests/test_affine_grid_function.py
index 420b6e61ca26653dc7ba5aa04e5c8a6b3bfd3771..16a67d765f870ef162e48b3f1d683b40f0a90355 100644
--- a/python/paddle/fluid/tests/unittests/test_affine_grid_function.py
+++ b/python/paddle/fluid/tests/unittests/test_affine_grid_function.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
+import unittest
+
 import numpy as np
-from paddle import fluid
+
+import paddle
 import paddle.fluid.dygraph as dg
 import paddle.nn.functional as F
-import unittest
+from paddle import fluid
 
 
 class AffineGridTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_affine_grid_op.py b/python/paddle/fluid/tests/unittests/test_affine_grid_op.py
index 096b4fe12777dd4cbe8dd2fad4413acb816b57af..2f07a9d077cad278b1d1e6dc4172176ae5d24a34 100644
--- a/python/paddle/fluid/tests/unittests/test_affine_grid_op.py
+++ b/python/paddle/fluid/tests/unittests/test_affine_grid_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_allclose_layer.py b/python/paddle/fluid/tests/unittests/test_allclose_layer.py
index c406241c65be1d23c1a2c9adca8e05f71e73b33c..79497985b0aaaefd49fb9ab9e8717085564fe62e 100644
--- a/python/paddle/fluid/tests/unittests/test_allclose_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_allclose_layer.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
 import unittest
+
 import numpy as np
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_allclose_op.py b/python/paddle/fluid/tests/unittests/test_allclose_op.py
index 0eb47aa4441b90be0d396212c7312035a4959c31..c4cde0ec49ee99efac14c597b800332f14c2e7cf 100644
--- a/python/paddle/fluid/tests/unittests/test_allclose_op.py
+++ b/python/paddle/fluid/tests/unittests/test_allclose_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_allgather.py b/python/paddle/fluid/tests/unittests/test_allgather.py
index 89441f394cff744d6e56e529ae942c320e0c91a3..33789fb792fb169698a4fb666404ebab646dc662 100644
--- a/python/paddle/fluid/tests/unittests/test_allgather.py
+++ b/python/paddle/fluid/tests/unittests/test_allgather.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle
 
 from test_collective_base import TestDistBase
 
+import paddle
+
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_amp_check_finite_and_scale_op.py b/python/paddle/fluid/tests/unittests/test_amp_check_finite_and_scale_op.py
index 7101d3439f64298897ec5e7bb4b68a04240edd30..a840b582474f3448b0fe308c3571c88a55970736 100644
--- a/python/paddle/fluid/tests/unittests/test_amp_check_finite_and_scale_op.py
+++ b/python/paddle/fluid/tests/unittests/test_amp_check_finite_and_scale_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid.contrib.mixed_precision.amp_nn as amp_nn
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_anchor_generator_op.py b/python/paddle/fluid/tests/unittests/test_anchor_generator_op.py
index 3766dc95ab93e17989716d1eb812095edd69b6a3..063fa6cdf7d20b193a0eb416df7bffcf684804b9 100644
--- a/python/paddle/fluid/tests/unittests/test_anchor_generator_op.py
+++ b/python/paddle/fluid/tests/unittests/test_anchor_generator_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_angle_op.py b/python/paddle/fluid/tests/unittests/test_angle_op.py
index 767a274ad322482a4afba28a30cb8aaa8e2fc50b..126685b39f90b022f6e54d76613ef66f6161e68f 100644
--- a/python/paddle/fluid/tests/unittests/test_angle_op.py
+++ b/python/paddle/fluid/tests/unittests/test_angle_op.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
 import paddle
-from paddle.fluid import dygraph
 from paddle import static
+from paddle.fluid import dygraph
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_apply_pass_to_program.py b/python/paddle/fluid/tests/unittests/test_apply_pass_to_program.py
index fff492e9176738fcbe4c643b5ca90d03ac65f7bb..f2a18ea156cbe796b4943e39c7bf1e4af0b208b7 100644
--- a/python/paddle/fluid/tests/unittests/test_apply_pass_to_program.py
+++ b/python/paddle/fluid/tests/unittests/test_apply_pass_to_program.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import numpy as np
+
 import paddle
-from paddle.vision.models import resnet50
-from paddle.nn import CrossEntropyLoss
+import paddle.fluid as fluid
 from paddle.fluid.framework import _apply_pass
 from paddle.fluid.ir import apply_build_strategy
-import paddle.fluid as fluid
-import unittest
-import numpy as np
+from paddle.nn import CrossEntropyLoss
+from paddle.vision.models import resnet50
 
 
 def get_resnet50_model():
diff --git a/python/paddle/fluid/tests/unittests/test_arange.py b/python/paddle/fluid/tests/unittests/test_arange.py
index a7c5c4231d44de9d6ffab654369cae24c5eb105e..f616acb0149821043384b8323356a73c05e81a19 100644
--- a/python/paddle/fluid/tests/unittests/test_arange.py
+++ b/python/paddle/fluid/tests/unittests/test_arange.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-from paddle.fluid import core
-from paddle.static import program_guard, Program
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
+import paddle
+from paddle.fluid import core
+from paddle.static import Program, program_guard
+
 
 class TestArangeOp(OpTest):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py b/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py
index 6c9d09bbab9df103e4df8dc6dfb6594b41442fb4..603ea0d6b7a039e908356a3577f11a3d982f7f59 100644
--- a/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py
+++ b/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py
@@ -14,12 +14,14 @@
 
 import os
 import unittest
+
 import numpy as np
 from op_test import OpTest
+from test_attribute_var import UnittestBase
+
 import paddle
 import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
-from test_attribute_var import UnittestBase
 
 
 class BaseTestCase(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_arg_min_max_v2_op.py b/python/paddle/fluid/tests/unittests/test_arg_min_max_v2_op.py
index a6f3fee21095d5871287f49cbb774282d0d6e794..99dcff5db7b0bc681a2f9a35b014f70cf0d3f001 100644
--- a/python/paddle/fluid/tests/unittests/test_arg_min_max_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_arg_min_max_v2_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_argsort_op.py b/python/paddle/fluid/tests/unittests/test_argsort_op.py
index 3a0d1711af8ac7486718b596f7b83b82f540d7fe..f939462a6451b84f143503d4309a8c59fdbafa1f 100644
--- a/python/paddle/fluid/tests/unittests/test_argsort_op.py
+++ b/python/paddle/fluid/tests/unittests/test_argsort_op.py
@@ -13,14 +13,15 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import numpy as np
 import paddle.fluid.core as core
-
-from paddle.fluid.framework import Program, grad_var_name
-from paddle.fluid.executor import Executor
 from paddle.fluid.backward import append_backward
+from paddle.fluid.executor import Executor
+from paddle.fluid.framework import Program, grad_var_name
 
 np.random.seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_array_read_write_op.py b/python/paddle/fluid/tests/unittests/test_array_read_write_op.py
index e8d2579b3f2914506529199252eaf1ba0b5e32a4..907bb65cfce25cc43354a30675d9e4f484448416 100644
--- a/python/paddle/fluid/tests/unittests/test_array_read_write_op.py
+++ b/python/paddle/fluid/tests/unittests/test_array_read_write_op.py
@@ -14,15 +14,16 @@
 
 import unittest
 
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.layers as layers
-from paddle.fluid.executor import Executor
+from paddle.fluid import Program, program_guard
 from paddle.fluid.backward import append_backward
+from paddle.fluid.executor import Executor
 from paddle.fluid.framework import default_main_program
-from paddle.fluid import Program, program_guard
-import numpy as np
 
 
 def _test_read_write(x):
diff --git a/python/paddle/fluid/tests/unittests/test_ascend_trigger.py b/python/paddle/fluid/tests/unittests/test_ascend_trigger.py
index 16b38865593a6002b667d7382e59689719e6b801..917ef5606f70d6dfeabf87c1b56d7e42614fc1e5 100644
--- a/python/paddle/fluid/tests/unittests/test_ascend_trigger.py
+++ b/python/paddle/fluid/tests/unittests/test_ascend_trigger.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.fluid as fluid
-import unittest
 
 
 class TestAscendTriggerOP(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_assert_op.py b/python/paddle/fluid/tests/unittests/test_assert_op.py
index 4ce1fb9a65c520ddb045c6be160a00e7e24bfe6d..a006f9992873065246e0b7d5860a7cd4ef4bfafb 100644
--- a/python/paddle/fluid/tests/unittests/test_assert_op.py
+++ b/python/paddle/fluid/tests/unittests/test_assert_op.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import unittest
 
 
 class TestAssertOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_assign_op.py b/python/paddle/fluid/tests/unittests/test_assign_op.py
index a59d9fb6688ff113ed58b7d2a5f9b9a1116490a0..4c5921a5f2012b4a18c28927bc6d6812cbf1151d 100644
--- a/python/paddle/fluid/tests/unittests/test_assign_op.py
+++ b/python/paddle/fluid/tests/unittests/test_assign_op.py
@@ -12,18 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import op_test
-import numpy as np
 import unittest
+
+import gradient_checker
+import numpy as np
+import op_test
+from decorator_helper import prog_scope
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
-from paddle.fluid.backward import append_backward
+import paddle.fluid.core as core
 import paddle.fluid.framework as framework
-import gradient_checker
-from decorator_helper import prog_scope
 import paddle.fluid.layers as layers
+from paddle.fluid import Program, program_guard
+from paddle.fluid.backward import append_backward
 
 
 class TestAssignOp(op_test.OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_assign_pos_op.py b/python/paddle/fluid/tests/unittests/test_assign_pos_op.py
index d04fecd7b0500b323349f2b17a517b54604215e8..9478efd51a7e8cc88f70c9e9edf0928fbcdeddb4 100644
--- a/python/paddle/fluid/tests/unittests/test_assign_pos_op.py
+++ b/python/paddle/fluid/tests/unittests/test_assign_pos_op.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import op_test
-import numpy as np
 import unittest
+
+import numpy as np
+import op_test
+
 import paddle
 import paddle.fluid.core as core
 from paddle.distributed.models.moe import utils
diff --git a/python/paddle/fluid/tests/unittests/test_assign_value_op.py b/python/paddle/fluid/tests/unittests/test_assign_value_op.py
index cac321c2a27d3230b699500a8517bae65fca6003..7a5128ed2ff15968a3256ad89fc1cfe5750e3191 100644
--- a/python/paddle/fluid/tests/unittests/test_assign_value_op.py
+++ b/python/paddle/fluid/tests/unittests/test_assign_value_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
+import numpy as np
 import op_test
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.framework as framework
diff --git a/python/paddle/fluid/tests/unittests/test_async_ssa_graph_executor_mnist.py b/python/paddle/fluid/tests/unittests/test_async_ssa_graph_executor_mnist.py
index 41fc17187093ce6f63d61981173e9a9636f8d721..9caae0bea67e77110079dff36496a4c7bfede64b 100644
--- a/python/paddle/fluid/tests/unittests/test_async_ssa_graph_executor_mnist.py
+++ b/python/paddle/fluid/tests/unittests/test_async_ssa_graph_executor_mnist.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import os
+import time
 import unittest
 
 import numpy
-import time
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_atan2_op.py b/python/paddle/fluid/tests/unittests/test_atan2_op.py
index b74aeb9057004abe698fe9c97ea053fad22dca21..77ad77e3252b88dc5beb3a53e7f586e6ff3153ba 100644
--- a/python/paddle/fluid/tests/unittests/test_atan2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_atan2_op.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
 
+import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_attention_lstm_op.py b/python/paddle/fluid/tests/unittests/test_attention_lstm_op.py
index 053912005cc1b21332c5a37f27bcaa1fb9796045..b4c2d8ed2cf63fee0be5437ebf323bc9bcbaa3f6 100644
--- a/python/paddle/fluid/tests/unittests/test_attention_lstm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_attention_lstm_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from test_fusion_lstm_op import fc, ACTIVATION
+from test_fusion_lstm_op import ACTIVATION, fc
 from test_softmax_op import stable_softmax
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_attribute_var.py b/python/paddle/fluid/tests/unittests/test_attribute_var.py
index 60d202eb1b589cc42a59b867dce0c5289f9c420f..082b1970a46b22bd0cba36c41fc2535c794f00f5 100644
--- a/python/paddle/fluid/tests/unittests/test_attribute_var.py
+++ b/python/paddle/fluid/tests/unittests/test_attribute_var.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import os
-import unittest
 import tempfile
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.inference as paddle_infer
-from paddle.fluid.framework import program_guard, Program
-from paddle.fluid.framework import OpProtoHolder
-import numpy as np
+from paddle.fluid.framework import OpProtoHolder, Program, program_guard
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_auc_op.py b/python/paddle/fluid/tests/unittests/test_auc_op.py
index 0ea67b19b13fcf0e16d87febf21fd0357dc1b3d3..4a693500bcf28bfc7fb029c12abddb0146b81de5 100644
--- a/python/paddle/fluid/tests/unittests/test_auc_op.py
+++ b/python/paddle/fluid/tests/unittests/test_auc_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from paddle.fluid import metrics
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
+from paddle.fluid import metrics
 
 
 class TestAucOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_auc_single_pred_op.py b/python/paddle/fluid/tests/unittests/test_auc_single_pred_op.py
index 13482d0af3abaf3c7088d1c999f30cd2513f6d10..1abdc6ef40147383382bce24b3ae6911e13d6f08 100644
--- a/python/paddle/fluid/tests/unittests/test_auc_single_pred_op.py
+++ b/python/paddle/fluid/tests/unittests/test_auc_single_pred_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 from paddle.fluid import metrics
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_auto_growth_gpu_memory_limit.py b/python/paddle/fluid/tests/unittests/test_auto_growth_gpu_memory_limit.py
index 7f4f6c78c194556793c1608e4452ce05491b2331..2bab9ad2011f25f8480ad4ff8e4536776124e1a0 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_growth_gpu_memory_limit.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_growth_gpu_memory_limit.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest
+
 import numpy as np
 
+import paddle.fluid as fluid
+
 fluid.core.globals()['FLAGS_allocator_strategy'] = 'auto_growth'
 
 if fluid.is_compiled_with_cuda():
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_cluster.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_cluster.py
index a632d29f6915be718e19db586ee84c6461a4b340..c2a116abc058040ae32ab142d548972cb9ec0dee 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_cluster.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_cluster.py
@@ -12,13 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import json
+import os
 import tempfile
 import unittest
-import os
-import json
-from paddle.distributed.auto_parallel.cluster import Cluster
-from paddle.distributed.auto_parallel.cluster import DeviceType
-from paddle.distributed.auto_parallel.cluster import LinkType
+
+from paddle.distributed.auto_parallel.cluster import (
+    Cluster,
+    DeviceType,
+    LinkType,
+)
 
 cluster_json = """
 {
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_completion.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_completion.py
index c6af2b0a6a2f387100db45750c1b1f9749c00a96..113f32d31e12a37afd0e30cfaee5584a955e7a2d 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_completion.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_completion.py
@@ -17,14 +17,14 @@ import unittest.mock
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
-import paddle.utils as utils
+import paddle.static as static
 import paddle.tensor as tensor
-from paddle.fluid import layers
-from paddle.distributed.fleet import auto
+import paddle.utils as utils
 from paddle.distributed.auto_parallel.completion import Completer
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
+from paddle.distributed.fleet import auto
+from paddle.fluid import layers
 
 paddle.enable_static()
 _global_parallel_strategy = None
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_completion_gpt.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_completion_gpt.py
index 0febac998b32c6a01540400acef4ba69c5b8ceaa..45dd9bb66ee064fc63db1d951bfd5a0d714b7d20 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_completion_gpt.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_completion_gpt.py
@@ -18,14 +18,14 @@ import unittest
 import paddle
 import paddle.nn as nn
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.tensor as tensor
 import paddle.utils as utils
-from paddle.fluid import layers
-from paddle.nn.layer.transformer import _convert_param_attr_to_list
-import paddle.static as static
-from paddle.distributed.fleet import auto
 from paddle.distributed.auto_parallel.completion import Completer
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
+from paddle.distributed.fleet import auto
+from paddle.fluid import layers
+from paddle.nn.layer.transformer import _convert_param_attr_to_list
 
 paddle.enable_static()
 _global_parallel_strategy = None
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_cost_model.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_cost_model.py
index e474c91355ead4b1d34bdd0a2203fda095c3690e..73cc48f272232484f040aaa568ae042e80d7e24c 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_cost_model.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_cost_model.py
@@ -15,19 +15,19 @@
 import unittest
 
 import paddle
+import paddle.fluid.core as core
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-from paddle.distributed.fleet import auto
+from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.completion import Completer
+from paddle.distributed.auto_parallel.cost_model import estimate_cost
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed import fleet
-from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
+from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.reshard import Resharder
-from paddle.distributed.auto_parallel.cost_model import estimate_cost
-import paddle.fluid.core as core
+from paddle.distributed.fleet import auto
 
 paddle.enable_static()
 _global_parallel_strategy = "dp_mp_pp"
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_dist_tensor.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_dist_tensor.py
index e1f504602398e654d032e67bbe87866e2e1e7568..900b44d18f18f0e0abe72cb888f82ffe32ced217 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_dist_tensor.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_dist_tensor.py
@@ -15,19 +15,20 @@
 import copy
 import unittest
 
+import test_auto_parallel_reshard
+from test_auto_parallel_reshard import mlp_forward
+
 import paddle
-from paddle.distributed.fleet import auto
-from paddle.distributed.auto_parallel.completion import Completer
 from paddle.distributed import fleet
-from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
-from paddle.distributed.auto_parallel.partitioner import Partitioner
-from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed.auto_parallel.dist_tensor import DistributedTensor
+from paddle.distributed.auto_parallel.completion import Completer
 from paddle.distributed.auto_parallel.dist_attribute import (
     TensorDistributedAttribute,
 )
-import test_auto_parallel_reshard
-from test_auto_parallel_reshard import mlp_forward
+from paddle.distributed.auto_parallel.dist_context import DistributedContext
+from paddle.distributed.auto_parallel.dist_tensor import DistributedTensor
+from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
+from paddle.distributed.auto_parallel.partitioner import Partitioner
+from paddle.distributed.fleet import auto
 
 
 def get_dist_prog(
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_graph.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_graph.py
index 2e43bf6f928cb9fa15b27b35f40e04493cc865ad..ac75e0a9570b4f89b8e394b2bac48a7c5294e8be 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_graph.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_graph.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from paddle.distributed.auto_parallel.graph import Graph
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_mapper.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_mapper.py
index 80e4e66d2137f2fb7726174ad39fdd78dff8b2d5..946b8959d0b4d397a451cb8a14bb7a8fa0ca11fb 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_mapper.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_mapper.py
@@ -12,33 +12,34 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import json
+import os
 import tempfile
 import unittest
-import os
-import json
+
 import numpy as np
 
 import paddle
-import paddle.nn as nn
 import paddle.fluid as fluid
+import paddle.nn as nn
 import paddle.nn.functional as F
-import paddle.utils as utils
 import paddle.static as static
-from paddle.fluid import core
-from paddle.fluid import layers
-from paddle.fluid.initializer import NumpyArrayInitializer
+import paddle.utils as utils
 from paddle.distributed import fleet
-
-from paddle.distributed.fleet import auto
+from paddle.distributed.auto_parallel.cluster import Cluster
 from paddle.distributed.auto_parallel.completion import Completer
-from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
+from paddle.distributed.auto_parallel.mapper import (
+    get_comm_volume,
+    get_dtype_bytes,
+    mapping,
+)
+from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
 from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.reshard import Resharder
-from paddle.distributed.auto_parallel.cluster import Cluster
-from paddle.distributed.auto_parallel.mapper import mapping
-from paddle.distributed.auto_parallel.mapper import get_dtype_bytes
-from paddle.distributed.auto_parallel.mapper import get_comm_volume
+from paddle.distributed.fleet import auto
+from paddle.fluid import core, layers
+from paddle.fluid.initializer import NumpyArrayInitializer
 
 if os.getenv("CUDA_VISIBLE_DEVICES") is not None:
     os.environ["CUDA_VISIBLE_DEVICES"] = ""
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner.py
index 78706d20d45e57d9e4c4c4db10f7e99dced14dd9..f745926f5b39b2f1e37a1864231299a4bb2c2eb1 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner.py
@@ -17,18 +17,18 @@ import unittest.mock
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
-import paddle.utils as utils
+import paddle.static as static
 import paddle.tensor as tensor
-from paddle.fluid import layers
-from paddle.distributed.fleet import auto
+import paddle.utils as utils
+from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.completion import Completer
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.partitioner import Partitioner
-from paddle.distributed.auto_parallel.utils import _get_comm_group
 from paddle.distributed.auto_parallel.process_group import new_process_group
+from paddle.distributed.auto_parallel.utils import _get_comm_group
+from paddle.distributed.fleet import auto
+from paddle.fluid import layers
 
 paddle.enable_static()
 _global_parallel_strategy = None
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner_gpt.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner_gpt.py
index b65a2351244b67d9800675375ebaf738935bcb4e..cefc98cdb5ff4a9701591d33600c620363dcdd9a 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner_gpt.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_partitioner_gpt.py
@@ -18,17 +18,17 @@ import unittest
 import paddle
 import paddle.nn as nn
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.tensor as tensor
 import paddle.utils as utils
-from paddle.fluid import layers
-from paddle.nn.layer.transformer import _convert_param_attr_to_list
-import paddle.static as static
-from paddle.distributed.fleet import auto
 from paddle.distributed.auto_parallel.completion import Completer
-from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
-from paddle.distributed.auto_parallel.utils import _get_comm_group
+from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.process_group import new_process_group
+from paddle.distributed.auto_parallel.utils import _get_comm_group
+from paddle.distributed.fleet import auto
+from paddle.fluid import layers
+from paddle.nn.layer.transformer import _convert_param_attr_to_list
 
 paddle.enable_static()
 _global_parallel_strategy = None
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard.py
index c8ab71ed3ec6978eb24afd3687ba899f5be6af3f..d3c5fcfb95d190af8321ff7afbeb3b05fc5e62dc 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard.py
@@ -16,20 +16,20 @@ import unittest
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-from paddle.distributed.fleet import auto
+from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.completion import Completer
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
 from paddle.distributed.auto_parallel.partitioner import Partitioner
-from paddle.distributed.auto_parallel.reshard import Resharder
 from paddle.distributed.auto_parallel.process_group import (
-    _g_process_group_map,
     ProcessGroup,
+    _g_process_group_map,
 )
+from paddle.distributed.auto_parallel.reshard import Resharder
+from paddle.distributed.fleet import auto
 
 paddle.enable_static()
 _global_parallel_strategy = None
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_dpmppp.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_dpmppp.py
index 9212056a41268b2197ec0962c6472bf362a839b5..8fc9003379211b8a2be9f5fbf67889ad9a48119c 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_dpmppp.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_dpmppp.py
@@ -16,18 +16,18 @@ import unittest
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-from paddle.distributed.fleet import auto
+from paddle.distributed import fleet
+from paddle.distributed.auto_parallel.cluster import Cluster
 from paddle.distributed.auto_parallel.completion import Completer
+from paddle.distributed.auto_parallel.cost import CostEstimator
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
 from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.reshard import Resharder
-from paddle.distributed.auto_parallel.cost import CostEstimator
-from paddle.distributed.auto_parallel.cluster import Cluster
+from paddle.distributed.fleet import auto
 
 paddle.enable_static()
 _global_parallel_strategy = "dp_mp_pp"
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_mppp.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_mppp.py
index 42a2e6ff798ffb9b3b38387053822ab67c660307..e3c284bd56933a6a29435a0e1c337c39cda4b83d 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_mppp.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_mppp.py
@@ -16,18 +16,18 @@ import unittest
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-from paddle.distributed.fleet import auto
+from paddle.distributed import fleet
+from paddle.distributed.auto_parallel.cluster import Cluster
 from paddle.distributed.auto_parallel.completion import Completer
+from paddle.distributed.auto_parallel.cost import CostEstimator
 from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.parallelizer import AutoParallelizer
 from paddle.distributed.auto_parallel.partitioner import Partitioner
 from paddle.distributed.auto_parallel.reshard import Resharder
-from paddle.distributed.auto_parallel.cost import CostEstimator
-from paddle.distributed.auto_parallel.cluster import Cluster
+from paddle.distributed.fleet import auto
 
 paddle.enable_static()
 _global_parallel_strategy = "mp_pp"
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_serial.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_serial.py
index 5c55ced4f292c7ef2855ddf412cdbfd3cf602040..c346360cbc0491c17604eea8d9d1a726b3e73f1c 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_serial.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_reshard_serial.py
@@ -12,23 +12,22 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-
 import os
+import unittest
 
 if os.getenv("CUDA_VISIBLE_DEVICES", None) is None:
     os.environ["CUDA_VISIBLE_DEVICES"] = '0'
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-from paddle.distributed.fleet import auto
+from paddle.distributed import fleet
 from paddle.distributed.auto_parallel.dist_context import (
     get_default_distributed_context,
 )
-from paddle.distributed import fleet
+from paddle.distributed.fleet import auto
 
 paddle.enable_static()
 _global_parallel_strategy = None
diff --git a/python/paddle/fluid/tests/unittests/test_auto_parallel_searcher.py b/python/paddle/fluid/tests/unittests/test_auto_parallel_searcher.py
index 4e90dabd3933f919f451268c0d82cb6aa7e2a5ca..0c965ff70bda1244617b3998d98769817a125fa3 100755
--- a/python/paddle/fluid/tests/unittests/test_auto_parallel_searcher.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_parallel_searcher.py
@@ -16,24 +16,20 @@ import unittest
 
 import paddle
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-from paddle.distributed.fleet import auto
-from paddle.distributed.auto_parallel.planner import PlanSpace
-from paddle.distributed.auto_parallel.dist_context import DistributedContext
-from paddle.distributed.auto_parallel.dist_attribute import (
-    TensorDistributedAttribute,
-)
 from paddle.distributed.auto_parallel.dist_attribute import (
     OperatorDistributedAttribute,
+    TensorDistributedAttribute,
 )
+from paddle.distributed.auto_parallel.dist_context import DistributedContext
+from paddle.distributed.auto_parallel.planner import PlanSpace
 from paddle.distributed.auto_parallel.utils import (
     update_op_dims_mapping_by_default_dist_impl,
-)
-from paddle.distributed.auto_parallel.utils import (
     update_op_dims_mapping_by_elementwise_like_dist_impl,
 )
+from paddle.distributed.fleet import auto
 
 paddle.enable_static()
 
@@ -183,13 +179,11 @@ class TestMLPSearcher(unittest.TestCase):
         set_default_dist_attr(train_program, dist_context, global_process_mesh)
         ops = train_program.global_block().ops
         vars = train_program.global_block().vars
+        from paddle.distributed.auto_parallel.dist_op import DistributedOperator
         from paddle.distributed.auto_parallel.operators.common import (
             get_distributed_operator_impl_container,
-        )
-        from paddle.distributed.auto_parallel.operators.common import (
             is_elementwise_op,
         )
-        from paddle.distributed.auto_parallel.dist_op import DistributedOperator
 
         for op in ops:
             dist_op_impl_container = get_distributed_operator_impl_container(
diff --git a/python/paddle/fluid/tests/unittests/test_auto_search_dist_matmul_op.py b/python/paddle/fluid/tests/unittests/test_auto_search_dist_matmul_op.py
index 555602a9e23ee71057eb70c1fee589e5f4a7dbaa..a9430ea4aa0c9c97e66db9777fb80cae0b14ec96 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_search_dist_matmul_op.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_search_dist_matmul_op.py
@@ -14,19 +14,19 @@
 import unittest
 
 import paddle
+import paddle.fluid.core as core
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-import paddle.fluid.core as core
-from paddle.fluid import layers
-from paddle.distributed.auto_parallel.operators.common import (
-    get_distributed_operator_impl_container,
-)
 from paddle.distributed.auto_parallel.dist_attribute import (
     OperatorDistributedAttribute,
 )
 from paddle.distributed.auto_parallel.dist_op import DistributedOperator
+from paddle.distributed.auto_parallel.operators.common import (
+    get_distributed_operator_impl_container,
+)
+from paddle.fluid import layers
 
 paddle.enable_static()
 device = "gpu" if core.is_compiled_with_cuda() else "cpu"
diff --git a/python/paddle/fluid/tests/unittests/test_auto_search_dist_op.py b/python/paddle/fluid/tests/unittests/test_auto_search_dist_op.py
index 2c839d835bfbd496ca9dd70915d4e41593bec893..0c36aa2460454a8fae668b109b8c4e28f7544b9b 100644
--- a/python/paddle/fluid/tests/unittests/test_auto_search_dist_op.py
+++ b/python/paddle/fluid/tests/unittests/test_auto_search_dist_op.py
@@ -14,19 +14,19 @@
 import unittest
 
 import paddle
+import paddle.fluid.core as core
 import paddle.nn as nn
-import paddle.static as static
 import paddle.nn.functional as F
+import paddle.static as static
 import paddle.utils as utils
-import paddle.fluid.core as core
-from paddle.fluid import layers
-from paddle.distributed.auto_parallel.operators.common import (
-    get_distributed_operator_impl_container,
-)
 from paddle.distributed.auto_parallel.dist_attribute import (
     OperatorDistributedAttribute,
 )
 from paddle.distributed.auto_parallel.dist_op import DistributedOperator
+from paddle.distributed.auto_parallel.operators.common import (
+    get_distributed_operator_impl_container,
+)
+from paddle.fluid import layers
 
 paddle.enable_static()
 device = "gpu" if core.is_compiled_with_cuda() else "cpu"
diff --git a/python/paddle/fluid/tests/unittests/test_avoid_twice_initialization.py b/python/paddle/fluid/tests/unittests/test_avoid_twice_initialization.py
index 43a2d08731d1151c75f4312995547f5cddce0516..77062eee5a376b891d82457df32dffa1af8894d4 100644
--- a/python/paddle/fluid/tests/unittests/test_avoid_twice_initialization.py
+++ b/python/paddle/fluid/tests/unittests/test_avoid_twice_initialization.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_backward.py b/python/paddle/fluid/tests/unittests/test_backward.py
index 98c2c05e60c58c4bf71de27b526149684a4fcd4c..9ba1cf884a1f30e1fdf070f4fd94f22114309f2d 100644
--- a/python/paddle/fluid/tests/unittests/test_backward.py
+++ b/python/paddle/fluid/tests/unittests/test_backward.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
-import paddle.static as static
-import paddle
 
 import numpy as np
 
+import paddle
+import paddle.fluid as fluid
+import paddle.static as static
+
 
 class BackwardNet:
     """
diff --git a/python/paddle/fluid/tests/unittests/test_backward_infer_var_data_type_shape.py b/python/paddle/fluid/tests/unittests/test_backward_infer_var_data_type_shape.py
index 2a16d6d57e3ba404e9d63b18c5b95cbc64e387ba..add2b429ba18355963cdeb311084e3d96f117dc9 100644
--- a/python/paddle/fluid/tests/unittests/test_backward_infer_var_data_type_shape.py
+++ b/python/paddle/fluid/tests/unittests/test_backward_infer_var_data_type_shape.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+import warnings
+
 import numpy as np
+
 import paddle
-import warnings
+import paddle.fluid as fluid
 
 
 class TestBackwardInferVarDataTypeShape(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_base_layer.py b/python/paddle/fluid/tests/unittests/test_base_layer.py
index 832c4488ccd720bf850346ecc1d934c7ac1822d3..4ec5ddd9dd5d030852da6595fce92c903678922c 100644
--- a/python/paddle/fluid/tests/unittests/test_base_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_base_layer.py
@@ -13,14 +13,19 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid.dygraph import to_variable
-from paddle.fluid.framework import ParamBase, EagerParamBase
+from paddle.fluid.framework import (
+    EagerParamBase,
+    ParamBase,
+    _test_eager_guard,
+    in_dygraph_mode,
+)
 from paddle.jit import ProgramTranslator
-from paddle.fluid.framework import _test_eager_guard, in_dygraph_mode
 
 
 class L1(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_basic_gru_api.py b/python/paddle/fluid/tests/unittests/test_basic_gru_api.py
index 339323110a116b1aad27798620cc9e5c22f9e592..17ffed2629e0e1afe3ffffbea19bc04fe5edaf19 100644
--- a/python/paddle/fluid/tests/unittests/test_basic_gru_api.py
+++ b/python/paddle/fluid/tests/unittests/test_basic_gru_api.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy
+import numpy as np
+
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
+import paddle.fluid.layers as layers
+from paddle.fluid import framework
 from paddle.fluid.contrib.layers import basic_gru
 from paddle.fluid.executor import Executor
-from paddle.fluid import framework
-
-import numpy as np
 
 np.set_seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_basic_gru_unit_op.py b/python/paddle/fluid/tests/unittests/test_basic_gru_unit_op.py
index 660aa184f578802db6a49439e57fe01200163a0f..152c76bf6fa014d0b93bfe5e5c07be48a9d41385 100644
--- a/python/paddle/fluid/tests/unittests/test_basic_gru_unit_op.py
+++ b/python/paddle/fluid/tests/unittests/test_basic_gru_unit_op.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy
+import numpy as np
+
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
+import paddle.fluid.layers as layers
+from paddle.fluid import framework
 from paddle.fluid.contrib.layers import BasicGRUUnit
 from paddle.fluid.executor import Executor
-from paddle.fluid import framework
-
-import numpy as np
 
 np.set_seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_basic_lstm_api.py b/python/paddle/fluid/tests/unittests/test_basic_lstm_api.py
index befc7e2c5ffa5c9c93e912b3e4a86d5ab3afc826..ba7132cfea99d0a3c6053c12a1d7c973220d7e6f 100644
--- a/python/paddle/fluid/tests/unittests/test_basic_lstm_api.py
+++ b/python/paddle/fluid/tests/unittests/test_basic_lstm_api.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy
+import numpy as np
+
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
+import paddle.fluid.layers as layers
+from paddle.fluid import framework
 from paddle.fluid.contrib.layers import basic_lstm
 from paddle.fluid.executor import Executor
-from paddle.fluid import framework
-
-import numpy as np
 
 np.set_seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_basic_lstm_unit_op.py b/python/paddle/fluid/tests/unittests/test_basic_lstm_unit_op.py
index cf32b95d76f36952317fafd5fffc8800cd1c4ef6..0b17e611b6806920c354f7960f199d4f78b5eb44 100644
--- a/python/paddle/fluid/tests/unittests/test_basic_lstm_unit_op.py
+++ b/python/paddle/fluid/tests/unittests/test_basic_lstm_unit_op.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy
+import numpy as np
+
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
+import paddle.fluid.layers as layers
+from paddle.fluid import framework
 from paddle.fluid.contrib.layers import BasicLSTMUnit
 from paddle.fluid.executor import Executor
-from paddle.fluid import framework
-
-import numpy as np
 
 np.set_seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_basic_rnn_name.py b/python/paddle/fluid/tests/unittests/test_basic_rnn_name.py
index 17bec037e842b9d91ec0c9c6ee904e247f34af1a..c01a266bdbb45b2e98c6ce91d004915773ed07cc 100644
--- a/python/paddle/fluid/tests/unittests/test_basic_rnn_name.py
+++ b/python/paddle/fluid/tests/unittests/test_basic_rnn_name.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
+from test_imperative_base import new_program_scope
+
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
 from paddle.fluid.contrib.layers import basic_gru, basic_lstm
-from test_imperative_base import new_program_scope
 
 
 class TestBasicGRUApiName(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_batch_fc_op.py b/python/paddle/fluid/tests/unittests/test_batch_fc_op.py
index 2414514b2bd25037ad823fcc612b5ef9d8432981..80818ae0c189a49860a6ec8e60b715b57095d968 100644
--- a/python/paddle/fluid/tests/unittests/test_batch_fc_op.py
+++ b/python/paddle/fluid/tests/unittests/test_batch_fc_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from op_test import OpTest
+
 import paddle.fluid.core as core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_batch_norm_op.py b/python/paddle/fluid/tests/unittests/test_batch_norm_op.py
index ccd7de2c3171fe3919f5fb3b9b67f184a796edf3..9c3f04b1360c03e819883dbfa6ff7a745b4772cf 100644
--- a/python/paddle/fluid/tests/unittests/test_batch_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_batch_norm_op.py
@@ -14,15 +14,16 @@
 
 import os
 import unittest
+
 import numpy as np
-import paddle
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
-import paddle.fluid as fluid
 from op_test import OpTest, _set_use_system_allocator
-from paddle.fluid.framework import grad_var_name
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
+from paddle.fluid.framework import grad_var_name
+from paddle.fluid.op import Operator
 
 _set_use_system_allocator(True)
 
diff --git a/python/paddle/fluid/tests/unittests/test_batch_norm_op_v2.py b/python/paddle/fluid/tests/unittests/test_batch_norm_op_v2.py
index 614e058c6deadb5e4390bd8b037cd86e7a6b26c8..7056c34487bdbd135da6961c5c5b1b0faad12071 100644
--- a/python/paddle/fluid/tests/unittests/test_batch_norm_op_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_batch_norm_op_v2.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-import paddle.fluid as fluid
-from paddle.fluid.framework import _test_eager_guard
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
-import paddle
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestBatchNorm(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_batch_sampler.py b/python/paddle/fluid/tests/unittests/test_batch_sampler.py
index a848898c53f89bf6ad35a36080ff224aa222ec34..72ea1577beb53adaddc4ba5c450ae0dab1897b7e 100644
--- a/python/paddle/fluid/tests/unittests/test_batch_sampler.py
+++ b/python/paddle/fluid/tests/unittests/test_batch_sampler.py
@@ -15,12 +15,13 @@
 import unittest
 
 import numpy as np
+
 from paddle.io import (
     BatchSampler,
     Dataset,
+    RandomSampler,
     Sampler,
     SequenceSampler,
-    RandomSampler,
     WeightedRandomSampler,
 )
 
diff --git a/python/paddle/fluid/tests/unittests/test_bce_loss.py b/python/paddle/fluid/tests/unittests/test_bce_loss.py
index c77196c1d0d94ef1ad8ecd4e4b414b30997a89d3..d60c648535cd5810f4717cc91b67f13d2c31d5a3 100644
--- a/python/paddle/fluid/tests/unittests/test_bce_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_bce_loss.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import numpy as np
 import unittest
+
+import numpy as np
 from op_test import OpTest
 
+import paddle
+import paddle.fluid as fluid
+
 
 def test_static_layer(
     place, input_np, label_np, reduction='mean', weight_np=None
diff --git a/python/paddle/fluid/tests/unittests/test_bce_with_logits_loss.py b/python/paddle/fluid/tests/unittests/test_bce_with_logits_loss.py
index 8d921215bfa322e7a19eecb05fd2b1c2fc1c5098..788c7418f7e02099f0ccd742647dd7f2035f087e 100644
--- a/python/paddle/fluid/tests/unittests/test_bce_with_logits_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_bce_with_logits_loss.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import numpy as np
-import unittest
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_beam_search_decode_op.py b/python/paddle/fluid/tests/unittests/test_beam_search_decode_op.py
index ee1e2fd64585f667d8b683fbf913bfb4a1df3ad1..c69d8fac11f3c9674a200a2b59c7cb9ecd5ce17c 100644
--- a/python/paddle/fluid/tests/unittests/test_beam_search_decode_op.py
+++ b/python/paddle/fluid/tests/unittests/test_beam_search_decode_op.py
@@ -15,10 +15,11 @@
 import unittest
 
 import numpy as np
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
+
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid.framework import Program, program_guard
+from paddle.fluid.op import Operator
 
 
 class TestBeamSearchDecodeOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_beam_search_op.py b/python/paddle/fluid/tests/unittests/test_beam_search_op.py
index 60989a0b60880eb298e11ac9e6966ec18cb2a17b..0d44764e2da1bfb8a9974e9c690a78c171716c72 100644
--- a/python/paddle/fluid/tests/unittests/test_beam_search_op.py
+++ b/python/paddle/fluid/tests/unittests/test_beam_search_op.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.fluid.op import Operator
-import paddle.fluid.core as core
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid.framework import Program, program_guard
-import paddle
+from paddle.fluid.op import Operator
 
 
 def create_tensor(scope, name, np_data):
diff --git a/python/paddle/fluid/tests/unittests/test_bernoulli_op.py b/python/paddle/fluid/tests/unittests/test_bernoulli_op.py
index 027afdb177a29e8db92a29c5d66fc59b336272a3..d00e804f26b2f28d947812735837defd6d008bdb 100644
--- a/python/paddle/fluid/tests/unittests/test_bernoulli_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bernoulli_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle
-from op_test import OpTest
+
 import numpy as np
+from op_test import OpTest
+
+import paddle
 
 
 def output_hist(out):
diff --git a/python/paddle/fluid/tests/unittests/test_bfgs.py b/python/paddle/fluid/tests/unittests/test_bfgs.py
index 07b15d3aefca7f980d14fc54a90cd47a1b4b97e3..0e02f18ad065d122993188ac6b0f357140901a35 100644
--- a/python/paddle/fluid/tests/unittests/test_bfgs.py
+++ b/python/paddle/fluid/tests/unittests/test_bfgs.py
@@ -18,9 +18,8 @@ import numpy as np
 
 import paddle
 import paddle.nn.functional as F
-
-from paddle.incubate.optimizer.functional.bfgs import minimize_bfgs
 from paddle.fluid.framework import _test_eager_guard
+from paddle.incubate.optimizer.functional.bfgs import minimize_bfgs
 
 np.random.seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_bfloat16_embedding.py b/python/paddle/fluid/tests/unittests/test_bfloat16_embedding.py
index e86c45cf5412b4f4bd9d948e434fa31e50f1154f..45084add53acb7a1f361f0081ffb6bda8a631cc5 100644
--- a/python/paddle/fluid/tests/unittests/test_bfloat16_embedding.py
+++ b/python/paddle/fluid/tests/unittests/test_bfloat16_embedding.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import numpy as np
 import unittest
-import paddle.nn.functional as F
+
+import numpy as np
 from test_sparse_attention_op import get_cuda_version
 
+import paddle
+import paddle.nn.functional as F
+
 
 class BF16EmbeddingTest(unittest.TestCase):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_bicubic_interp_op.py b/python/paddle/fluid/tests/unittests/test_bicubic_interp_op.py
index 886441429c25dd98d5206a4437ce004f3b981283..b5d1a7d0dfd5c0cffe66a7e17abfd5930a62aa54 100644
--- a/python/paddle/fluid/tests/unittests/test_bicubic_interp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bicubic_interp_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 from paddle.nn.functional import interpolate
 
diff --git a/python/paddle/fluid/tests/unittests/test_bicubic_interp_v2_op.py b/python/paddle/fluid/tests/unittests/test_bicubic_interp_v2_op.py
index 2bfe40abe53cbd8259cd81aaffa2b8f5092c4be3..7046d78fffb180cf3f2eb9c193bd6aec17e34e0a 100644
--- a/python/paddle/fluid/tests/unittests/test_bicubic_interp_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bicubic_interp_v2_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
 from paddle.nn.functional import interpolate
diff --git a/python/paddle/fluid/tests/unittests/test_bilateral_slice_op.py b/python/paddle/fluid/tests/unittests/test_bilateral_slice_op.py
index db0b8c182de9213f5707d7697cf6ee3c5236cf07..d8aa8baec6b829fe2e8bf555a4ed669498897ddf 100644
--- a/python/paddle/fluid/tests/unittests/test_bilateral_slice_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bilateral_slice_op.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
-import math
 
 
 class Gsz:
diff --git a/python/paddle/fluid/tests/unittests/test_bilinear_api.py b/python/paddle/fluid/tests/unittests/test_bilinear_api.py
index dcdb03d05bad90ebd4721d55446df5140a69479c..925a45f3bada424bf14bcf440e8c42115f7eaf44 100644
--- a/python/paddle/fluid/tests/unittests/test_bilinear_api.py
+++ b/python/paddle/fluid/tests/unittests/test_bilinear_api.py
@@ -14,10 +14,11 @@
 
 import unittest
 
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import numpy as np
 
 
 class TestBilinearAPI(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_bilinear_interp_op.py b/python/paddle/fluid/tests/unittests/test_bilinear_interp_op.py
index b281d30a2221f2f07aad061df939620fb2659425..5381df947acc021901d876d7e83f9754877fe1db 100755
--- a/python/paddle/fluid/tests/unittests/test_bilinear_interp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bilinear_interp_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.fluid.core as core
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_bilinear_interp_v2_op.py b/python/paddle/fluid/tests/unittests/test_bilinear_interp_v2_op.py
index 1a3786dbdd5d5495d11d39a139cdacdf45246db1..ff5a0a707b87aa7747bfb74d49deb72d5adb5be2 100755
--- a/python/paddle/fluid/tests/unittests/test_bilinear_interp_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bilinear_interp_v2_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.fluid.core as core
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.nn.functional import interpolate
-import paddle
 
 
 def bilinear_interp_test(
diff --git a/python/paddle/fluid/tests/unittests/test_bilinear_tensor_product_op.py b/python/paddle/fluid/tests/unittests/test_bilinear_tensor_product_op.py
index 79ef2ffabbc1c43523013ada3f44d302ea04f194..74910a4a87c15e96b9260fab073764adcff6a68d 100644
--- a/python/paddle/fluid/tests/unittests/test_bilinear_tensor_product_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bilinear_tensor_product_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
 from op_test import OpTest
+
 import paddle
+import paddle.fluid as fluid
 
 
 class TestDygraphBilinearTensorProductAPIError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_bincount_op.py b/python/paddle/fluid/tests/unittests/test_bincount_op.py
index c5e39f1b13fa34b05868582c174395f8b46e1ae9..1c7ce50b2fd22b3da8e1ac761aa716e7a98a7d29 100644
--- a/python/paddle/fluid/tests/unittests/test_bincount_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bincount_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import os
-import unittest
 import tempfile
+import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
-from op_test import OpTest
 import paddle.inference as paddle_infer
 from paddle.fluid.framework import in_dygraph_mode
 
diff --git a/python/paddle/fluid/tests/unittests/test_bipartite_match_op.py b/python/paddle/fluid/tests/unittests/test_bipartite_match_op.py
index 0412c04d8ca0d33df554b6bd68e56193a00fa6e6..0c2664007df86c7d3444de233c682620b7ae22d7 100644
--- a/python/paddle/fluid/tests/unittests/test_bipartite_match_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bipartite_match_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_bitwise_op.py b/python/paddle/fluid/tests/unittests/test_bitwise_op.py
index e5d888b329a8cb3443004d543a572ae31a2f8e70..fa4e3bc4a64aa9f1aafa197b41f25e5376bc97a7 100644
--- a/python/paddle/fluid/tests/unittests/test_bitwise_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bitwise_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
+
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_bmm_op.py b/python/paddle/fluid/tests/unittests/test_bmm_op.py
index 5c99a2e62cc59bdf71039a18078abf89872145a1..5269f27ccdaa3990cd5a425286bf56947c0eb4cc 100644
--- a/python/paddle/fluid/tests/unittests/test_bmm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bmm_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_box_clip_op.py b/python/paddle/fluid/tests/unittests/test_box_clip_op.py
index 2ee356976f6c62f4ade79f042f8146e14b06e653..a114f30a0620d16c4df9dd246948f37e08b5ff0a 100644
--- a/python/paddle/fluid/tests/unittests/test_box_clip_op.py
+++ b/python/paddle/fluid/tests/unittests/test_box_clip_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_box_coder_op.py b/python/paddle/fluid/tests/unittests/test_box_coder_op.py
index fd3106f9c6f8493f78b8939c738248be430724ff..6fea1dc93852385547060c5dc4245becefe035f7 100644
--- a/python/paddle/fluid/tests/unittests/test_box_coder_op.py
+++ b/python/paddle/fluid/tests/unittests/test_box_coder_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_box_decoder_and_assign_op.py b/python/paddle/fluid/tests/unittests/test_box_decoder_and_assign_op.py
index 0b826e362e7bd061dbb91b257a51c76f27b32f0e..52caf2ad92db11921734ac3d7d65811b7511ad35 100644
--- a/python/paddle/fluid/tests/unittests/test_box_decoder_and_assign_op.py
+++ b/python/paddle/fluid/tests/unittests/test_box_decoder_and_assign_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_boxps.py b/python/paddle/fluid/tests/unittests/test_boxps.py
index a51f86a7b2b725994627e7ef5c1fb9c70f899b52..4f2d3ee138a77573fad6a64ae53c99f0bc18935a 100644
--- a/python/paddle/fluid/tests/unittests/test_boxps.py
+++ b/python/paddle/fluid/tests/unittests/test_boxps.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import unittest
 from paddle.fluid.layers.nn import _pull_box_sparse
 from paddle.fluid.transpiler import collective
 
diff --git a/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py b/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py
index 5f8953aaea3631a9ec5cc08b718a2fa534655180..5bd6dbb2fda5b648dc8ada5b2a0066f9eb34b5fc 100644
--- a/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, randomize_probability
 
diff --git a/python/paddle/fluid/tests/unittests/test_broadcast_error.py b/python/paddle/fluid/tests/unittests/test_broadcast_error.py
index 517de67fd6dddf1d0a74df6ffed659720862b20c..05d544cbab81e3696f25a75460d25acb83eb9f85 100644
--- a/python/paddle/fluid/tests/unittests/test_broadcast_error.py
+++ b/python/paddle/fluid/tests/unittests/test_broadcast_error.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid.core as core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_broadcast_shape.py b/python/paddle/fluid/tests/unittests/test_broadcast_shape.py
index 1afb046b68b467ac469e8822c677591deed91a23..028e950821a24e05803fcffc6fb891d3f28d855e 100644
--- a/python/paddle/fluid/tests/unittests/test_broadcast_shape.py
+++ b/python/paddle/fluid/tests/unittests/test_broadcast_shape.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_broadcast_tensors_op.py b/python/paddle/fluid/tests/unittests/test_broadcast_tensors_op.py
index 3872dadebd82d9cbdd36680a01cc68a9f98e8f10..8a1b6a52a2baa92412b4830df600aaef4a795f4a 100644
--- a/python/paddle/fluid/tests/unittests/test_broadcast_tensors_op.py
+++ b/python/paddle/fluid/tests/unittests/test_broadcast_tensors_op.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import random
 import unittest
+
 import numpy as np
-import paddle
-import paddle.fluid.core as core
 from op_test import OpTest
 
-import random
+import paddle
+import paddle.fluid.core as core
 
 random.seed(2021)
 
diff --git a/python/paddle/fluid/tests/unittests/test_broadcast_to_op.py b/python/paddle/fluid/tests/unittests/test_broadcast_to_op.py
index e8e876766c332612819900597260cd2953ed5f15..ea8e7648b1d32d3a35ee91fc4e7a4fb167da36a7 100644
--- a/python/paddle/fluid/tests/unittests/test_broadcast_to_op.py
+++ b/python/paddle/fluid/tests/unittests/test_broadcast_to_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_bucketize_api.py b/python/paddle/fluid/tests/unittests/test_bucketize_api.py
index e82d6e9d15c862e8a8efbf7505a5ea91f19a9601..3740ab4e579406198f49ab6c8b265bf0b8a414fc 100644
--- a/python/paddle/fluid/tests/unittests/test_bucketize_api.py
+++ b/python/paddle/fluid/tests/unittests/test_bucketize_api.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass.py b/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass.py
index 5534ff67915b2bf90f5dc82dc6ed35fa6c5e7087..284f0b8f77e7541c6c398e718a7096113cf41d50 100644
--- a/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import numpy as np
-from simple_nets import simple_fc_net
 import random
 import unittest
 
+import numpy as np
+from simple_nets import simple_fc_net
+
+import paddle
+import paddle.fluid as fluid
+
 batch_size = 32
 
 feed_dict = {
diff --git a/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass_and_fuse_optimization_op_pass.py b/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass_and_fuse_optimization_op_pass.py
index e9e62bee006801e98b3171d1c90e58160d50385f..115984ad7ce11b2ab0f3f0016db3b11cbf03b255 100644
--- a/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass_and_fuse_optimization_op_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_buffer_shared_memory_reuse_pass_and_fuse_optimization_op_pass.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from test_buffer_shared_memory_reuse_pass import InplaceTestBase
 import unittest
 
+from test_buffer_shared_memory_reuse_pass import InplaceTestBase
+
 
 class CUDAInplaceTestWithFuseOptimizationOps(InplaceTestBase):
     def initParameter(self):
diff --git a/python/paddle/fluid/tests/unittests/test_build_strategy_fusion_group_pass.py b/python/paddle/fluid/tests/unittests/test_build_strategy_fusion_group_pass.py
index 962a5d3327c78eeecb75f33cfba3f96dead9caf7..a9ae9e85c36e4a079a0a4b4796246bcedf18d0c9 100644
--- a/python/paddle/fluid/tests/unittests/test_build_strategy_fusion_group_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_build_strategy_fusion_group_pass.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
+from test_eager_deletion_padding_rnn import PaddingRNNTestBase, RNNConfig
+
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from test_eager_deletion_padding_rnn import RNNConfig, PaddingRNNTestBase
 
 
 class FusionGroupPaddingRNNTest(PaddingRNNTestBase):
diff --git a/python/paddle/fluid/tests/unittests/test_c_comm_init_all_op.py b/python/paddle/fluid/tests/unittests/test_c_comm_init_all_op.py
index 7f4eac0d3fb36ac83d2a27776d56777f396896ed..1863210d4c7eed28e1ed51d1b0925423b834119c 100644
--- a/python/paddle/fluid/tests/unittests/test_c_comm_init_all_op.py
+++ b/python/paddle/fluid/tests/unittests/test_c_comm_init_all_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_c_embedding_op.py b/python/paddle/fluid/tests/unittests/test_c_embedding_op.py
index 66c68097127a2d42cddde46225b99f25e00381f0..87a976d5b83086bf6801c5b4048accbbac2187f9 100644
--- a/python/paddle/fluid/tests/unittests/test_c_embedding_op.py
+++ b/python/paddle/fluid/tests/unittests/test_c_embedding_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from paddle.fluid.tests.unittests.c_embedding_op_base import (
     TestCEmbeddingCPU,
     TestCEmbeddingOpBase,
diff --git a/python/paddle/fluid/tests/unittests/test_calc_gradient.py b/python/paddle/fluid/tests/unittests/test_calc_gradient.py
index 59bc1f574e443aed65c5723d9942dc7cd58a594a..58c4ee6083f7ff1669cb725be2d1cdb6b2d31a21 100644
--- a/python/paddle/fluid/tests/unittests/test_calc_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_calc_gradient.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
 from paddle.fluid.backward import calc_gradient
diff --git a/python/paddle/fluid/tests/unittests/test_case.py b/python/paddle/fluid/tests/unittests/test_case.py
index c0ef9f811efc1d9ea977282cb0c27534f5e93c4f..7008544d17a68babc76884ce342431fea7c8428f 100644
--- a/python/paddle/fluid/tests/unittests/test_case.py
+++ b/python/paddle/fluid/tests/unittests/test_case.py
@@ -12,16 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
+from functools import partial
+
+import numpy as np
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.layers as layers
-from paddle.fluid.framework import Program, program_guard
-from functools import partial
 import paddle.fluid.optimizer as optimizer
+from paddle.fluid.framework import Program, program_guard
 
 
 class TestAPICase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_cast_op.py b/python/paddle/fluid/tests/unittests/test_cast_op.py
index 8665e285fa5cfb8256737a13362d4571f98e7388..96ad3246f41b6d6a2fa481d9489e5997d90a855b 100644
--- a/python/paddle/fluid/tests/unittests/test_cast_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cast_op.py
@@ -13,17 +13,18 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
+from op_test import OpTest, convert_float_to_uint16, convert_uint16_to_float
 
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.fluid.layers as layers
 from paddle.fluid import Program, program_guard
-from op_test import OpTest, convert_uint16_to_float, convert_float_to_uint16
 from paddle.fluid.framework import _test_eager_guard
-import gradient_checker
-from decorator_helper import prog_scope
-import paddle.fluid.layers as layers
 
 
 class TestCastOpFp32ToFp64(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_center_loss.py b/python/paddle/fluid/tests/unittests/test_center_loss.py
index bf21e64945f565fa088bf14886453e99ae0bd0c1..15a69ac8e5c202fd53e6951ff49b01cf61b57070 100644
--- a/python/paddle/fluid/tests/unittests/test_center_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_center_loss.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_channel_shuffle.py b/python/paddle/fluid/tests/unittests/test_channel_shuffle.py
index 0da2a651477e2bad0f74dcb6ae2836913535ec16..bfad2bd94d3e6dc7363d0bf5b92a944e4ecd1226 100644
--- a/python/paddle/fluid/tests/unittests/test_channel_shuffle.py
+++ b/python/paddle/fluid/tests/unittests/test_channel_shuffle.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
+import numpy as np
 from op_test import OpTest
+
 import paddle
-import paddle.nn.functional as F
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.nn.functional as F
 
 
 def channel_shuffle_np(x, groups, data_format="NCHW"):
diff --git a/python/paddle/fluid/tests/unittests/test_check_import_scipy.py b/python/paddle/fluid/tests/unittests/test_check_import_scipy.py
index f06b5c97e3f904b59734aa28124880d8add76c7b..801528ebce80ea330e07a682a579dea761671d26 100644
--- a/python/paddle/fluid/tests/unittests/test_check_import_scipy.py
+++ b/python/paddle/fluid/tests/unittests/test_check_import_scipy.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import builtins
-from paddle.check_import_scipy import check_import_scipy
 import unittest
 
+from paddle.check_import_scipy import check_import_scipy
+
 
 def my_import(name, globals=None, locals=None, fromlist=(), level=0):
     raise ImportError('DLL load failed, unittest: import scipy failed')
diff --git a/python/paddle/fluid/tests/unittests/test_checkpoint_saver.py b/python/paddle/fluid/tests/unittests/test_checkpoint_saver.py
index f3b539d8057aeb3b5ee0314f32ffc86d5d416e4a..cd2abeb70162806d1ee538faae35edb5579652a4 100644
--- a/python/paddle/fluid/tests/unittests/test_checkpoint_saver.py
+++ b/python/paddle/fluid/tests/unittests/test_checkpoint_saver.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import unittest
-from paddle.fluid.incubate.checkpoint.checkpoint_saver import CheckpointSaver
 
 from paddle.distributed.fleet.utils.fs import HDFSClient
 from paddle.fluid.incubate.checkpoint.checkpoint_saver import CheckpointSaver
diff --git a/python/paddle/fluid/tests/unittests/test_cholesky_op.py b/python/paddle/fluid/tests/unittests/test_cholesky_op.py
index 0688a782f7287dcf97b7a77de18a998f1652105c..ffeb18b0ff90b543e433234bd96516af73082664 100644
--- a/python/paddle/fluid/tests/unittests/test_cholesky_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cholesky_op.py
@@ -13,14 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from decorator_helper import prog_scope
+from gradient_checker import grad_check
+from op_test import OpTest, skip_check_grad_ci
+
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
-from op_test import OpTest, skip_check_grad_ci
-from gradient_checker import grad_check
-from decorator_helper import prog_scope
+import paddle.fluid.layers as layers
 
 
 @skip_check_grad_ci(
diff --git a/python/paddle/fluid/tests/unittests/test_cholesky_solve_op.py b/python/paddle/fluid/tests/unittests/test_cholesky_solve_op.py
index 5ed62fe2e0076de9b41bae6023f81614a01e1b27..49c50e2280c71705908570d26b21f3fcaf820180 100644
--- a/python/paddle/fluid/tests/unittests/test_cholesky_solve_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cholesky_solve_op.py
@@ -12,18 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.w
 
+import sys
 import unittest
+
 import numpy as np
 import scipy
 import scipy.linalg
 
-import sys
-
 sys.path.append("..")
-import paddle
 from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard, core
+from paddle.fluid import Program, core, program_guard
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_chunk_eval_op.py b/python/paddle/fluid/tests/unittests/test_chunk_eval_op.py
index 1cbf8ebabb80422b47b69a24aa873ed593965e9c..a79827f2fefdd87b6c1be0afc20ace4c9c119f39 100644
--- a/python/paddle/fluid/tests/unittests/test_chunk_eval_op.py
+++ b/python/paddle/fluid/tests/unittests/test_chunk_eval_op.py
@@ -13,9 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import numpy as np
 
 
 class Segment:
diff --git a/python/paddle/fluid/tests/unittests/test_chunk_op.py b/python/paddle/fluid/tests/unittests/test_chunk_op.py
index f29d90ceb73dc5ccea8ff8938c3151e823eda3e8..7124409727668f1c65dca437347a20e2f2db3157 100644
--- a/python/paddle/fluid/tests/unittests/test_chunk_op.py
+++ b/python/paddle/fluid/tests/unittests/test_chunk_op.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import numpy as np
-from paddle.fluid import Program, program_guard
-from paddle import fluid
+
 import paddle
+from paddle import fluid
+from paddle.fluid import Program, program_guard
 
 
 class TestChunkOpError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_class_center_sample_op.py b/python/paddle/fluid/tests/unittests/test_class_center_sample_op.py
index 53b9cfad3453012b62e53d889a82487c09b6b831..9eaf77fcad6a1833a893df1433dbdc0e3a31e881 100644
--- a/python/paddle/fluid/tests/unittests/test_class_center_sample_op.py
+++ b/python/paddle/fluid/tests/unittests/test_class_center_sample_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
-from op_test import OpTest
 from paddle.fluid import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_clip_by_norm_op.py b/python/paddle/fluid/tests/unittests/test_clip_by_norm_op.py
index d7b9c6cd528552fd8f1a37418389407293bf6033..a9d79f81bf310b9a1d94202c655571c948857909 100644
--- a/python/paddle/fluid/tests/unittests/test_clip_by_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_clip_by_norm_op.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_clip_op.py b/python/paddle/fluid/tests/unittests/test_clip_op.py
index e955bd71a643077fe2f30c832aa891c1cdf8db0b..e6056c50124811f34e1cb1fe8fb4063e801f72e0 100644
--- a/python/paddle/fluid/tests/unittests/test_clip_op.py
+++ b/python/paddle/fluid/tests/unittests/test_clip_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
-from op_test import OpTest
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_coalesce_tensor_op.py b/python/paddle/fluid/tests/unittests/test_coalesce_tensor_op.py
index bcd9eb412bc9965005529def81b5f5620dbd9407..d4b25f7bd213672b8abdd0b4b8894a49903606dd 100644
--- a/python/paddle/fluid/tests/unittests/test_coalesce_tensor_op.py
+++ b/python/paddle/fluid/tests/unittests/test_coalesce_tensor_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from paddle.fluid import core
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
+from paddle.fluid import core
 
 
 def coalesce_tensor_eager_api(
diff --git a/python/paddle/fluid/tests/unittests/test_collect_fpn_proposals_op.py b/python/paddle/fluid/tests/unittests/test_collect_fpn_proposals_op.py
index 06011ee62d8dfe4e0b6b556272583c8a43d50020..4898eeecfdc875057617c1858ed73e87c15ca7e6 100644
--- a/python/paddle/fluid/tests/unittests/test_collect_fpn_proposals_op.py
+++ b/python/paddle/fluid/tests/unittests/test_collect_fpn_proposals_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_collective_api_base.py b/python/paddle/fluid/tests/unittests/test_collective_api_base.py
index 68b44a186df25d472df3e643cb00904995d72e93..096ac99f9c9973c801eb1a14eeccf6e3d1abcc20 100644
--- a/python/paddle/fluid/tests/unittests/test_collective_api_base.py
+++ b/python/paddle/fluid/tests/unittests/test_collective_api_base.py
@@ -12,18 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import unittest
 import os
-import sys
-import subprocess
 import pickle
+import subprocess
+import sys
 import tempfile
+import unittest
 from contextlib import closing
+
+import numpy as np
+from paddle_bfloat import bfloat16
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from paddle_bfloat import bfloat16
 
 
 def create_bool_test_data(shape=None, seed=None):
diff --git a/python/paddle/fluid/tests/unittests/test_collective_base.py b/python/paddle/fluid/tests/unittests/test_collective_base.py
index 08d6fca95a4316f6344531be5f51bfa75fd4435d..1483cd1d07a9c72d54e52d04c6d3d8fa2e15c8f0 100644
--- a/python/paddle/fluid/tests/unittests/test_collective_base.py
+++ b/python/paddle/fluid/tests/unittests/test_collective_base.py
@@ -12,15 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import unittest
-import time
 import os
-import sys
-import subprocess
 import pickle
+import subprocess
+import sys
 import tempfile
+import time
+import unittest
 from contextlib import closing
+
+import numpy as np
+
 import paddle.fluid as fluid
 import paddle.fluid.unique_name as nameGen
 from paddle.fluid import core
diff --git a/python/paddle/fluid/tests/unittests/test_communicator_async.py b/python/paddle/fluid/tests/unittests/test_communicator_async.py
index 33a98a5c894c2e5d926dada60f3ad372835e84be..978e0d644c7271855639dea65c036fd98d79850a 100644
--- a/python/paddle/fluid/tests/unittests/test_communicator_async.py
+++ b/python/paddle/fluid/tests/unittests/test_communicator_async.py
@@ -13,16 +13,16 @@
 # limitations under the License.
 
 import os
-import unittest
 import time
+import unittest
 
 import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 
 class TestCommunicator(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_communicator_geo.py b/python/paddle/fluid/tests/unittests/test_communicator_geo.py
index 0efea743f3314473f0c4416bddc17117c3ba420f..9363e2fe4727c7bea633db5ea12b99a4c2f3d84c 100644
--- a/python/paddle/fluid/tests/unittests/test_communicator_geo.py
+++ b/python/paddle/fluid/tests/unittests/test_communicator_geo.py
@@ -13,18 +13,17 @@
 # limitations under the License.
 
 import os
+import subprocess
 import sys
 import time
-import subprocess
 import unittest
+
 import numpy
 
 import paddle
-import paddle.fluid as fluid
-
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
-
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 from paddle.distributed.utils.launch_utils import find_free_ports
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_communicator_ps_gpu.py b/python/paddle/fluid/tests/unittests/test_communicator_ps_gpu.py
index 328874b3f55656857f71fb76d79fdee53e4fa465..fbea8b003ceda4ba602f03664096a890a0214b94 100644
--- a/python/paddle/fluid/tests/unittests/test_communicator_ps_gpu.py
+++ b/python/paddle/fluid/tests/unittests/test_communicator_ps_gpu.py
@@ -13,17 +13,17 @@
 # limitations under the License.
 
 import os
-import unittest
-import time
 import tempfile
+import time
+import unittest
 
 import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 
 class TestCommunicator(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_compare_op.py b/python/paddle/fluid/tests/unittests/test_compare_op.py
index 191f250c4530d32a154424a68921d50a7225d3c0..8cce73391d692e346277218ff74e72fda4392a5e 100755
--- a/python/paddle/fluid/tests/unittests/test_compare_op.py
+++ b/python/paddle/fluid/tests/unittests/test_compare_op.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import op_test
 import unittest
+
 import numpy
 import numpy as np
+import op_test
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_compare_reduce_op.py b/python/paddle/fluid/tests/unittests/test_compare_reduce_op.py
index fb8a7057fd7d4f9bece4d12bcd9e48abc0153114..bc176faea8a06afdecdc2db44f5cfc21f25f78dc 100644
--- a/python/paddle/fluid/tests/unittests/test_compare_reduce_op.py
+++ b/python/paddle/fluid/tests/unittests/test_compare_reduce_op.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import op_test
 import unittest
+
 import numpy as np
+import op_test
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_compiled_program.py b/python/paddle/fluid/tests/unittests/test_compiled_program.py
index 8418de88fd86589574588b9caebfb3ac4374e6a3..70edcc5358afb249ff0e1a32d6c3562fc4f10fdf 100644
--- a/python/paddle/fluid/tests/unittests/test_compiled_program.py
+++ b/python/paddle/fluid/tests/unittests/test_compiled_program.py
@@ -13,12 +13,14 @@
 # limitations under the license.
 
 import unittest
+
 import numpy as np
+from simple_nets import simple_fc_net
+from test_imperative_base import new_program_scope
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from test_imperative_base import new_program_scope
-from simple_nets import simple_fc_net
 
 
 class TestCompiledProgram(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_complex_abs.py b/python/paddle/fluid/tests/unittests/test_complex_abs.py
index 968bcb79613180781315cadf8f09abcd7f627c89..8d21f76d64ff9671e1f9198378856d7551550f13 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_abs.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_abs.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
 
 import paddle
 import paddle.fluid.dygraph as dg
-from op_test import OpTest
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_cast.py b/python/paddle/fluid/tests/unittests/test_complex_cast.py
index 9065b2d008d33328d91ec34d792eed0cbd126bfb..8302ba585856b01965b18800a49b07f43668bb6e 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_cast.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_cast.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_complex_elementwise_layers.py b/python/paddle/fluid/tests/unittests/test_complex_elementwise_layers.py
index 14bdec6101ab2d19adffe510a95c8d785eceed18..98a95eb37a099bb46519cd93364239d0fcf3558f 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_elementwise_layers.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_elementwise_layers.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from numpy.random import random as rand
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_getitem.py b/python/paddle/fluid/tests/unittests/test_complex_getitem.py
index 7446e8f6dfefa58a4bd7bcbb6a570627e77862d3..09aca3b060f3077d5470fc037f8feec1d13ac20a 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_getitem.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_getitem.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_complex_grad_accumulated.py b/python/paddle/fluid/tests/unittests/test_complex_grad_accumulated.py
index f7597bfcc6982bc26df612e4d0ee951a77d7a310..10ff998226f7a0f1d158cbbfb4c8cafe40533861 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_grad_accumulated.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_grad_accumulated.py
@@ -13,10 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
-
 import paddle.fluid.core as core
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_kron.py b/python/paddle/fluid/tests/unittests/test_complex_kron.py
index 537a4d0d070988dface20e6a7ec0708bca904a3c..77c5d9642977322986abf855dedb2bd5253eeaf6 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_kron.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_kron.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle import fluid
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid.dygraph as dg
-import numpy as np
-import unittest
+from paddle import fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_matmul.py b/python/paddle/fluid/tests/unittests/test_complex_matmul.py
index f803930d2ad3e86bd17d1eeee614456ccea83c85..b6793e35d31f77e15825e07a6cb621091a03a438 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_matmul.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_matmul.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_complex_op.py b/python/paddle/fluid/tests/unittests/test_complex_op.py
index 01c6b55921bd21ea521d174e7b101b2f7c8fa615..854fad15bab376b54fe6829fb0d4e27231843567 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_op.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_op.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
 import paddle
-from paddle.fluid import dygraph
 from paddle import static
+from paddle.fluid import dygraph
 from paddle.fluid.framework import _test_eager_guard
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_complex_reshape.py b/python/paddle/fluid/tests/unittests/test_complex_reshape.py
index 0e8398cf816eab5783ba6fefaae9eb331decdb98..00b939e959c7d9adc61e2e8606038a0291633df3 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_reshape.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_reshape.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
+import unittest
+
+import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
-import numpy as np
-import unittest
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_simplenet.py b/python/paddle/fluid/tests/unittests/test_complex_simplenet.py
index b52cda8a64a63accbfc8fd0ec1c872404f3e753f..f9c59f88116bfcdd0530fe8761da83564546efdb 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_simplenet.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_simplenet.py
@@ -13,10 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
-
 import paddle.fluid.core as core
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_sum_layer.py b/python/paddle/fluid/tests/unittests/test_complex_sum_layer.py
index 7de44b33b0fce1194db33d31ba769ddbf56aaca2..09d4828de9bb9057044f5139f38164c8795d912c 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_sum_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_sum_layer.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from numpy.random import random as rand
-from paddle import tensor
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
+from paddle import tensor
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_trace_layer.py b/python/paddle/fluid/tests/unittests/test_complex_trace_layer.py
index bb8bc7f445c19f68fe89fc8105828f9bc7e6e3b8..d0188ae9b198780259c283d5c6605835f33287ba 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_trace_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_trace_layer.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from numpy.random import random as rand
-from paddle import tensor
+
 import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
+from paddle import tensor
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_complex_transpose.py b/python/paddle/fluid/tests/unittests/test_complex_transpose.py
index b08f7e1be0716d6ff409db90dea87c85f71da0b3..adc421a96605b669a6a8362768bc6abb370c3f2d 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_transpose.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_transpose.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_complex_variable.py b/python/paddle/fluid/tests/unittests/test_complex_variable.py
index b3afc1d9df9df260eaab478f168794473419be60..588f87b3b2cb614ef65758b78de38bf682e4be8d 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_variable.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_variable.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
-import paddle.fluid.dygraph as dg
 import paddle.fluid.core as core
-from paddle.fluid.framework import convert_np_dtype_to_dtype_
+import paddle.fluid.dygraph as dg
 from paddle.fluid.data_feeder import convert_dtype
-from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.framework import _test_eager_guard, convert_np_dtype_to_dtype_
 
 
 class TestComplexVariable(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_complex_view_op.py b/python/paddle/fluid/tests/unittests/test_complex_view_op.py
index 451469dfa21010715346611dc7930c3159d4cb22..e73c936e4a9b6f0a0117f707e433936da38fc09f 100644
--- a/python/paddle/fluid/tests/unittests/test_complex_view_op.py
+++ b/python/paddle/fluid/tests/unittests/test_complex_view_op.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
 import paddle
-from paddle.fluid import dygraph
 from paddle import static
+from paddle.fluid import dygraph
 from paddle.fluid.framework import _test_eager_guard
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_concat_op.py b/python/paddle/fluid/tests/unittests/test_concat_op.py
index 624f2be4a9f8ec6e2903273796f5e2bf142b4e81..79984c4a96da46aa2ce5c1b5dcb416198fed0851 100644
--- a/python/paddle/fluid/tests/unittests/test_concat_op.py
+++ b/python/paddle/fluid/tests/unittests/test_concat_op.py
@@ -13,19 +13,21 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
+
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.layers as layers
+from paddle.fluid import Program, core, program_guard
+from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.tests.unittests.op_test import (
     OpTest,
-    skip_check_grad_ci,
     convert_float_to_uint16,
+    skip_check_grad_ci,
 )
-import paddle.fluid as fluid
-from paddle.fluid import Program, core, program_guard
-from paddle.fluid.framework import _test_eager_guard
-import paddle
-import gradient_checker
-from decorator_helper import prog_scope
-import paddle.fluid.layers as layers
 
 
 class TestConcatOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_cond.py b/python/paddle/fluid/tests/unittests/test_cond.py
index 176be73afe49fcf995af1c313ba84f3acbf7da8d..41bfcff7363b87295ebed4272039fb426b34340d 100644
--- a/python/paddle/fluid/tests/unittests/test_cond.py
+++ b/python/paddle/fluid/tests/unittests/test_cond.py
@@ -12,18 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import os
 import unittest
+
+import numpy as np
+from simple_nets import batchnorm_fc_with_inputs, simple_fc_net_with_inputs
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import paddle.fluid.layers as layers
 import paddle.fluid.framework as framework
+import paddle.fluid.layers as layers
 from paddle.fluid.backward import append_backward
 from paddle.fluid.framework import Program, program_guard
-from simple_nets import simple_fc_net_with_inputs, batchnorm_fc_with_inputs
-import paddle
 
 np.random.seed(123)
 
diff --git a/python/paddle/fluid/tests/unittests/test_conditional_block.py b/python/paddle/fluid/tests/unittests/test_conditional_block.py
index fc8d926070e3e99a77eee4feb6fde67c805de213..418ae3875998e7acc0f883e660b5e426da71c253 100644
--- a/python/paddle/fluid/tests/unittests/test_conditional_block.py
+++ b/python/paddle/fluid/tests/unittests/test_conditional_block.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
-from paddle.fluid.executor import Executor
+import paddle.fluid.layers as layers
 from paddle.fluid.backward import append_backward
+from paddle.fluid.executor import Executor
 from paddle.fluid.layers.control_flow import ConditionalBlock
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_conj_op.py b/python/paddle/fluid/tests/unittests/test_conj_op.py
index 67647458f5da7eb2b292654b58c6f7972ae93275..44698f5679b2de1975ea2f596bbee891243a8fd8 100644
--- a/python/paddle/fluid/tests/unittests/test_conj_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conj_op.py
@@ -12,16 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import sys
 import unittest
+
 import numpy as np
+
 import paddle
-import sys
 
 sys.path.append("..")
+from numpy.random import random as rand
 from op_test import OpTest
+
 import paddle.fluid.dygraph as dg
 import paddle.static as static
-from numpy.random import random as rand
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_const_value.py b/python/paddle/fluid/tests/unittests/test_const_value.py
index 58ac6fa0a9a30a08a831111513777cca59062724..727da878f9beda09f4ed2c5bdb00b76523fe5566 100644
--- a/python/paddle/fluid/tests/unittests/test_const_value.py
+++ b/python/paddle/fluid/tests/unittests/test_const_value.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle.fluid.framework as framework
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_context_manager.py b/python/paddle/fluid/tests/unittests/test_context_manager.py
index 9ae5630b0aff92dcac937e2a8a1246989f019a9d..719ade5d49d463bb140c1124bedd12e05aca8f02 100644
--- a/python/paddle/fluid/tests/unittests/test_context_manager.py
+++ b/python/paddle/fluid/tests/unittests/test_context_manager.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest
 
+import paddle.fluid as fluid
+
 
 class TestContextManagerRaiseException(unittest.TestCase):
     # When exception raised in 'with' context, we should safely exit the context
diff --git a/python/paddle/fluid/tests/unittests/test_conv1d_layer.py b/python/paddle/fluid/tests/unittests/test_conv1d_layer.py
index 2de244b9b28f93b626b821680cff5ce6c9ae9d55..441318c51296275fe3c4297cdcd6e79ffaa0dfa0 100644
--- a/python/paddle/fluid/tests/unittests/test_conv1d_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_conv1d_layer.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle import fluid, nn
 import paddle.fluid.dygraph as dg
 import paddle.nn.functional as F
-import unittest
+from paddle import fluid, nn
 
 
 class Conv1DTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv1d_transpose_layer.py b/python/paddle/fluid/tests/unittests/test_conv1d_transpose_layer.py
index bd19ab1138d8ff300ffe1534a60f08a1d70f967d..45edd261bc6eda2b822ff4712d4e0b924f4b1dbb 100644
--- a/python/paddle/fluid/tests/unittests/test_conv1d_transpose_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_conv1d_transpose_layer.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle import fluid, nn
 import paddle.fluid.dygraph as dg
 import paddle.nn.functional as F
-import unittest
+from paddle import fluid, nn
 
 
 class Conv1DTransposeTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_api.py b/python/paddle/fluid/tests/unittests/test_conv2d_api.py
index 13616155d9e3f52df330f78eb89600a52f1d8360..ef1035d09ccc3182749a5837b7186225a337cdaa 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_api.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_api.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
 
 paddle.enable_static()
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 class TestConv2DAPI(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_fusion_op.py b/python/paddle/fluid/tests/unittests/test_conv2d_fusion_op.py
index 7e4a01331578be14582f89c20065ad34c1d980b8..3e5ec0f8a9788fb770ebe7aa4c9f367e6d529209 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_fusion_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_fusion_op.py
@@ -13,13 +13,13 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
-import paddle.fluid.core as core
+import numpy as np
 from op_test import OpTest
-
 from test_conv2d_op import conv2d_forward_naive
 
+import paddle.fluid.core as core
+
 
 def create_test_padding_SAME_class(parent):
     class TestPaddingSAMECase(parent):
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_layer.py b/python/paddle/fluid/tests/unittests/test_conv2d_layer.py
index 6716bf7ada046e2056150305d7229a44b3f16d2a..bdaaac3b8c3e691d5ab55399642ba675e42bedc2 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_layer.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
-from paddle import fluid, nn
+
+import paddle
 import paddle.fluid.dygraph as dg
-import paddle.nn.functional as F
 import paddle.fluid.initializer as I
-import unittest
-import paddle
+import paddle.nn.functional as F
+from paddle import fluid, nn
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_op.py b/python/paddle/fluid/tests/unittests/test_conv2d_op.py
index 0c22f7ff7b2778c7b8609c66fbba294c84aeca6d..ac2947a64aa8ffa9604c7fb660c841367ce60835 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_op.py
@@ -13,19 +13,19 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+from paddle.fluid import Program, program_guard
 from paddle.fluid.tests.unittests.op_test import (
     OpTest,
     convert_float_to_uint16,
     get_numeric_gradient,
 )
 from paddle.fluid.tests.unittests.testsuite import create_op
-from paddle.fluid import Program, program_guard
 
 
 def conv2d_forward_naive(
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_op_depthwise_conv.py b/python/paddle/fluid/tests/unittests/test_conv2d_op_depthwise_conv.py
index d6abdc0bcf41f1ead0b7671531d6b3670a13ec46..fe1a8a0f219e4f4a923859d347adf4874490a5b1 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_op_depthwise_conv.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_op_depthwise_conv.py
@@ -13,22 +13,24 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
 
 paddle.enable_static()
-import paddle.fluid.core as core
 from test_conv2d_op import (
     TestConv2DOp,
     TestConv2DOp_v2,
-    create_test_padding_SAME_class,
-    create_test_padding_VALID_class,
     create_test_channel_last_class,
-    create_test_cudnn_padding_SAME_class,
     create_test_cudnn_channel_last_class,
+    create_test_cudnn_padding_SAME_class,
+    create_test_padding_SAME_class,
+    create_test_padding_VALID_class,
 )
 
+import paddle.fluid.core as core
+
 # ----------------TestDepthwiseConv -----
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_transpose_layer.py b/python/paddle/fluid/tests/unittests/test_conv2d_transpose_layer.py
index 266543bf16af3e7cc3e80bf6ab126cb91ffd8e1a..9eeb4fc82dfb149ed2424bb068d39d0a23339dce 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_transpose_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_transpose_layer.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle import fluid, nn
 import paddle.fluid.dygraph as dg
-import paddle.nn.functional as F
 import paddle.fluid.initializer as I
-import unittest
+import paddle.nn.functional as F
+from paddle import fluid, nn
 
 
 class Conv2DTransposeTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op.py b/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op.py
index f22a536cda8882338fd53d75a2cd34c92947b5ac..8d87195db497a5eb8dd034fb9a0b850cf0eb8db3 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op.py
@@ -14,17 +14,19 @@
 
 import os
 import unittest
+
 import numpy as np
 
 import paddle
 import paddle.nn as nn
 
 paddle.enable_static()
-import paddle.fluid.core as core
+from op_test import OpTest
+from test_attribute_var import UnittestBase
+
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
-from test_attribute_var import UnittestBase
-from op_test import OpTest
 
 
 def conv2dtranspose_forward_naive(input_, filter_, attrs):
diff --git a/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op_depthwise_conv.py b/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op_depthwise_conv.py
index a50b0e2cb967307c24ffb8dd6ef95f4315f7c59f..d0e3b756fc29631ff22d36c83a5c980d2d3e348a 100644
--- a/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op_depthwise_conv.py
+++ b/python/paddle/fluid/tests/unittests/test_conv2d_transpose_op_depthwise_conv.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_conv3d_layer.py b/python/paddle/fluid/tests/unittests/test_conv3d_layer.py
index fd7dc6bb630291304dd6e5fd8ee3862d75d91fc5..e4d1da2978720ee6d59bb5985025d584f4f306e8 100644
--- a/python/paddle/fluid/tests/unittests/test_conv3d_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_conv3d_layer.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
-from paddle import fluid, nn
+
+import paddle
 import paddle.fluid.dygraph as dg
-import paddle.nn.functional as F
 import paddle.fluid.initializer as I
-import paddle
+import paddle.nn.functional as F
+from paddle import fluid, nn
 from paddle.fluid.framework import _test_eager_guard
-import unittest
 
 
 class Conv3DTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv3d_op.py b/python/paddle/fluid/tests/unittests/test_conv3d_op.py
index d9cd69e4d550ce57f195df9da2a0410937fc56b8..dc2760307cfbd06f1f20c151649d5ed75ba05e33 100644
--- a/python/paddle/fluid/tests/unittests/test_conv3d_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv3d_op.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
-import paddle.fluid.core as core
+import numpy as np
 from op_test import OpTest
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 def conv3d_forward_naive(
diff --git a/python/paddle/fluid/tests/unittests/test_conv3d_transpose_layer.py b/python/paddle/fluid/tests/unittests/test_conv3d_transpose_layer.py
index 6c690595a0072e40c0f19476ab28946e1154132a..1ea071142c6c733f5bf3a557ee8a1e0d48ccbc48 100644
--- a/python/paddle/fluid/tests/unittests/test_conv3d_transpose_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_conv3d_transpose_layer.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle import fluid, nn
 import paddle.fluid.dygraph as dg
-import paddle.nn.functional as F
 import paddle.fluid.initializer as I
-import unittest
+import paddle.nn.functional as F
+from paddle import fluid, nn
 
 
 class Conv3DTransposeTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv3d_transpose_op.py b/python/paddle/fluid/tests/unittests/test_conv3d_transpose_op.py
index 869d1d5f29a1329fb4e2725fcc718b0c88d85031..bf223b8d59fa58a68bea38318285b9d67b946747 100644
--- a/python/paddle/fluid/tests/unittests/test_conv3d_transpose_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv3d_transpose_op.py
@@ -13,14 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
 
 paddle.enable_static()
-import paddle.fluid.core as core
 from op_test import OpTest
 
+import paddle.fluid.core as core
+
 
 def conv3dtranspose_forward_naive(input_, filter_, attrs):
     padding_algorithm = attrs['padding_algorithm']
diff --git a/python/paddle/fluid/tests/unittests/test_conv3d_transpose_part2_op.py b/python/paddle/fluid/tests/unittests/test_conv3d_transpose_part2_op.py
index 80fb35f902a8fc9e6b63aade873095b97132c2c6..0ad217f6810243a0f134529d5b8ca0bf55aabcfc 100644
--- a/python/paddle/fluid/tests/unittests/test_conv3d_transpose_part2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv3d_transpose_part2_op.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_conv3d_transpose_op import TestConv3DTransposeOp
 
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-from test_conv3d_transpose_op import TestConv3DTransposeOp
+import paddle.fluid.core as core
 
 
 class TestWithSymmetricPad_NHWC(TestConv3DTransposeOp):
diff --git a/python/paddle/fluid/tests/unittests/test_conv_nn_grad.py b/python/paddle/fluid/tests/unittests/test_conv_nn_grad.py
index 19b9d6fdee97c47d794314ad8d903f3159f6c262..890fe3b10c7bd83b6b31a20d366ae6bdd8a8ab08 100644
--- a/python/paddle/fluid/tests/unittests/test_conv_nn_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_conv_nn_grad.py
@@ -13,15 +13,15 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
-import paddle
+from decorator_helper import prog_scope
 
+import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
-import gradient_checker
-
-from decorator_helper import prog_scope
+import paddle.fluid.layers as layers
 
 
 class TestConvDoubleGradCheck(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_conv_shift_op.py b/python/paddle/fluid/tests/unittests/test_conv_shift_op.py
index 57a2038d3f59bbb037d0d3bd5537488fa501a833..26965d9b393cb1eaa0d438c262012bf04eb8264d 100644
--- a/python/paddle/fluid/tests/unittests/test_conv_shift_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv_shift_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_conv_transpose_nn_grad.py b/python/paddle/fluid/tests/unittests/test_conv_transpose_nn_grad.py
index c37394ed83427430db48a83047f416c589d3061b..142359286bbea41b7fc2ce4bb5c0d8bd0ea4ffdb 100644
--- a/python/paddle/fluid/tests/unittests/test_conv_transpose_nn_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_conv_transpose_nn_grad.py
@@ -13,15 +13,15 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
-import gradient_checker
-
-from decorator_helper import prog_scope
+import paddle.fluid.layers as layers
 
 
 class TestConvTransposeDoubleGradCheck(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_corr.py b/python/paddle/fluid/tests/unittests/test_corr.py
index 82f28d3cd0046bf6632a5c3e8a5f1652907666ea..eb3eacddedf00b4e6242a6eafb1e99df626a61ae 100644
--- a/python/paddle/fluid/tests/unittests/test_corr.py
+++ b/python/paddle/fluid/tests/unittests/test_corr.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest
+
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 
 np_minor_version = int((np.__version__).split('.')[1])
 
diff --git a/python/paddle/fluid/tests/unittests/test_cos_sim_op.py b/python/paddle/fluid/tests/unittests/test_cos_sim_op.py
index 86d1e0e1a8ce7a4ddf2b13e2d90eb9395727af9d..15d1d1e75df84cf2e702071560d5e98166c805d4 100644
--- a/python/paddle/fluid/tests/unittests/test_cos_sim_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cos_sim_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_cosine_embedding_loss.py b/python/paddle/fluid/tests/unittests/test_cosine_embedding_loss.py
index 784e583b4f5f83f113e9533547b2a2bbdffbf2ff..f2846f165a7e71fca3da5b6186e2d2750a97b101 100644
--- a/python/paddle/fluid/tests/unittests/test_cosine_embedding_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_cosine_embedding_loss.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License
 
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.static as static
-import numpy as np
-import unittest
 
 
 def cosine_embedding_loss(input1, input2, label, margin=0.5, reduction='mean'):
diff --git a/python/paddle/fluid/tests/unittests/test_cosine_similarity_api.py b/python/paddle/fluid/tests/unittests/test_cosine_similarity_api.py
index 1c658d0ecc45836d69b4dfcd757d738e7c761187..0626066c34a83b4a9fa38a379a3f28f97aa64a23 100644
--- a/python/paddle/fluid/tests/unittests/test_cosine_similarity_api.py
+++ b/python/paddle/fluid/tests/unittests/test_cosine_similarity_api.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
+import paddle.fluid.core as core
 import paddle.nn as nn
 import paddle.nn.functional as F
-import paddle.fluid.core as core
-
-from paddle.fluid import Program, program_guard, Executor, default_main_program
+from paddle.fluid import Executor, Program, default_main_program, program_guard
 
 
 class TestCosineSimilarityAPI(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_count_nonzero_api.py b/python/paddle/fluid/tests/unittests/test_count_nonzero_api.py
index 55f34dd261218732ad7c89ae21457ff411577e12..516b0744598848dc89d9d1fa35c4100e4eb31c71 100644
--- a/python/paddle/fluid/tests/unittests/test_count_nonzero_api.py
+++ b/python/paddle/fluid/tests/unittests/test_count_nonzero_api.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_cov.py b/python/paddle/fluid/tests/unittests/test_cov.py
index b00fc5b3fe21109be203d5c0d3e9a64f009689e9..bf0857484ccae5acb69d46420c76585cd450776a 100644
--- a/python/paddle/fluid/tests/unittests/test_cov.py
+++ b/python/paddle/fluid/tests/unittests/test_cov.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest
+
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cpuonly_spawn.py b/python/paddle/fluid/tests/unittests/test_cpuonly_spawn.py
index 93821ee1e8bd8681041bd74d29d8d4b05c065ff9..1b74b0b8a526e9b120e2a6470213f7b9551fcfea 100644
--- a/python/paddle/fluid/tests/unittests/test_cpuonly_spawn.py
+++ b/python/paddle/fluid/tests/unittests/test_cpuonly_spawn.py
@@ -15,9 +15,9 @@
 import unittest
 
 import paddle
+import paddle.distributed as dist
 import paddle.nn as nn
 import paddle.optimizer as opt
-import paddle.distributed as dist
 
 
 class LinearNet(nn.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_create_global_var.py b/python/paddle/fluid/tests/unittests/test_create_global_var.py
index 45dc1e5202285364ed40e847e3459963d8cd2e80..1d5548718d6b92c7b276648bf878eeb68a5915a6 100644
--- a/python/paddle/fluid/tests/unittests/test_create_global_var.py
+++ b/python/paddle/fluid/tests/unittests/test_create_global_var.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_create_op_doc_string.py b/python/paddle/fluid/tests/unittests/test_create_op_doc_string.py
index 07c89eefc32fab37ce093e91d96fbe4471ecddc6..378e0e44ef81bb26325c91fc3347a2fefa4c3096 100644
--- a/python/paddle/fluid/tests/unittests/test_create_op_doc_string.py
+++ b/python/paddle/fluid/tests/unittests/test_create_op_doc_string.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle.fluid.layers as layers
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_create_parameter.py b/python/paddle/fluid/tests/unittests/test_create_parameter.py
index d70e06f184356ec8dc547b56531f27456b2ded5f..75231c40474b95a58788e5d60d1bb9d8056d5a42 100644
--- a/python/paddle/fluid/tests/unittests/test_create_parameter.py
+++ b/python/paddle/fluid/tests/unittests/test_create_parameter.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
-import paddle
 
 
 class TestCreateParameterError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_crf_decoding_op.py b/python/paddle/fluid/tests/unittests/test_crf_decoding_op.py
index 801a1622421cbecd20aa553ca18078186329a024..a18328a4038d2e50f69944ae223b71e037edeee4 100644
--- a/python/paddle/fluid/tests/unittests/test_crf_decoding_op.py
+++ b/python/paddle/fluid/tests/unittests/test_crf_decoding_op.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import random
-import numpy as np
+import unittest
 
+import numpy as np
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_crop_op.py b/python/paddle/fluid/tests/unittests/test_crop_op.py
index f495be8cbefaee5817e054ab9d72f89c85d94b80..5e13eacb6e5c947ba462e47ed5cdcae39b02b89d 100644
--- a/python/paddle/fluid/tests/unittests/test_crop_op.py
+++ b/python/paddle/fluid/tests/unittests/test_crop_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_crop_tensor_op.py b/python/paddle/fluid/tests/unittests/test_crop_tensor_op.py
index aeb0cfb6414a88043414980d7cdc725502c80ff3..620c10a2bd5f62442720c220e5e9e2977f730fac 100644
--- a/python/paddle/fluid/tests/unittests/test_crop_tensor_op.py
+++ b/python/paddle/fluid/tests/unittests/test_crop_tensor_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_cross_entropy2_op.py b/python/paddle/fluid/tests/unittests/test_cross_entropy2_op.py
index 9b8acb884ab4581bd9b91af432f8ab3a4aa7f550..1066f4d2c830551832971b00e96da50d9e86496b 100644
--- a/python/paddle/fluid/tests/unittests/test_cross_entropy2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cross_entropy2_op.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from op_test import OpTest
 import unittest
+
 import numpy as np
+from op_test import OpTest
 
 
 class CrossEntropy2OpTestBase(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_cross_entropy_loss.py b/python/paddle/fluid/tests/unittests/test_cross_entropy_loss.py
index 17c51dc741640d3a49c19b78ef2e653a0c58b527..7d6b23623b4987e2ac343ab431e05163accac699 100644
--- a/python/paddle/fluid/tests/unittests/test_cross_entropy_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_cross_entropy_loss.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import numpy as np
 import unittest
+
+import numpy as np
 from test_softmax_op import stable_softmax
 from test_softmax_with_cross_entropy_op import cross_entropy
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_cross_entropy_op.py b/python/paddle/fluid/tests/unittests/test_cross_entropy_op.py
index c9fe88f318e88a1ad88c07035451744cc39bb11c..4e139b1bef8f99acb5eb73eaaa4e7c19845b05bc 100644
--- a/python/paddle/fluid/tests/unittests/test_cross_entropy_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cross_entropy_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
 from op_test import OpTest, randomize_probability
+
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cross_op.py b/python/paddle/fluid/tests/unittests/test_cross_op.py
index 73580d6fc8fcd7888ae7505833dd3a9c9ce7ce10..6cc366b85c89fa5c057e37029c5ce6bf68791161 100644
--- a/python/paddle/fluid/tests/unittests/test_cross_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cross_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
diff --git a/python/paddle/fluid/tests/unittests/test_crypto.py b/python/paddle/fluid/tests/unittests/test_crypto.py
index 147615905fd8532d94d845607348cd443452b706..da0506b0080c22e9714315e1d2eba124a6b4ee15 100644
--- a/python/paddle/fluid/tests/unittests/test_crypto.py
+++ b/python/paddle/fluid/tests/unittests/test_crypto.py
@@ -12,11 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.fluid.core import CipherUtils
-from paddle.fluid.core import CipherFactory
-
 import unittest
 
+from paddle.fluid.core import CipherFactory, CipherUtils
+
 
 class CipherUtilsTestCase(unittest.TestCase):
     def test_gen_key(self):
diff --git a/python/paddle/fluid/tests/unittests/test_ctc_align.py b/python/paddle/fluid/tests/unittests/test_ctc_align.py
index b11dfe0254a252713b664c6bfabfd9718d9231fb..18d8cb35e6ebed1812981161579b69134a0bd497 100644
--- a/python/paddle/fluid/tests/unittests/test_ctc_align.py
+++ b/python/paddle/fluid/tests/unittests/test_ctc_align.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 
 
 def CTCAlign(input, lod, blank, merge_repeated, padding=0, input_length=None):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_cudnn_version.py b/python/paddle/fluid/tests/unittests/test_cuda_cudnn_version.py
index d8229247a817f66eb19da35a6d5506059701af2e..84c688ed9f8bad7600681eafb5ba8b97d2aae475 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_cudnn_version.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_cudnn_version.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_device_count.py b/python/paddle/fluid/tests/unittests/test_cuda_device_count.py
index 7789bcd944dedcfb8043b0722a97a3e29ad004d8..0e10a5f95a6d5a86e0c2551151b8555a08c763e7 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_device_count.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_device_count.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
 
+import paddle
+
 
 class TestDeviceCount(unittest.TestCase):
     def test_device_count(self):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_device_name_capability.py b/python/paddle/fluid/tests/unittests/test_cuda_device_name_capability.py
index 07ef914f0a311cce60098afa16af956a3abe5bd8..cfeaa84745fd51bfe82b04b265ba95875566fcb8 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_device_name_capability.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_device_name_capability.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
 
+import paddle
+
 
 class TestDeviceName(unittest.TestCase):
     def test_device_name_default(self):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_empty_cache.py b/python/paddle/fluid/tests/unittests/test_cuda_empty_cache.py
index 4aefb234bbfc144304c1687b4dd21387bb91a2a9..2af9418d063bf463797a7e724d8bb4e710ab2571 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_empty_cache.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_empty_cache.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
 
+import paddle
+
 
 class TestEmptyCache(unittest.TestCase):
     def test_empty_cache(self):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_graph.py b/python/paddle/fluid/tests/unittests/test_cuda_graph.py
index ce446264f39d52554106713f0919360a9d90a56e..d8ba91bad7b8a530fe3137b00b670f5e0878cf04 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_graph.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_graph.py
@@ -12,16 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-from paddle.device.cuda.graphs import CUDAGraph
-import unittest
-import numpy as np
 import os
 import pathlib
 import shutil
-from paddle.fluid.dygraph.base import switch_to_static_graph
+import unittest
+
+import numpy as np
 from simple_nets import simple_fc_net_with_inputs
 
+import paddle
+from paddle.device.cuda.graphs import CUDAGraph
+from paddle.fluid.dygraph.base import switch_to_static_graph
+
 
 def can_use_cuda_graph():
     return paddle.is_compiled_with_cuda() and not paddle.is_compiled_with_rocm()
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph.py b/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph.py
index 7b87dcc1ef969110ababdfec15c17a1844221675..9ef385cfa9078f85d2dc8a17c9a5b02ecf5d907c 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.nn as nn
 import unittest
+
 import numpy as np
-from paddle.device.cuda.graphs import wrap_cuda_graph, is_cuda_graph_supported
+
+import paddle
+import paddle.nn as nn
+from paddle.device.cuda.graphs import is_cuda_graph_supported, wrap_cuda_graph
 
 
 class SimpleModel(nn.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static.py b/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static.py
index f33fe76bff51184eaeddbd5e3ad350fbb88eec82..2e51237ca241fd7bb0dd19432e17e2c5eef3e442 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.nn as nn
-import unittest
-from paddle.device.cuda.graphs import wrap_cuda_graph, is_cuda_graph_supported
+from paddle.device.cuda.graphs import is_cuda_graph_supported, wrap_cuda_graph
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static_run.py b/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static_run.py
index 6dd36a19da61a62d69ed3dbbbb8770179c88bf7a..5601fbac533314fce7cf4a10b877b559255f911e 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static_run.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_graph_partial_graph_static_run.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.nn as nn
 import unittest
+
 import numpy as np
+
+import paddle
+import paddle.nn as nn
 from paddle.device.cuda.graphs import (
-    wrap_cuda_graph,
-    is_cuda_graph_supported,
     cuda_graph_transform,
+    is_cuda_graph_supported,
+    wrap_cuda_graph,
 )
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_max_memory_allocated.py b/python/paddle/fluid/tests/unittests/test_cuda_max_memory_allocated.py
index 909b9a44b11b74d2a0465850934826c10052baa6..e412945d19a9735d397a109dfbec04434f6bacee 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_max_memory_allocated.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_max_memory_allocated.py
@@ -12,14 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
-from paddle.fluid import core
+
+import paddle
 from paddle.device.cuda import (
     device_count,
-    memory_allocated,
     max_memory_allocated,
+    memory_allocated,
 )
+from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_max_memory_reserved.py b/python/paddle/fluid/tests/unittests/test_cuda_max_memory_reserved.py
index e067d293074ab8425085c24f6b0c4679daa344eb..9651d893fa7760b0caf49df8c4e11ba1afaeb190 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_max_memory_reserved.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_max_memory_reserved.py
@@ -12,14 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
-from paddle.fluid import core
+
+import paddle
 from paddle.device.cuda import (
     device_count,
-    memory_reserved,
     max_memory_reserved,
+    memory_reserved,
 )
+from paddle.fluid import core
 
 
 class TestMaxMemoryreserved(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_memory_allocated.py b/python/paddle/fluid/tests/unittests/test_cuda_memory_allocated.py
index 5b21a9b07e88f0db1fc877307bfda150719a7f0f..16bbb51d559ea7dd1dfce541a40e6be8ae6d10ab 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_memory_allocated.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_memory_allocated.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
-from paddle.fluid import core
+
+import paddle
 from paddle.device.cuda import device_count, memory_allocated
+from paddle.fluid import core
 
 
 class TestMemoryAllocated(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_memory_reserved.py b/python/paddle/fluid/tests/unittests/test_cuda_memory_reserved.py
index 6b2cdc45f1924200beaa680a9083a1e05563f553..bb671832d68215ea8542dea58bf5257ec0f727d9 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_memory_reserved.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_memory_reserved.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
-from paddle.fluid import core
+
+import paddle
 from paddle.device.cuda import device_count, memory_reserved
+from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_random_seed.py b/python/paddle/fluid/tests/unittests/test_cuda_random_seed.py
index d9bef511c9c51686afaac60772fed0411dc77802..7c3ba6add03122109d8bb5e4c9a7ac847756d4a1 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_random_seed.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_random_seed.py
@@ -14,14 +14,15 @@
 """Test cloud role maker."""
 
 import os
+import shutil
+import tempfile
 import unittest
 
-import paddle.fluid as fluid
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 import paddle.fluid.core as core
-import shutil
-import tempfile
 
 
 @unittest.skipIf(
diff --git a/python/paddle/fluid/tests/unittests/test_cuda_stream_event.py b/python/paddle/fluid/tests/unittests/test_cuda_stream_event.py
index 600cd04d1970f81e02c01658e312ebfcbbdd239d..8cb6b9566f4cd99cc60409e8ec4af292da3f1ebb 100644
--- a/python/paddle/fluid/tests/unittests/test_cuda_stream_event.py
+++ b/python/paddle/fluid/tests/unittests/test_cuda_stream_event.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.device import cuda
-import paddle
 import ctypes
-
 import unittest
+
 import numpy as np
 
+import paddle
+from paddle.device import cuda
+
 
 class TestCurrentStream(unittest.TestCase):
     def test_current_stream(self):
diff --git a/python/paddle/fluid/tests/unittests/test_cudnn_grucell.py b/python/paddle/fluid/tests/unittests/test_cudnn_grucell.py
index 39c25c909fdc6dc986c5f2e94d23bdac6847a6c8..6a1ed39157d529bdb52a5d9f6f69107a2d859b7e 100644
--- a/python/paddle/fluid/tests/unittests/test_cudnn_grucell.py
+++ b/python/paddle/fluid/tests/unittests/test_cudnn_grucell.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from paddle.fluid.dygraph import GRUCell
 
-import numpy as np
-
 np.random.seed = 123
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cudnn_lstmcell.py b/python/paddle/fluid/tests/unittests/test_cudnn_lstmcell.py
index 4eacff27d1432498fa759b510debd05e5bd57eb1..913dc958117342fdc9ba331f5396947d477306d1 100644
--- a/python/paddle/fluid/tests/unittests/test_cudnn_lstmcell.py
+++ b/python/paddle/fluid/tests/unittests/test_cudnn_lstmcell.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from paddle.fluid.dygraph import LSTMCell
 
-import numpy as np
-
 np.random.seed = 123
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_cumprod_op.py b/python/paddle/fluid/tests/unittests/test_cumprod_op.py
index a6aea5e33fd3391f109097fd2cd63e7cd3b7f89a..ee4b319c23db7fe5318d9b64362c0bc27b2c510b 100644
--- a/python/paddle/fluid/tests/unittests/test_cumprod_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cumprod_op.py
@@ -12,13 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import random
 import unittest
-import numpy as np
 
+import numpy as np
 from op_test import OpTest
-import random
-import paddle
 
+import paddle
 import paddle.fluid.core as core
 
 np.random.seed(0)
diff --git a/python/paddle/fluid/tests/unittests/test_cumsum_op.py b/python/paddle/fluid/tests/unittests/test_cumsum_op.py
index 1621b6c5432173a3b40bbeee696d752b76c9d47f..4675ac9f52c9cd714a3ce3220bbd5d9e67cfde69 100644
--- a/python/paddle/fluid/tests/unittests/test_cumsum_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cumsum_op.py
@@ -13,17 +13,19 @@
 # limitations under the License.
 
 import os
-import unittest
 import tempfile
+import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
 from op_test import OpTest
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-import paddle.inference as paddle_infer
-import gradient_checker
-from decorator_helper import prog_scope
+import paddle.fluid.core as core
 import paddle.fluid.layers as layers
+import paddle.inference as paddle_infer
 
 
 class TestCumsumOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_custom_grad_input.py b/python/paddle/fluid/tests/unittests/test_custom_grad_input.py
index 74f63f03f451f32f5e1351897fcb92aa6504678b..4a750a6c0752ab7ad43dd824d0452a9650ffde5c 100644
--- a/python/paddle/fluid/tests/unittests/test_custom_grad_input.py
+++ b/python/paddle/fluid/tests/unittests/test_custom_grad_input.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_cvm_op.py b/python/paddle/fluid/tests/unittests/test_cvm_op.py
index a6197e7d7261104c07e1d7b1180cdcbea35fc473..282167e8050cfcaab912004b96e5eae8673aada8 100644
--- a/python/paddle/fluid/tests/unittests/test_cvm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_cvm_op.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
+import unittest
 from math import log
+
+import numpy as np
 from op_test import OpTest
-import unittest
 
 
 def cvm_compute(X, item_width, use_cvm):
diff --git a/python/paddle/fluid/tests/unittests/test_cyclic_cifar_dataset.py b/python/paddle/fluid/tests/unittests/test_cyclic_cifar_dataset.py
index 01a588c4058a4cc17bfc1d3e593086809ac893c9..35a40e79726c329737362946a412882687eb331a 100644
--- a/python/paddle/fluid/tests/unittests/test_cyclic_cifar_dataset.py
+++ b/python/paddle/fluid/tests/unittests/test_cyclic_cifar_dataset.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
 
+import paddle
+
 
 class TestCifar10(unittest.TestCase):
     def test_main(self):
diff --git a/python/paddle/fluid/tests/unittests/test_data.py b/python/paddle/fluid/tests/unittests/test_data.py
index bcb956e25c38a330d7b32fadffd2c343dad312ba..25b2372e817c4ba8f49ce1a98a84e4ca8b4d6818 100644
--- a/python/paddle/fluid/tests/unittests/test_data.py
+++ b/python/paddle/fluid/tests/unittests/test_data.py
@@ -16,9 +16,9 @@ import unittest
 
 import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.fluid.layers as layers
 from paddle.fluid import Program, program_guard
-import paddle.fluid.core as core
 
 
 class TestApiDataError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_data_generator.py b/python/paddle/fluid/tests/unittests/test_data_generator.py
index b804e6a96025eeba6658137c7ae066282aded7c9..02677d501e78c8faa8171ed4b9cc76eb92ac5a8d 100644
--- a/python/paddle/fluid/tests/unittests/test_data_generator.py
+++ b/python/paddle/fluid/tests/unittests/test_data_generator.py
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 import unittest
+
 import paddle.distributed.fleet as fleet
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dataloader_autotune.py b/python/paddle/fluid/tests/unittests/test_dataloader_autotune.py
index 3f35a74440a439a37e62f1ae65e5eeb5e76e9926..c94c5f54781f28d5fa15949f55c954a6daa6777e 100755
--- a/python/paddle/fluid/tests/unittests/test_dataloader_autotune.py
+++ b/python/paddle/fluid/tests/unittests/test_dataloader_autotune.py
@@ -12,16 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
+import json
+import os
+import sys
 import tempfile
+import unittest
 import warnings
-import json
+
+import numpy as np
+
 import paddle
 import paddle.nn as nn
 from paddle.io import DataLoader, Dataset
-import sys
-import os
 
 
 class RandomDataset(Dataset):
diff --git a/python/paddle/fluid/tests/unittests/test_dataloader_dataset.py b/python/paddle/fluid/tests/unittests/test_dataloader_dataset.py
index 2c4bcfa444b0fc451c5f6297d92bade56566d199..b174fd67b5872725632cc7834519e5c0059adf93 100644
--- a/python/paddle/fluid/tests/unittests/test_dataloader_dataset.py
+++ b/python/paddle/fluid/tests/unittests/test_dataloader_dataset.py
@@ -17,8 +17,8 @@ import unittest
 
 import paddle
 import paddle.vision.transforms as transforms
-from paddle.io import Dataset
 from paddle.fluid.framework import _test_eager_guard
+from paddle.io import Dataset
 
 
 class TestDatasetAbstract(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_dataloader_early_reset.py b/python/paddle/fluid/tests/unittests/test_dataloader_early_reset.py
index fa0bac6c5bda905db3ce508fb669c158355f7f8d..50f412fca0e66b5a53c22c2728fc20f2223d4366 100644
--- a/python/paddle/fluid/tests/unittests/test_dataloader_early_reset.py
+++ b/python/paddle/fluid/tests/unittests/test_dataloader_early_reset.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-import numpy as np
 import unittest
 
+import numpy as np
+
+import paddle.fluid as fluid
+
 
 def infinite_reader():
     num = 0
diff --git a/python/paddle/fluid/tests/unittests/test_dataloader_keep_order.py b/python/paddle/fluid/tests/unittests/test_dataloader_keep_order.py
index f2dd18c008082e755bec72af166c06fc991b0af1..8263edd7469eb7bd4541d1be974793fedf31d678 100644
--- a/python/paddle/fluid/tests/unittests/test_dataloader_keep_order.py
+++ b/python/paddle/fluid/tests/unittests/test_dataloader_keep_order.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
+import os
 import unittest
+
 import numpy as np
-import os
+
+import paddle.fluid as fluid
 
 
 def create_reader(shape, batch_number):
diff --git a/python/paddle/fluid/tests/unittests/test_dataloader_unkeep_order.py b/python/paddle/fluid/tests/unittests/test_dataloader_unkeep_order.py
index 8e121ba401ee22fd9f2c17241247c7a310acd66d..c8cf808526b5d3eb53f045ab8cf5c957356987f6 100644
--- a/python/paddle/fluid/tests/unittests/test_dataloader_unkeep_order.py
+++ b/python/paddle/fluid/tests/unittests/test_dataloader_unkeep_order.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
+import os
 import unittest
+
 import numpy as np
-import os
+
+import paddle.fluid as fluid
 from paddle.fluid.reader import keep_data_loader_order
 
 keep_data_loader_order(False)
diff --git a/python/paddle/fluid/tests/unittests/test_dataset.py b/python/paddle/fluid/tests/unittests/test_dataset.py
index 5c0dc9db6a24443f8d901ec034ff91814799be5d..95e252c12f41b5f0a3880e4e9096943259b9cec1 100644
--- a/python/paddle/fluid/tests/unittests/test_dataset.py
+++ b/python/paddle/fluid/tests/unittests/test_dataset.py
@@ -16,13 +16,14 @@ TestCases for Dataset,
 including create, config, run, etc.
 """
 
-import paddle
-import paddle.fluid as fluid
-import paddle.fluid.core as core
 import os
 import tempfile
 import unittest
 
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
+
 
 class TestDataset(unittest.TestCase):
     """TestCases for Dataset."""
diff --git a/python/paddle/fluid/tests/unittests/test_dataset_consistency_inspection.py b/python/paddle/fluid/tests/unittests/test_dataset_consistency_inspection.py
index 51463e7ff6287b9c4141f2d319540cf2c52502ef..63814b468245ed20807b816cec5785cc9bb60628 100644
--- a/python/paddle/fluid/tests/unittests/test_dataset_consistency_inspection.py
+++ b/python/paddle/fluid/tests/unittests/test_dataset_consistency_inspection.py
@@ -15,12 +15,13 @@
 TestCases for Dataset consistency insepection of use_var_list and data_generator.
 """
 
-import paddle
-import paddle.fluid as fluid
 import math
 import os
 import tempfile
 import unittest
+
+import paddle
+import paddle.fluid as fluid
 import paddle.fluid.incubate.data_generator as dg
 
 # paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dataset_dataloader.py b/python/paddle/fluid/tests/unittests/test_dataset_dataloader.py
index 5c7c97991d63a99f6052a55c713b33faca4062f1..3e4fc60f3acfa32ca8a8d305cfc5f767c792dded 100644
--- a/python/paddle/fluid/tests/unittests/test_dataset_dataloader.py
+++ b/python/paddle/fluid/tests/unittests/test_dataset_dataloader.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import numpy as np
 import os
-import unittest
 import tempfile
+import unittest
+
+import numpy as np
 from simple_nets import simple_fc_net_with_inputs
 
+import paddle
+import paddle.fluid as fluid
+
 BATCH_SIZE = 32
 BATCH_NUM = 10
 EPOCH_NUM = 4
diff --git a/python/paddle/fluid/tests/unittests/test_dataset_download.py b/python/paddle/fluid/tests/unittests/test_dataset_download.py
index b009a2fe58dca3a47d7fd11bde2953c1bad5820d..dc8c865c83ea74321a3f3189db27c83ce1bf2c78 100644
--- a/python/paddle/fluid/tests/unittests/test_dataset_download.py
+++ b/python/paddle/fluid/tests/unittests/test_dataset_download.py
@@ -14,7 +14,8 @@
 
 import os
 import unittest
-from paddle.dataset.common import download, DATA_HOME, md5file
+
+from paddle.dataset.common import DATA_HOME, download, md5file
 
 
 class TestDataSetDownload(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_debugger.py b/python/paddle/fluid/tests/unittests/test_debugger.py
index 23beb7f1a638b80c7d251ed7972dcc0f503874ab..37824478ca905d231294ecd59da009dc900e0743 100644
--- a/python/paddle/fluid/tests/unittests/test_debugger.py
+++ b/python/paddle/fluid/tests/unittests/test_debugger.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle.fluid.core as core
 from paddle.fluid import debugger
 from paddle.fluid.framework import Program
diff --git a/python/paddle/fluid/tests/unittests/test_decayed_adagrad_op.py b/python/paddle/fluid/tests/unittests/test_decayed_adagrad_op.py
index dae5fd7b7b787460030127d6db976837c7feb0de..b647c428a347eb3f2eedc886815f7c4fe5f2ecf4 100644
--- a/python/paddle/fluid/tests/unittests/test_decayed_adagrad_op.py
+++ b/python/paddle/fluid/tests/unittests/test_decayed_adagrad_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_decoupled_py_reader.py b/python/paddle/fluid/tests/unittests/test_decoupled_py_reader.py
index d7a5d3714317cdf94711e914e68244e12c8aa320..72ec58aa2d1ea6f3ff2b11a6ab2daa148e9264c0 100644
--- a/python/paddle/fluid/tests/unittests/test_decoupled_py_reader.py
+++ b/python/paddle/fluid/tests/unittests/test_decoupled_py_reader.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import numpy as np
 import time
 import unittest
 
+import numpy as np
+
+import paddle
+import paddle.fluid as fluid
+
 EPOCH_NUM = 5
 BATCH_SIZE = 16
 BATCH_NUM = 10
diff --git a/python/paddle/fluid/tests/unittests/test_decoupled_py_reader_data_check.py b/python/paddle/fluid/tests/unittests/test_decoupled_py_reader_data_check.py
index 90c2e84d0eef664a37f5640e9bbf0fdbd5ddd49d..1a7118cfb8279c98b7d8913572263fc29c430e0e 100644
--- a/python/paddle/fluid/tests/unittests/test_decoupled_py_reader_data_check.py
+++ b/python/paddle/fluid/tests/unittests/test_decoupled_py_reader_data_check.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-import paddle
-import numpy as np
 import unittest
 
+import numpy as np
+
+import paddle
+import paddle.fluid as fluid
+
 
 class TestClass(unittest.TestCase):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_default_dtype.py b/python/paddle/fluid/tests/unittests/test_default_dtype.py
index ca95c820a718e5cdb413b9d87f819e009ba9cc1a..ceaa9447cfcf5eac5dd0ad53fbace5a422e84dec 100644
--- a/python/paddle/fluid/tests/unittests/test_default_dtype.py
+++ b/python/paddle/fluid/tests/unittests/test_default_dtype.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from paddle.framework import set_default_dtype, get_default_dtype
+
+from paddle.framework import get_default_dtype, set_default_dtype
 
 
 class TestDefaultType(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_default_scope_funcs.py b/python/paddle/fluid/tests/unittests/test_default_scope_funcs.py
index 88686585853f5f2b069a706dc9941f22f44c4a98..c6c0e73c5d2ee6051029933fdf82d4b12263ebd9 100644
--- a/python/paddle/fluid/tests/unittests/test_default_scope_funcs.py
+++ b/python/paddle/fluid/tests/unittests/test_default_scope_funcs.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 from paddle.fluid.default_scope_funcs import (
     enter_local_scope,
     find_var,
@@ -20,7 +22,6 @@ from paddle.fluid.default_scope_funcs import (
     scoped_function,
     var,
 )
-import unittest
 
 
 class TestDefaultScopeFuncs(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_deform_conv2d.py b/python/paddle/fluid/tests/unittests/test_deform_conv2d.py
index 0bca1d051a42481354652ee829dd5229b020d3d8..304fbcf80a4f5a39284d56dd56cced4d162007d8 100644
--- a/python/paddle/fluid/tests/unittests/test_deform_conv2d.py
+++ b/python/paddle/fluid/tests/unittests/test_deform_conv2d.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+from unittest import TestCase
+
+import numpy as np
+
 import paddle
 import paddle.nn.initializer as I
-import numpy as np
-import unittest
 from paddle.fluid.framework import _test_eager_guard
-from unittest import TestCase
 
 
 class TestDeformConv2D(TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_deformable_conv_op.py b/python/paddle/fluid/tests/unittests/test_deformable_conv_op.py
index dec6d9d8dba5ee75690cd5024fed8fa918867fec..273eeeda28c23fff3087cdf11c001da7022bdabf 100644
--- a/python/paddle/fluid/tests/unittests/test_deformable_conv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_deformable_conv_op.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
 from paddle.fluid.framework import _test_eager_guard
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_deformable_conv_v1_op.py b/python/paddle/fluid/tests/unittests/test_deformable_conv_v1_op.py
index 00556f7e5a7224647c1e0c58c77992b4dd8f8649..80903fa5a6b715a836d511cb0cd6dc94b9c1b831 100644
--- a/python/paddle/fluid/tests/unittests/test_deformable_conv_v1_op.py
+++ b/python/paddle/fluid/tests/unittests/test_deformable_conv_v1_op.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
+import paddle
+
 
 def dmc_bilinear(data_im, height, width, h, w):
     h_low = int(np.floor(h))
diff --git a/python/paddle/fluid/tests/unittests/test_deformable_psroi_pooling.py b/python/paddle/fluid/tests/unittests/test_deformable_psroi_pooling.py
index 8dbe2dfa32252bea4011b216a3322753e83cee02..d73ef732da81460b9ca642e703e5805ab2901ee1 100644
--- a/python/paddle/fluid/tests/unittests/test_deformable_psroi_pooling.py
+++ b/python/paddle/fluid/tests/unittests/test_deformable_psroi_pooling.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_deg2rad.py b/python/paddle/fluid/tests/unittests/test_deg2rad.py
index 79e4541b635e1432cbf066be1c8e243706e251eb..5d6d9ac646bfc8c352bd2e9026744ea7233b9068 100644
--- a/python/paddle/fluid/tests/unittests/test_deg2rad.py
+++ b/python/paddle/fluid/tests/unittests/test_deg2rad.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_density_prior_box_op.py b/python/paddle/fluid/tests/unittests/test_density_prior_box_op.py
index 7254f9cc2f8bcecbecd55f6f2ef9145d748a36e5..9d621dc551111f5e0703079d31baba69afcf8bc7 100644
--- a/python/paddle/fluid/tests/unittests/test_density_prior_box_op.py
+++ b/python/paddle/fluid/tests/unittests/test_density_prior_box_op.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
-import math
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_deprecated_decorator.py b/python/paddle/fluid/tests/unittests/test_deprecated_decorator.py
index ae24334fea572117729ce82116f6ba1c6334045c..a41ff3e3b362f79fb8934f2728fe75a1597b078a 100755
--- a/python/paddle/fluid/tests/unittests/test_deprecated_decorator.py
+++ b/python/paddle/fluid/tests/unittests/test_deprecated_decorator.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
+import sys
+import unittest
+import warnings
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import unittest
-import sys
-import warnings
 import paddle.utils.deprecated as deprecated
 from paddle import _legacy_C_ops
 
diff --git a/python/paddle/fluid/tests/unittests/test_deprecated_memory_optimize_interfaces.py b/python/paddle/fluid/tests/unittests/test_deprecated_memory_optimize_interfaces.py
index c3a21ba0bcbb656ccbf6945e778b0f80f18045c6..22b682a0a4eb32a7634ad66c1c3dad22b9d0bc09 100644
--- a/python/paddle/fluid/tests/unittests/test_deprecated_memory_optimize_interfaces.py
+++ b/python/paddle/fluid/tests/unittests/test_deprecated_memory_optimize_interfaces.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest
+
 from simple_nets import simple_fc_net
 
+import paddle.fluid as fluid
+
 
 class DeprecatedMemoryOptimizationInterfaceTest(unittest.TestCase):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_dequantize_abs_max_op.py b/python/paddle/fluid/tests/unittests/test_dequantize_abs_max_op.py
index c4806866eff6e4bb367a493f10040a6060be12ea..0df5a3fda11c2f7134ba134e67f8537532b91355 100644
--- a/python/paddle/fluid/tests/unittests/test_dequantize_abs_max_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dequantize_abs_max_op.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
-import math
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dequantize_log_op.py b/python/paddle/fluid/tests/unittests/test_dequantize_log_op.py
index 5fb9d07d77a42e06f82152d20f0c94d6028d3e15..9db2aa6b918d15a48735c588d1b3afa9e32b1455 100644
--- a/python/paddle/fluid/tests/unittests/test_dequantize_log_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dequantize_log_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_desc_clone.py b/python/paddle/fluid/tests/unittests/test_desc_clone.py
index 6a2e831df9410861764978af37abfdc2af2dc119..5028a3e251e546193b8486cdb3670be019597c80 100644
--- a/python/paddle/fluid/tests/unittests/test_desc_clone.py
+++ b/python/paddle/fluid/tests/unittests/test_desc_clone.py
@@ -12,12 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import collections
+import functools
+import unittest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-import unittest
-import functools
-import collections
 
 SEED = 1
 DTYPE = "float32"
diff --git a/python/paddle/fluid/tests/unittests/test_detach.py b/python/paddle/fluid/tests/unittests/test_detach.py
index 48abc41e3c11c140732bd993567d1176d194de99..bd976cf39434777cc16e076be6c393e138432e77 100644
--- a/python/paddle/fluid/tests/unittests/test_detach.py
+++ b/python/paddle/fluid/tests/unittests/test_detach.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
 
 import paddle
@@ -19,8 +21,6 @@ import paddle.fluid as fluid
 from paddle.fluid.dygraph import Linear
 from paddle.fluid.dygraph.base import to_variable
 
-import unittest
-
 
 class Test_Detach(unittest.TestCase):
     def generate_Data(self):
diff --git a/python/paddle/fluid/tests/unittests/test_detection_map_op.py b/python/paddle/fluid/tests/unittests/test_detection_map_op.py
index 9cf7abf8fda0826b17bf487b9fea91c9434b418f..5578d15aab1d70fcca1104c1ec4c254f816bddf6 100644
--- a/python/paddle/fluid/tests/unittests/test_detection_map_op.py
+++ b/python/paddle/fluid/tests/unittests/test_detection_map_op.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
 import collections
 import math
+import unittest
+
+import numpy as np
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_determinant_op.py b/python/paddle/fluid/tests/unittests/test_determinant_op.py
index 730864eb23097de38cf0f765e020bf37a907d840..7eff966e60d217bc616619b9063e0465d8b783ce 100644
--- a/python/paddle/fluid/tests/unittests/test_determinant_op.py
+++ b/python/paddle/fluid/tests/unittests/test_determinant_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_device_guard.py b/python/paddle/fluid/tests/unittests/test_device_guard.py
index d1e0c383ac76b0d7ec77f94e7c0ea6f5dcfa9e08..34a029e7bac57b1dbd7038ca80dafe25c36dae66 100644
--- a/python/paddle/fluid/tests/unittests/test_device_guard.py
+++ b/python/paddle/fluid/tests/unittests/test_device_guard.py
@@ -13,11 +13,11 @@
 # limitations under the License.
 
 import unittest
+import warnings
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import warnings
 
 
 def execute(main_program, startup_program):
diff --git a/python/paddle/fluid/tests/unittests/test_diag.py b/python/paddle/fluid/tests/unittests/test_diag.py
index 4135db34218ba7c1f7af40c9cb183f28c56c3292..06969aac8f349c6b28fe43d2d9e041b0968cfab2 100644
--- a/python/paddle/fluid/tests/unittests/test_diag.py
+++ b/python/paddle/fluid/tests/unittests/test_diag.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
diff --git a/python/paddle/fluid/tests/unittests/test_diag_embed.py b/python/paddle/fluid/tests/unittests/test_diag_embed.py
index c91f5d9b86c9c72c16f572ff20b068467738e052..066ce23c5eaf57fb0fc60e9280f9f20291d5f1fa 100644
--- a/python/paddle/fluid/tests/unittests/test_diag_embed.py
+++ b/python/paddle/fluid/tests/unittests/test_diag_embed.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.nn.functional as F
+
 import paddle.fluid as fluid
 import paddle.fluid.core as core
+import paddle.nn.functional as F
 
 
 class TestDiagEmbedOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_diag_v2.py b/python/paddle/fluid/tests/unittests/test_diag_v2.py
index f1ff2b77d40411e1ed52da33a562a31bacf14b74..9c96661f6c081ff4a6a1234f43cb9109e5ab55fd 100644
--- a/python/paddle/fluid/tests/unittests/test_diag_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_diag_v2.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
diff --git a/python/paddle/fluid/tests/unittests/test_diagflat.py b/python/paddle/fluid/tests/unittests/test_diagflat.py
index f23c5051ddbbc9ec586f3a9b79837d58fafbd5ca..899589e9fd6d94fd035c3b1ec35d2a9466fd539d 100644
--- a/python/paddle/fluid/tests/unittests/test_diagflat.py
+++ b/python/paddle/fluid/tests/unittests/test_diagflat.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 from paddle.static import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_diagonal_op.py b/python/paddle/fluid/tests/unittests/test_diagonal_op.py
index bdc64827fd2a821d1f9f112e4da4d4e9fc14a0ac..5b3c3830c57ca07194c627512cd060c18cce4c31 100644
--- a/python/paddle/fluid/tests/unittests/test_diagonal_op.py
+++ b/python/paddle/fluid/tests/unittests/test_diagonal_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_diff_op.py b/python/paddle/fluid/tests/unittests/test_diff_op.py
index 4b3981075a18d2b48ce29e05619c01a2a18b14bd..7df3f779ffd847c65a3fa63e78da5cdb538d901f 100644
--- a/python/paddle/fluid/tests/unittests/test_diff_op.py
+++ b/python/paddle/fluid/tests/unittests/test_diff_op.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_digamma_op.py b/python/paddle/fluid/tests/unittests/test_digamma_op.py
index ff9e2b182759a9121d4f2e4735eb2cbf8d6d9399..3f876085dfdfcc73b91b0c89254457a95c8d8fd4 100644
--- a/python/paddle/fluid/tests/unittests/test_digamma_op.py
+++ b/python/paddle/fluid/tests/unittests/test_digamma_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
 from scipy.special import psi
+
 import paddle
 import paddle.fluid as fluid
 import paddle.static as static
-from op_test import OpTest
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_directory_migration.py b/python/paddle/fluid/tests/unittests/test_directory_migration.py
index 408ad42379e6204dae573a86c5ea5e8fa045685a..4212b73f214e8b0e9787beea230cbbe24cb8fb44 100644
--- a/python/paddle/fluid/tests/unittests/test_directory_migration.py
+++ b/python/paddle/fluid/tests/unittests/test_directory_migration.py
@@ -13,9 +13,9 @@
 # limitations under the License.
 
 import os
+import subprocess
 import sys
 import tempfile
-import subprocess
 import unittest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_disable_signal_handler.py b/python/paddle/fluid/tests/unittests/test_disable_signal_handler.py
index f0de021eaadf0ef6f43f0a4ecb2793b72117afb0..a563c53f7562234cebe0995348f3545c359ae8fb 100644
--- a/python/paddle/fluid/tests/unittests/test_disable_signal_handler.py
+++ b/python/paddle/fluid/tests/unittests/test_disable_signal_handler.py
@@ -12,9 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import signal
 import subprocess
+import unittest
 
 SignalsToTest = {
     signal.SIGTERM,
diff --git a/python/paddle/fluid/tests/unittests/test_dist_allreduce_op.py b/python/paddle/fluid/tests/unittests/test_dist_allreduce_op.py
index c2469ab92b7e5e90f44ea7f02365f73f94b8573d..62f598ee27f9438ed6316782bd4fb17c1531cdd6 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_allreduce_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_allreduce_op.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_base.py b/python/paddle/fluid/tests/unittests/test_dist_base.py
index c0f992c010bf3783ef7fde2c8e8db1546f7fb13e..57071583f1ed0d982a909d7996551682256f32af 100755
--- a/python/paddle/fluid/tests/unittests/test_dist_base.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_base.py
@@ -12,26 +12,26 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import tempfile
-
+import argparse
 import ast
-import unittest
 import os
-import sys
-import subprocess
-import argparse
 import pickle
 import random
-import numpy as np
+import subprocess
+import sys
+import tempfile
 import time
+import unittest
+
+import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import compiler
 import paddle.fluid.dygraph as dygraph
-from paddle.fluid.framework import _test_eager_guard
-from paddle.fluid.incubate.fleet.collective import fleet, DistributedStrategy
 import paddle.fluid.incubate.fleet.base.role_maker as role_maker
+from paddle.fluid import compiler
+from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.incubate.fleet.collective import DistributedStrategy, fleet
 
 RUN_STEP = 5
 DEFAULT_BATCH_SIZE = 2
diff --git a/python/paddle/fluid/tests/unittests/test_dist_dygraph_apis.py b/python/paddle/fluid/tests/unittests/test_dist_dygraph_apis.py
index aa5e1e93064fb94545ca3bfe3337167efe4e7216..073cae79eb8de99910d5bbcd637c31b2ae15bd8d 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_dygraph_apis.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_dygraph_apis.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from test_parallel_dygraph_dataparallel import TestMultipleGpus
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto.py
index 523170367fb3ce992e0b065a76fd186c01b478fa..e2f08591d705e79fcff54f01dd520c5c2519ee19 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import paddle
-import os
 import paddle.distributed.fleet.base.role_maker as role_maker
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_async.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_async.py
index a51b01209b1d7ab80abc8ea481a5cd6529a85e15..aa46502b4d234a098d47efb5ab1c0bdcf9bd63a5 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_async.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_async.py
@@ -16,6 +16,7 @@ import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
 import unittest
+
 import paddle
 import paddle.distributed.fleet.base.role_maker as role_maker
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_geo.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_geo.py
index e6f618b63a6582defc2984b77df0ae9006c8c8b6..88f3769c83efd40e7d0de932e31e105fa8f88666 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_geo.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_auto_geo.py
@@ -15,6 +15,7 @@ import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
 import unittest
+
 import paddle
 import paddle.distributed.fleet.base.role_maker as role_maker
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_geo.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_geo.py
index 05abc40a1d04184712df28a8c1c85d0e73c1a3ec..789f7ee8637855edfde47abe4f8f51985cc0e33e 100755
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_geo.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_geo.py
@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import os
-
 import unittest
+
 import paddle
 import paddle.distributed.fleet.base.role_maker as role_maker
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_sync.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_sync.py
index 837ea65d54f48be723cf3118f9298c842d0ff2cb..19c0f48e7c1a2c19cfb932378e52bd624e17b864 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_sync.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_a_sync_optimizer_sync.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import paddle
-import os
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_base.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_base.py
index eb21f925fa751ed2560923a6ea8a91998413bbfc..c84bd2b7ca6bc876c0294cf7d5e5932c129375a9 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_base.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_base.py
@@ -12,27 +12,26 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.distributed.fleet.utils.ps_util import DistributedInfer
+import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.fluid as fluid
-import paddle
+from paddle.distributed.fleet.utils.ps_util import DistributedInfer
 
 """
     high level unit test for distribute fleet.
 """
 
+import argparse
 import os
-import sys
-import subprocess
-
 import shutil
-import argparse
-from contextlib import closing
 import socket
-import time
+import subprocess
+import sys
 import tempfile
+import time
 import unittest
+from contextlib import closing
 
 import paddle
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr.py
index 33006b9d9e82c9915ade150a0c0a653d89dbb391..ac3a422dffa4b36a529852342dec8b95c694eac0 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr.py
@@ -14,6 +14,7 @@
 
 import os
 import unittest
+
 from test_dist_fleet_base import TestFleetBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr2.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr2.py
index d9c725c3a89c4886a4dd6bc6d889b42303bb8d40..623b6ed4d678553077bbb4a0b7ce32e1ce0a6e35 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr2.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ctr2.py
@@ -13,8 +13,9 @@
 # limitations under the License.
 
 import os
-import unittest
 import tempfile
+import unittest
+
 from test_dist_fleet_base import TestFleetBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_decay.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_decay.py
index 9d5ac645b6136ac8bdc6f0a30f4d3cb6c501f88b..21284d69353476f5d7f6e102a2d98ec7d8546d09 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_decay.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_decay.py
@@ -12,11 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.fluid as fluid
-import unittest
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_geo.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_geo.py
index 2e63a28cd247840de4a28f26d5ceefb6648451c0..da24daebd88c0bbca9536cabd1cdecf47939ad12 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_geo.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_geo.py
@@ -16,13 +16,14 @@ import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
 import unittest
+
+from dist_fleet_simnet_bow import train_network
+from test_dist_fleet_base import TestFleetBase
+
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
-
-from test_dist_fleet_base import TestFleetBase
-from dist_fleet_simnet_bow import train_network
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_gloo.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_gloo.py
index dd31dc8ef0db86a892433cff4d399c507390d3c5..7b35ec169f5a22a4ac0b4ca9ec56ac2c5bf7a31b 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_gloo.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_gloo.py
@@ -14,10 +14,10 @@
 
 import os
 import shutil
-import tempfile
-import unittest
 import subprocess
+import tempfile
 import time
+import unittest
 
 # import paddle.fluid.incubate.fleet.base.role_maker as role_maker
 from test_dist_fleet_base import TestFleetBase
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_base.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_base.py
index 6871580b27021b8bf3ebcfa505a3a163cc66ffba..61f2ea0d6b9a32b1e4508bf894bc73604e940e4a 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_base.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_base.py
@@ -15,22 +15,21 @@
     high level unit test for distribute fleet.
 """
 
+import argparse
 import os
-import sys
-import subprocess
-
 import shutil
-import argparse
-from contextlib import closing
 import socket
-import time
+import subprocess
+import sys
 import tempfile
+import time
 import unittest
+from contextlib import closing
 
 import paddle
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 __all__ = ['FleetDistHeterRunnerBase', 'TestFleetHeterBase', 'runtime_main']
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_program.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_program.py
index 199594f24a88f8b131ceaf7515321fd5b68648af..477d9091d7a51bd30edb4a8389ab28f31d375d28 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_program.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_heter_program.py
@@ -12,14 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
+import os
 import unittest
+
 import paddle
-import os
-import math
-import paddle.fluid as fluid
 import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_infer.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_infer.py
index c0c7070cf803bf61ff2a1e7899581a91b31b4603..184209f25e7c623abb5715de13cc307cacb8ecac 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_infer.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_infer.py
@@ -14,8 +14,9 @@
 
 import os
 import shutil
-import unittest
 import tempfile
+import unittest
+
 from test_dist_fleet_base import TestFleetBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps.py
index a63d0912c3ec102eac5ee30bf9952c1171d85b1c..685f8dd0e4c10c0d37c436dae51410a9239be1cc 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps.py
@@ -18,9 +18,9 @@ import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 # For Net
 base_lr = 0.2
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps10.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps10.py
index db553b990343b2c216cca549ef362c650e5b99f4..833c9f8e16213896080c1afb19e4778dfc9fd293 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps10.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps10.py
@@ -15,11 +15,12 @@
 import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
-import paddle.distributed.fleet as fleet
 import unittest
+
 import paddle
+import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps11.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps11.py
index 8828dd2cfafdfa66830b8f230ec56946d5df030e..cea69f92e69213c92c73001662db80d9e4b9262f 100755
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps11.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps11.py
@@ -16,9 +16,9 @@ import os
 import unittest
 
 import paddle
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps12.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps12.py
index 9c752cd3d0daca79c280ec08706eca6fad1fccc4..f56335454640a3dfa9b8394c5ff816a32644ffa4 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps12.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps12.py
@@ -19,9 +19,9 @@ os.environ["WITH_DISTRIBUTE"] = "ON"
 import unittest
 
 import paddle
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps13.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps13.py
index 5d6c3bee7f27da8e21c1bf95519c85dade551d5f..107488e771f3c4cb0f75ffe5e836e3a002d50e15 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps13.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps13.py
@@ -19,9 +19,9 @@ os.environ["WITH_DISTRIBUTE"] = "ON"
 import unittest
 
 import paddle
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps2.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps2.py
index 30f3f8134889c0046b56d41f4097e8bfacecb111..2afaa2bf4725701b1176c4a121e25679141c9811 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps2.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps2.py
@@ -19,9 +19,9 @@ os.environ["WITH_DISTRIBUTE"] = "ON"
 import unittest
 
 import paddle
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps3.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps3.py
index 39634ebc4f31a6b091e33f6aa99d8912725541fa..9cc5b947f67268b3a02cea146d19434af6d9ad85 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps3.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps3.py
@@ -18,9 +18,9 @@ import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 # For Net
 base_lr = 0.2
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps4.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps4.py
index b7ac497721c7e4e7892968ca5f25880e8c93f56f..751f0c70b8da2ba84bf346391bfcbbd5401e1edd 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps4.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps4.py
@@ -18,9 +18,9 @@ import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 # For Net
 base_lr = 0.2
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps5.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps5.py
index 668d31ee854ba3e0d9e4f81b37be7be512896083..0b00a97a3449211c1f28fd705eff83325a814578 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps5.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps5.py
@@ -18,9 +18,9 @@ import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 # For Net
 base_lr = 0.2
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps6.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps6.py
index b85540f2d9279688588d6dfaf19b99b4808a0c4d..f90b08c3f3387f1ddeef0e0a7e27bf8a710ad3ff 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps6.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps6.py
@@ -18,9 +18,9 @@ import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 
 # For Net
 base_lr = 0.2
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps7.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps7.py
index 9351791260b2af9ba84d6e5abc30c7cb078a81ad..838a9a10719318ecb9c2b5903b644ef6617f24ba 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps7.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps7.py
@@ -16,11 +16,12 @@ import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
 
+import unittest
+
+import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.fluid as fluid
-import unittest
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps8.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps8.py
index cbf12f19714ff5ead1cc75380e4b8f9c563344f9..e203fc34803c29c322bb1ab83eccdeeb31a09e09 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps8.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps8.py
@@ -15,11 +15,12 @@
 import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
+import unittest
+
+import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.fluid as fluid
-import unittest
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps9.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps9.py
index bebc6bbb96536af1ad9f1e54d32cc8d1c54413b4..67149d458fcb1aa6515e01719eeeb12c9b27a4ee 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_ps9.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_ps9.py
@@ -15,11 +15,12 @@
 import os
 
 os.environ["WITH_DISTRIBUTE"] = "ON"
+import unittest
+
+import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.fluid as fluid
-import unittest
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer.py
index ca3c5badc0922e1c0a2977555efd5445726750c9..ef90a541cc9783233c959400f3c1f65c32a612e1 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
-import os
 
 paddle.enable_static()
 flag_name = os.path.splitext(__file__)[0]
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer_fuse_allreduce.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer_fuse_allreduce.py
index a6b994dde6d785a569f6bf01f3e3e8bccac75fc7..2a401beb4ac55efb94d8dbe1189e2ab96d02cd33 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer_fuse_allreduce.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_raw_program_optimizer_fuse_allreduce.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
-import os
 
 paddle.enable_static()
 flag_name = os.path.splitext(__file__)[0]
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_simnet.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_simnet.py
index 27c76bee6ed9c233401987e23a2fcaea37bb3f74..3d31b391de982a0b8e5a0d17b43c5529b14486e6 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_simnet.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_simnet.py
@@ -14,7 +14,9 @@
 
 import os
 import unittest
+
 from test_dist_fleet_base import TestFleetBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_fleet_sparse_embedding_ctr.py b/python/paddle/fluid/tests/unittests/test_dist_fleet_sparse_embedding_ctr.py
index 13eaa703ddc0c7b20267f8c95f18ab280481c6b4..87d1b12a3a5b5bcb82ad099a28f7ed36fd5c1184 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_fleet_sparse_embedding_ctr.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_fleet_sparse_embedding_ctr.py
@@ -16,14 +16,15 @@ import os
 import shutil
 import tempfile
 import unittest
+
 import paddle
 
 paddle.enable_static()
 
-import paddle.fluid as fluid
-
-from test_dist_fleet_base import TestFleetBase
 from dist_fleet_sparse_embedding_ctr import fake_ctr_reader
+from test_dist_fleet_base import TestFleetBase
+
+import paddle.fluid as fluid
 
 
 @unittest.skip(reason="Skip unstable ut, need paddle sync mode fix")
diff --git a/python/paddle/fluid/tests/unittests/test_dist_lookup_sparse_table_fuse_ops.py b/python/paddle/fluid/tests/unittests/test_dist_lookup_sparse_table_fuse_ops.py
index f64a7e6882e12fde9f643deba68e745fe9cbc386..023d5c3a5cf8b29c1893b03629d98b3ba34bbed7 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_lookup_sparse_table_fuse_ops.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_lookup_sparse_table_fuse_ops.py
@@ -13,13 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 
-import paddle
-
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_backward_deps.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_backward_deps.py
index ba1037b05730c4cdb8342e9a97e8b420c395a51e..55379b2ab54d25437c2afd31534f66c12116c96a 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_backward_deps.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_backward_deps.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_batch_merge.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_batch_merge.py
index a480b987317557d7837fc79a59b6dab6a96fd0da..c24e550f49f1becde68d465a85513ff79f3a0a09 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_batch_merge.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_batch_merge.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 from test_dist_base import TestDistBase
-import os
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_fleet_save.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_fleet_save.py
index 9a1afd250d8ef857c23b60146f405574c4937491..ffe327c1c61a97ba0e347dd2dbf914b4e754dfec 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_fleet_save.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_fleet_save.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import shutil
 import os
+import shutil
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_fleetapi.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_fleetapi.py
index fbfdccfeff41cb129521049d48bb3dd8a8296a2a..00774eff964fa4fe712811f77628adae41b344b3 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_fleetapi.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_fleetapi.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
@@ -45,8 +47,8 @@ class FleetCollectiveTest(unittest.TestCase):
         import paddle.fluid as fluid
         import paddle.fluid.incubate.fleet.base.role_maker as role_maker
         from paddle.fluid.incubate.fleet.collective import (
-            fleet,
             DistributedStrategy,
+            fleet,
         )
 
         if not fluid.core.is_compiled_with_cuda():
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_fp16_allreduce.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_fp16_allreduce.py
index ce74d92a7b81af2ca73e2e9e793554e3c621294e..37d0130d2f5aef70713fbec769af50dc6983f102 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_fp16_allreduce.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_fp16_allreduce.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_hallreduce.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_hallreduce.py
index ca1b7299b8c63df418b6e254a4cc31c7bd57dc5a..46da80eb49cbb150090529b0fddb084ea9647884 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_hallreduce.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_hallreduce.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 from test_dist_base import TestDistBase
 
-import os
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_lars.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_lars.py
index 81b96e7c8991cd7d5c3521b357b66f532e543d99..f72d9108598fab8da6c2a58cc632610c51377b4d 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_lars.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_lars.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_multi_comm.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_multi_comm.py
index 82f09bcfae1d0120f42de0c7e1205a52ee5166c7..46a047806d376255abcbec2f80938f8ac7657022 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_multi_comm.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_multi_comm.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 from test_dist_base import TestDistBase
 
-import os
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_pg.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_pg.py
index e517e38978e48f1ff5737f109278bd8347c0a425..f7ae4755d689b84f2ed6f2382de770ec72c6a06a 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_pg.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_pg.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_ring_allreduce.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_ring_allreduce.py
index 40ae6686ed98ce8c18d672f39c53ba216543d9c7..de913897b70fa04ba6f83a441e07c5ec6ebd10e7 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_ring_allreduce.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_ring_allreduce.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_train.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_train.py
index f6dfa739846605580c418ccf99f4ef00522303ce..357aada7def5351235ea5233d4ca24592eaee31e 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_train.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_train.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
-from test_dist_base import TestDistBase
 
-import os
+from test_dist_base import TestDistBase
 
 flag_name = os.path.splitext(__file__)[0]
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist_with_program.py b/python/paddle/fluid/tests/unittests/test_dist_mnist_with_program.py
index 83c9a340e32cb0bca1450a036eeb4e6b42684a71..754efe54730bbcb1e2fe68c4878e05f0a875d16b 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist_with_program.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist_with_program.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_op.py b/python/paddle/fluid/tests/unittests/test_dist_op.py
index e627567b1afd9adf05428a8e3382582572823153..f99a416a6630e1984ba828e75c3da3f9d0507399 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_dist_save_load.py b/python/paddle/fluid/tests/unittests/test_dist_save_load.py
index d4de87866227fc63b911bec13320fc09fc26754a..9eeaf376a5e0cf2aa94460baf7518e437e0a5479 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_save_load.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_save_load.py
@@ -14,15 +14,12 @@
 
 import os
 import shutil
-import unittest
 import tempfile
+import unittest
 
 import numpy as np
-
 from test_dist_base import TestDistBase
 
-import os
-
 flag_name = os.path.splitext(__file__)[0]
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_se_resnext_nccl.py b/python/paddle/fluid/tests/unittests/test_dist_se_resnext_nccl.py
index 35ffbbb80ca04367210c52d3d867e9f39b2e8e31..e68cbf34b4fe9f289b100627201bf531bda5c972 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_se_resnext_nccl.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_se_resnext_nccl.py
@@ -12,11 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 from test_dist_base import TestDistBase
-import os
 
-import os
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_se_resnext_sync.py b/python/paddle/fluid/tests/unittests/test_dist_se_resnext_sync.py
index cc5905506e6d0714ff5de3d6bbb50ef59f4b0cc9..6a00d41a6c2cf5f0c7edb1613ea0f2589279f86d 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_se_resnext_sync.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_se_resnext_sync.py
@@ -12,11 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-from test_dist_base import TestDistBase
 import os
+import unittest
 
-import os
+from test_dist_base import TestDistBase
 
 flag_name = os.path.splitext(__file__)[0]
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sharding_save.py b/python/paddle/fluid/tests/unittests/test_dist_sharding_save.py
index 29442a9fb6838932ba1702b20015b3094478cdd6..0d06777c8b6edeed9ded07e70f5c0c316f9cb6d6 100755
--- a/python/paddle/fluid/tests/unittests/test_dist_sharding_save.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sharding_save.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import shutil
 import os
+import shutil
 import unittest
+
 from test_dist_base import TestDistBase
+
 import paddle
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps0.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps0.py
index f79afcca3de8882aa12ece23aa85c9d17ba98edb..75f076ae7ce7afa58ebd16f47244babc468f6a4f 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps0.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps0.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import os
+import shutil
+import tempfile
 import unittest
+
 import numpy as np
-import tempfile
-import shutil
+
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps1.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps1.py
index 1152ff3e82b2073935b851a1fdc9a8cfaad6662c..2b9f9ee54434ad372a9de78b52c4b0fda5ee7b87 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps1.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_load_ps1.py
@@ -13,14 +13,16 @@
 # limitations under the License.
 
 import os
+import shutil
 import unittest
+
 import numpy as np
-import shutil
+from test_dist_sparse_load_ps0 import SparseLoadOp
+
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-from test_dist_sparse_load_ps0 import SparseLoadOp
 
 
 @unittest.skip(reason="Skip unstable ut, need rewrite with new implement")
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adagrad.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adagrad.py
index 5fca7c3afa7b700788b9b8c95762090679351d92..e1fae30ddab28e134f8f3e7e591709aa55b0edd5 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adagrad.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adagrad.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
+from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
+
 import paddle
 import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
 
 
 class TestSparseLoadProgramAdagrad(TestSparseLoadProgram):
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adam.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adam.py
index 8305ade7b3e981b11841eda0fcee4e64ded88e5f..bebe9dab7604cdb0cdffefe3c3d7b1c44f352b26 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adam.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_adam.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
+from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
+
 import paddle
 import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
 
 
 class TestSparseLoadProgramAdam(TestSparseLoadProgram):
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_ftrl.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_ftrl.py
index 8193e20037a38730619f99848bc43ab7ae33adb4..c267e84d27973129a86f480d997b1c977812f1e6 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_ftrl.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_ftrl.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
+from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
+
 import paddle
 import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
 
 
 class TestSparseLoadProgramFtrl(TestSparseLoadProgram):
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_momentum.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_momentum.py
index 83fc785bddd9f887e6a351b70bece31809593c42..02108196f08f19d7b6673cbe539c2dcb235299e8 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_momentum.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_momentum.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
+from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
+
 import paddle
 import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
 
 
 class TestSparseLoadProgramMomentum(TestSparseLoadProgram):
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_rmsprop.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_rmsprop.py
index 049a9043cf1a231d68d23e99afa81ff2953a8b5d..f0005e894ee6d0fd357ee3d71df7105dd5af9bca 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_rmsprop.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_rmsprop.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
+from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
+
 import paddle
 import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
-from test_dist_sparse_tensor_load_sgd import TestSparseLoadProgram
 
 
 class TestSparseLoadProgramRmsprop(TestSparseLoadProgram):
diff --git a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_sgd.py b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_sgd.py
index 42737d3d69b4f1f1c3130b04ff47c31434042c45..0c2073e3b72b07e20831571c9a539fd6ac9d856a 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_sgd.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_sparse_tensor_load_sgd.py
@@ -14,9 +14,10 @@
 
 import os
 import unittest
+
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed.fleet.base.role_maker as role_maker
+import paddle.fluid as fluid
 from paddle.distributed.fleet import fleet
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_text_classification.py b/python/paddle/fluid/tests/unittests/test_dist_text_classification.py
index 36215f4e26c487c824dd64df981c5c7f175d64e7..f777775724aee0bfef0bf0047d008625a30381d8 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_text_classification.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_text_classification.py
@@ -14,9 +14,8 @@
 
 import os
 import unittest
-from test_dist_base import TestDistBase
 
-import os
+from test_dist_base import TestDistBase
 
 flag_name = os.path.splitext(__file__)[0]
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_train.py b/python/paddle/fluid/tests/unittests/test_dist_train.py
index 3067321289b9cf1eae8d8972745a951a989a322c..5fa4f87f95a3240dc92260629c7ce660cad6cd42 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_train.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_train.py
@@ -13,23 +13,20 @@
 # limitations under the License.
 
 import os
+import signal
 import time
 import unittest
 from multiprocessing import Process
-import signal
 
 import numpy as np
+from dist_test_utils import remove_ps_flag
 
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-from paddle.fluid.layers.io import ListenAndServ
-from paddle.fluid.layers.io import Recv
-from paddle.fluid.layers.io import Send
 import paddle.fluid.layers.ops as ops
-from dist_test_utils import remove_ps_flag
-
 from paddle.fluid import core
-import paddle
+from paddle.fluid.layers.io import ListenAndServ, Recv, Send
 
 RPC_OP_ROLE_ATTR_NAME = (
     op_role_attr_name
diff --git a/python/paddle/fluid/tests/unittests/test_dist_transformer.py b/python/paddle/fluid/tests/unittests/test_dist_transformer.py
index 470468f7fe3a15c3024bf8640de3f4194cc3c12a..6ccebe309df209de2badbe5c37396cc40fee08c1 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_transformer.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_transformer.py
@@ -14,9 +14,11 @@
 
 import os
 import unittest
-import paddle
+
 from test_dist_base import TestDistBase
 
+import paddle
+
 
 def download_files():
     url_prefix = 'http://paddle-unittest-data.bj.bcebos.com/dist_transformer/'
diff --git a/python/paddle/fluid/tests/unittests/test_dist_transpiler.py b/python/paddle/fluid/tests/unittests/test_dist_transpiler.py
index 2c53d27efa01710f0cea5a1bdfad15a2adb133d5..cdeb7619e7b9d8a1f15cb19372d0e0a182e9de99 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_transpiler.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_transpiler.py
@@ -12,13 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import math
-
 import functools
+import gc
+import math
 import unittest
-import numpy as np
 
-import gc
+import numpy as np
 
 gc.set_debug(gc.DEBUG_COLLECTABLE)
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_tree_index.py b/python/paddle/fluid/tests/unittests/test_dist_tree_index.py
index d3d3d249c41254704312ebe9cd33fff4ca33a297..f08080018ea845030e9821c26f8b9a4a5c392fc5 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_tree_index.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_tree_index.py
@@ -15,10 +15,11 @@
 import os
 import tempfile
 import unittest
+
+import paddle
+import paddle.fluid as fluid
 from paddle.dataset.common import download
 from paddle.distributed.fleet.dataset import TreeIndex
-import paddle.fluid as fluid
-import paddle
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_dist_word2vec.py b/python/paddle/fluid/tests/unittests/test_dist_word2vec.py
index be100d7699f0ff0d94f077017b4657d36f16e6d8..bfdfb8c071b02c00f7d5e5fa3e12fa0f9cd47a6a 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_word2vec.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_word2vec.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
-from test_dist_base import TestDistBase
 
-import os
+from test_dist_base import TestDistBase
 
 flag_name = os.path.splitext(__file__)[0]
 
diff --git a/python/paddle/fluid/tests/unittests/test_distribute_fpn_proposals_op.py b/python/paddle/fluid/tests/unittests/test_distribute_fpn_proposals_op.py
index 354a630bc3847a8a5c3d26fa6a1537e28cc52ae8..afb053c3be538156ddcf05c14676136cb239637b 100644
--- a/python/paddle/fluid/tests/unittests/test_distribute_fpn_proposals_op.py
+++ b/python/paddle/fluid/tests/unittests/test_distribute_fpn_proposals_op.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
-import paddle
 
+import numpy as np
 from op_test import OpTest
 
+import paddle
+
 
 def distribute_fpn_proposals_wrapper(
     fpn_rois,
diff --git a/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_clip.py b/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_clip.py
index 7638f7cf2436fc28d763839455d7f04d5d75522b..431f9632441571945432ca0a39720e6aaf14d597 100644
--- a/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_clip.py
+++ b/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_clip.py
@@ -14,11 +14,12 @@
 
 import os
 import shlex
-import sys
 import shutil
+import sys
+import tempfile
 import unittest
+
 import paddle
-import tempfile
 
 
 def get_test_file():
diff --git a/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_gradient_merge.py b/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_gradient_merge.py
index 37b315e61a808aeee593b7f188551c8e8b5d2b7b..0c7096f5dae1a0a699abf089b9ad582104bb13d6 100644
--- a/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_gradient_merge.py
+++ b/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_with_gradient_merge.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from test_distributed_fused_lamb_op_with_clip import run_test
 import unittest
 
+from test_distributed_fused_lamb_op_with_clip import run_test
+
 
 class TestDistributedFusedLambGradientMerge(unittest.TestCase):
     def test_gm(self):
diff --git a/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_without_clip.py b/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_without_clip.py
index 6e9d8ddea172879eb5b61c9cf130df2004740635..695898355798282b92e8e27f6e6ebe354f5bbf9f 100644
--- a/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_without_clip.py
+++ b/python/paddle/fluid/tests/unittests/test_distributed_fused_lamb_op_without_clip.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from test_distributed_fused_lamb_op_with_clip import run_test
 import unittest
 
+from test_distributed_fused_lamb_op_with_clip import run_test
+
 
 class TestDistributedFusedLambWithoutClip(unittest.TestCase):
     def test_1(self):
diff --git a/python/paddle/fluid/tests/unittests/test_distributions.py b/python/paddle/fluid/tests/unittests/test_distributions.py
index a032b74f796bd1452fdc7917fcdf06b4fa1c827d..df8fe980e88433c2833aa8e5d89efa9fed82d6d3 100644
--- a/python/paddle/fluid/tests/unittests/test_distributions.py
+++ b/python/paddle/fluid/tests/unittests/test_distributions.py
@@ -12,8 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
+import math
 import unittest
+
+import numpy as np
+
 from paddle import fluid
 from paddle.fluid import layers
 from paddle.fluid.layers.distributions import (
@@ -22,7 +25,6 @@ from paddle.fluid.layers.distributions import (
     Normal,
     Uniform,
 )
-import math
 
 
 class DistributionNumpy:
diff --git a/python/paddle/fluid/tests/unittests/test_dot_op.py b/python/paddle/fluid/tests/unittests/test_dot_op.py
index 006c91d60e64b1274533a411371ce7b45f41de07..55460c2f14b9d6dc10a802adedf8b70d4b8dcbb4 100644
--- a/python/paddle/fluid/tests/unittests/test_dot_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dot_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import paddle.fluid.core as core
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_downpoursgd.py b/python/paddle/fluid/tests/unittests/test_downpoursgd.py
index 6626f0ebfa0478c4b1d580c8d9b77b4b8fc432bd..556bdda232a2bfacc81e370e08c8264cf32d3fa6 100644
--- a/python/paddle/fluid/tests/unittests/test_downpoursgd.py
+++ b/python/paddle/fluid/tests/unittests/test_downpoursgd.py
@@ -13,17 +13,19 @@
 # limitations under the License.
 """Test cases for Downpour."""
 
-import paddle
-import paddle.fluid as fluid
 import os
-import unittest
 import sys
+import unittest
+
+from google.protobuf import text_format
+
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.incubate.fleet.parameter_server.pslib.ps_pb2 as pslib
 from paddle.fluid.incubate.fleet.parameter_server.pslib.node import (
-    DownpourWorker,
     DownpourServer,
+    DownpourWorker,
 )
-from google.protobuf import text_format
-import paddle.fluid.incubate.fleet.parameter_server.pslib.ps_pb2 as pslib
 from paddle.fluid.trainer_factory import TrainerFactory
 
 cache_path = os.path.expanduser('~/.cache/paddle/dataset')
diff --git a/python/paddle/fluid/tests/unittests/test_dpsgd_op.py b/python/paddle/fluid/tests/unittests/test_dpsgd_op.py
index 2e505c05a891f419064b4faacf15a531d77d8865..6a18b7a8913b01b74c7ca173a303250aea822683 100644
--- a/python/paddle/fluid/tests/unittests/test_dpsgd_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dpsgd_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_dropout_nd_op.py b/python/paddle/fluid/tests/unittests/test_dropout_nd_op.py
index e19a0104de38d9d339874f2136808b0000612705..c4e01fb6e4c048589fb9641fc8878fabacb459a1 100644
--- a/python/paddle/fluid/tests/unittests/test_dropout_nd_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dropout_nd_op.py
@@ -13,16 +13,18 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.framework import _non_static_mode
 from paddle import _legacy_C_ops
-from paddle.static import default_main_program
 from paddle.fluid.data_feeder import check_variable_and_dtype
+from paddle.fluid.framework import _non_static_mode
+from paddle.fluid.layer_helper import LayerHelper
+from paddle.static import default_main_program
 
 
 def dropout_nd(
diff --git a/python/paddle/fluid/tests/unittests/test_dropout_op.py b/python/paddle/fluid/tests/unittests/test_dropout_op.py
index 862ca0c1f9135ac1c574b4b3fe1b746a5a6d204d..6c886acea0d8b210a47368d0ca0baea91e7b7d1e 100644
--- a/python/paddle/fluid/tests/unittests/test_dropout_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dropout_op.py
@@ -13,16 +13,17 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-from op_test import OpTest, skip_check_grad_ci, convert_float_to_uint16
+from op_test import OpTest, convert_float_to_uint16, skip_check_grad_ci
+
 import paddle
-import paddle.static as static
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
-from paddle.fluid.framework import _test_eager_guard, _enable_legacy_dygraph
-
+import paddle.fluid.core as core
+import paddle.static as static
 from paddle import _C_ops
+from paddle.fluid import Program, program_guard
+from paddle.fluid.framework import _enable_legacy_dygraph, _test_eager_guard
 
 
 class TestDropoutOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_dygraph_mnist_fp16.py b/python/paddle/fluid/tests/unittests/test_dygraph_mnist_fp16.py
index f96595588c3dbc264f8a18f76a35c06c6c04e132..204361fc92d8b8a8012f7a3bd8fb42c7d17ae235 100644
--- a/python/paddle/fluid/tests/unittests/test_dygraph_mnist_fp16.py
+++ b/python/paddle/fluid/tests/unittests/test_dygraph_mnist_fp16.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid.dygraph.nn import Pool2D, Linear
+from paddle.fluid.dygraph.nn import Linear, Pool2D
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dygraph_mode_of_unittest.py b/python/paddle/fluid/tests/unittests/test_dygraph_mode_of_unittest.py
index 8da813c00ef447c65ab737b6f048b0e12c3c91e0..82eb7256b7cef2f9af3515c6d945b57796183d5c 100644
--- a/python/paddle/fluid/tests/unittests/test_dygraph_mode_of_unittest.py
+++ b/python/paddle/fluid/tests/unittests/test_dygraph_mode_of_unittest.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_dygraph_multi_forward.py b/python/paddle/fluid/tests/unittests/test_dygraph_multi_forward.py
index 08bb8fceb4fa40ce7556b8905f9fee42386ea2e4..3c099642553035c124f563584437c64af75f0e69 100644
--- a/python/paddle/fluid/tests/unittests/test_dygraph_multi_forward.py
+++ b/python/paddle/fluid/tests/unittests/test_dygraph_multi_forward.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from paddle.fluid.optimizer import SGDOptimizer
-from paddle.fluid.dygraph.nn import Pool2D, Linear
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
+from paddle.fluid.dygraph.nn import Linear, Pool2D
+from paddle.fluid.optimizer import SGDOptimizer
 
 SEED = 123123111
 
diff --git a/python/paddle/fluid/tests/unittests/test_dygraph_spectral_norm.py b/python/paddle/fluid/tests/unittests/test_dygraph_spectral_norm.py
index b8968d3fdd01c0c74ebc3ccb36a7dfc5c6801265..86acc30b47715a9f311f6857bc3a995f9e718861 100644
--- a/python/paddle/fluid/tests/unittests/test_dygraph_spectral_norm.py
+++ b/python/paddle/fluid/tests/unittests/test_dygraph_spectral_norm.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import collections
 import unittest
+
 import numpy as np
-import collections
+
 import paddle
 import paddle.nn as nn
 from paddle.nn.utils import spectral_norm
diff --git a/python/paddle/fluid/tests/unittests/test_dygraph_weight_norm.py b/python/paddle/fluid/tests/unittests/test_dygraph_weight_norm.py
index 1a3e4a2e7b5103c42e45f26f75903925418f6f47..f277a7fb7c5c3b5048a3e5b40bb05e64d500f483 100644
--- a/python/paddle/fluid/tests/unittests/test_dygraph_weight_norm.py
+++ b/python/paddle/fluid/tests/unittests/test_dygraph_weight_norm.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
 import collections
+import unittest
 from functools import reduce
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-from paddle.nn.utils import weight_norm, remove_weight_norm
+from paddle.nn.utils import remove_weight_norm, weight_norm
 
 
 class TestDygraphWeightNorm(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_dynamic_rnn_stop_gradient.py b/python/paddle/fluid/tests/unittests/test_dynamic_rnn_stop_gradient.py
index fff63bcb0057eecf5f0d0d2cd427abcb03eb1ab7..bea1473ac78fe4ddf5066d894f768ef8d03e219b 100644
--- a/python/paddle/fluid/tests/unittests/test_dynamic_rnn_stop_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_dynamic_rnn_stop_gradient.py
@@ -12,12 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import unittest
-import paddle
 
 
 def build_and_run_program(place, batch_size, beam_size, stop_gradient=False):
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_conditional_block.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_conditional_block.py
index aa28b5886c094e72ac4731e6828357d596e47b56..4f89a3691d6099c59ead4163ea9860c6a9b6f5ec 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_conditional_block.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_conditional_block.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest
 
+import paddle.fluid as fluid
+
 fluid.core._set_eager_deletion_mode(0.0, 1.0, True)
 
 if __name__ == '__main__':
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_delete_vars.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_delete_vars.py
index 684322c529265e557d8147f51d9ba7f97744ad37..d3ea6fd4f4f5f61a88f2441ddb21bf46ba946e8b 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_delete_vars.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_delete_vars.py
@@ -13,17 +13,18 @@
 # limitations under the License.
 
 import os
+
 import numpy as np
 
 os.environ['FLAGS_use_mkldnn'] = '0'
 os.environ['CPU_NUM'] = '4'
 
-import paddle.fluid as fluid
-import unittest
 import multiprocessing
+import unittest
 from functools import reduce
 
 import paddle
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_dynamic_rnn_base.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_dynamic_rnn_base.py
index 86952d74e397b4d943c3e84639141e05d7b31ce5..f9294f152dcdedf7439c7b2220cc1c02a4c55a94 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_dynamic_rnn_base.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_dynamic_rnn_base.py
@@ -18,11 +18,12 @@ os.environ['CPU_NUM'] = '2'
 
 import unittest
 
+from fake_reader import fake_imdb_reader
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import compiler
-from fake_reader import fake_imdb_reader
 
 
 def train(network, use_cuda, use_parallel_executor, batch_size=32, pass_num=2):
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_gru_net.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_gru_net.py
index c28ece138fb41c05c7a6eeed3c78d2e08d1f1303..b5dff40cb3d2681d9689e2cd1a2cdf7a40fa3d58 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_gru_net.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_gru_net.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 from test_eager_deletion_dynamic_rnn_base import TestBase
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_lstm_net.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_lstm_net.py
index 998872f0acf21a20af84b6501cd3249e2d7cfb52..3cd7c681adc72c22f7f3adf9ae2ab956c4baec09 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_lstm_net.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_lstm_net.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 from test_eager_deletion_dynamic_rnn_base import TestBase
+
 import paddle
 import paddle.fluid as fluid
-import unittest
 
 fluid.core._set_eager_deletion_mode(0.0, 1.0, True)
 
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_mnist.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_mnist.py
index 89d1d769be3324c00716b7c890c5d8ecaaf4fff3..f9344e9f823cd18f865a2397ced58307c820433b 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_mnist.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_mnist.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle.fluid as fluid
 
 fluid.core._set_eager_deletion_mode(0.0, 1.0, True)
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_padding_rnn.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_padding_rnn.py
index c0a6ad983b1c738819f6652427f158f68253f82e..66bf53c8a902d5f049c9646cac16e479070e31ee 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_padding_rnn.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_padding_rnn.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import os
-
 from paddle.fluid import ParamAttr
 from paddle.fluid.contrib.layers import basic_lstm
 from paddle.fluid.executor import Executor
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_recurrent_op.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_recurrent_op.py
index d9fef7d73642fe486c34e054526dd37cfe3350f4..e044071e43d88eb3ffd03feefd5ddf9cc0c709bd 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_recurrent_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_recurrent_op.py
@@ -13,17 +13,18 @@
 # limitations under the License.
 
 import os
+import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.layers as layers
-import unittest
-
 from paddle.fluid import ParamAttr
-from paddle.fluid.framework import Program, grad_var_name
-from paddle.fluid.executor import Executor
 from paddle.fluid.backward import append_backward
-import paddle
+from paddle.fluid.executor import Executor
+from paddle.fluid.framework import Program, grad_var_name
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_eager_deletion_while_op.py b/python/paddle/fluid/tests/unittests/test_eager_deletion_while_op.py
index 8c359a39195e3722427a464d8e0f52ffd6430c95..d61e6a6f078b383aad933620587ab2cf98330b55 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_deletion_while_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_deletion_while_op.py
@@ -16,16 +16,17 @@ import os
 
 os.environ['CPU_NUM'] = '2'
 
+import multiprocessing
 import unittest
-import paddle.fluid as fluid
-import paddle.fluid.layers as layers
-from paddle.fluid.executor import Executor
-import paddle.fluid.core as core
-import paddle.fluid.compiler as compiler
+
 import numpy
-import multiprocessing
 
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.compiler as compiler
+import paddle.fluid.core as core
+import paddle.fluid.layers as layers
+from paddle.fluid.executor import Executor
 
 paddle.enable_static()
 fluid.core._set_eager_deletion_mode(0.0, 1.0, True)
diff --git a/python/paddle/fluid/tests/unittests/test_eager_run_program.py b/python/paddle/fluid/tests/unittests/test_eager_run_program.py
index 847bdc3d1a8fc3374ffe52954538108e6a961fec..c52599b87d6ae7a005ecb79224be73eacf579f6e 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_run_program.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_run_program.py
@@ -12,23 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
+import unittest
+
 import numpy as np
+
+import paddle
 from paddle import _legacy_C_ops
-from paddle.fluid.framework import (
-    _test_eager_guard,
-    Variable,
-    _in_legacy_dygraph,
-)
 from paddle.fluid import core
-from paddle.fluid.layers.utils import _hash_with_id
 from paddle.fluid.dygraph.base import switch_to_static_graph
 from paddle.fluid.executor import (
-    _is_enable_standalone_executor,
     _is_dy2st_enable_standalone_executor,
+    _is_enable_standalone_executor,
 )
-
-import unittest
+from paddle.fluid.framework import (
+    Variable,
+    _in_legacy_dygraph,
+    _test_eager_guard,
+)
+from paddle.fluid.layers.utils import _hash_with_id
 
 
 def _append_backward_desc(main_program, outs):
diff --git a/python/paddle/fluid/tests/unittests/test_eager_trace_op.py b/python/paddle/fluid/tests/unittests/test_eager_trace_op.py
index 6f93c4bd19dc16649edc1f0294c1a8d0dac26e99..b463cbb051a226fa97bd04ffa7a42e6a81aced41 100644
--- a/python/paddle/fluid/tests/unittests/test_eager_trace_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eager_trace_op.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_edit_distance_op.py b/python/paddle/fluid/tests/unittests/test_edit_distance_op.py
index c737ed2e41ca3582313aa0de3f9f2d563ed99097..38c304f579f5a0d5b8ac39d431877c2e1a4a1a93 100644
--- a/python/paddle/fluid/tests/unittests/test_edit_distance_op.py
+++ b/python/paddle/fluid/tests/unittests/test_edit_distance_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_egr_code_generate_api.py b/python/paddle/fluid/tests/unittests/test_egr_code_generate_api.py
index aea56537654da58ff393ad9f94d125179d8a70b5..20ce26acb9b7324b076a33a7fc3989cd8c70bfd7 100644
--- a/python/paddle/fluid/tests/unittests/test_egr_code_generate_api.py
+++ b/python/paddle/fluid/tests/unittests/test_egr_code_generate_api.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
+import unittest
+
 import numpy as np
+
+import paddle
 from paddle.fluid.framework import _test_eager_guard
-import unittest
 
 
 class EagerOpAPIGenerateTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_egr_python_api.py b/python/paddle/fluid/tests/unittests/test_egr_python_api.py
index 4471d78936ab822d00ecf030f96ea309833d8d48..25cdfe82af39b6e547c29f201ab68707c6bb83f5 100644
--- a/python/paddle/fluid/tests/unittests/test_egr_python_api.py
+++ b/python/paddle/fluid/tests/unittests/test_egr_python_api.py
@@ -12,9 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid.core as core
-import paddle
+import copy
+import unittest
+
 import numpy as np
+
+import paddle
+import paddle.fluid.core as core
 from paddle.fluid.framework import (
     EagerParamBase,
     _current_expected_place,
@@ -22,8 +26,6 @@ from paddle.fluid.framework import (
     _test_eager_guard,
     in_dygraph_mode,
 )
-import unittest
-import copy
 
 
 class EagerScaleTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_egr_string_tensor_api.py b/python/paddle/fluid/tests/unittests/test_egr_string_tensor_api.py
index b25e40149bac70c001dd452ba382747c9344481e..82ab0ee8ffbe9beff1968145f9a2a102d3322d77 100644
--- a/python/paddle/fluid/tests/unittests/test_egr_string_tensor_api.py
+++ b/python/paddle/fluid/tests/unittests/test_egr_string_tensor_api.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid.core as core
+import unittest
+
 import numpy as np
+
+import paddle.fluid.core as core
 from paddle.fluid.framework import _test_eager_guard
-import unittest
 
 
 class EagerStringTensorTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_eig_op.py b/python/paddle/fluid/tests/unittests/test_eig_op.py
index 338eb3512e57a3c3e64944959b79ce028d3dea3e..1696941b1ec5489d99e287f9546ff87c1975a0fe 100644
--- a/python/paddle/fluid/tests/unittests/test_eig_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eig_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+from op_test import OpTest, skip_check_grad_ci
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from op_test import OpTest, skip_check_grad_ci
-import unittest
 
 
 # cast output to complex for numpy.linalg.eig
diff --git a/python/paddle/fluid/tests/unittests/test_eigh_op.py b/python/paddle/fluid/tests/unittests/test_eigh_op.py
index 928234a138f13b38cb4f8a3ed5a13d02dcf9d2c9..33278050ef882c6cd821d7515a749ded7d5c06b4 100644
--- a/python/paddle/fluid/tests/unittests/test_eigh_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eigh_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
+
 
 def valid_eigh_result(A, eigh_value, eigh_vector, uplo):
     assert A.ndim == 2 or A.ndim == 3
diff --git a/python/paddle/fluid/tests/unittests/test_eigvals_op.py b/python/paddle/fluid/tests/unittests/test_eigvals_op.py
index df8d6b001cffbf5990a9d0cad92560037173ad2a..ac989f24755df118b73ac6e93aac149f73c3c95a 100644
--- a/python/paddle/fluid/tests/unittests/test_eigvals_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eigvals_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
-import paddle.fluid.core as core
+
 import numpy as np
 from op_test import OpTest
 
+import paddle
+import paddle.fluid.core as core
+
 np.set_printoptions(threshold=np.inf)
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_eigvalsh_op.py b/python/paddle/fluid/tests/unittests/test_eigvalsh_op.py
index 2dc378a0810dc5e24588b044d2bc3ee760849e61..d00431531cf6b27cdb410306b8a1649821b5b96f 100644
--- a/python/paddle/fluid/tests/unittests/test_eigvalsh_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eigvalsh_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
+
 
 def compare_result(actual, expected):
     assert actual.ndim == 1 or actual.ndim == 2
diff --git a/python/paddle/fluid/tests/unittests/test_einsum.py b/python/paddle/fluid/tests/unittests/test_einsum.py
index 2e8a0a6c7cb5e54046e1f447c9b49b731f5da286..a689c5f1e42fe7bd2748580e7751b415d1b5d896 100644
--- a/python/paddle/fluid/tests/unittests/test_einsum.py
+++ b/python/paddle/fluid/tests/unittests/test_einsum.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
+import os
 import unittest
+
+import numpy as np
+
 import paddle
 from paddle.fluid import core
 
-import os
-
 os.environ['FLAGS_new_einsum'] = "0"
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_einsum_op.py b/python/paddle/fluid/tests/unittests/test_einsum_op.py
index bb48cd31dd481f2820751f691993b86890d7562f..adb531b77868f6498c7f1622db497c4067351965 100644
--- a/python/paddle/fluid/tests/unittests/test_einsum_op.py
+++ b/python/paddle/fluid/tests/unittests/test_einsum_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
+
 
 class TestEinsumBinary(OpTest):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_einsum_v2.py b/python/paddle/fluid/tests/unittests/test_einsum_v2.py
index f45f9ace1cc6494586c9487018932436388cd790..1d76b4dea802d8f7e657475413e0d4a16cb1fac2 100644
--- a/python/paddle/fluid/tests/unittests/test_einsum_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_einsum_v2.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
+import os
 import unittest
+
+import numpy as np
+
 import paddle
 from paddle.fluid import core
 
-import os
-
 os.environ['FLAGS_new_einsum'] = "1"
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_add_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_add_op.py
index 79c5bdda4337b57c6b09d46e30ddb2e8567eebb6..3ddf25bcb09d786b73dda3d012e72da632115f43 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_add_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_add_op.py
@@ -13,17 +13,19 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 import paddle.fluid.core as core
+from paddle.fluid import Program, program_guard
+from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.tests.unittests.op_test import (
     OpTest,
-    skip_check_grad_ci,
     convert_float_to_uint16,
+    skip_check_grad_ci,
 )
-import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
-from paddle.fluid.framework import _test_eager_guard
 
 
 class TestElementwiseAddOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_div_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_div_op.py
index 9f37a456b7441e0f4be33b799907ba85c852e45b..3c01e3fd7b39a2e991cb09233efe0d4247df80c7 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_div_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_div_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci, convert_float_to_uint16
+from op_test import OpTest, convert_float_to_uint16, skip_check_grad_ci
+
 import paddle
 from paddle import fluid
 from paddle.fluid import core
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_floordiv_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_floordiv_op.py
index 022d5929f1bab440b08f79acaee5d60c442d3d07..0f2c68487be29577ea781285762c780a1afb8277 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_floordiv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_floordiv_op.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import random
 import unittest
+
 import numpy as np
-import paddle
-import paddle.fluid as fluid
 from op_test import OpTest
 
-import random
+import paddle
+import paddle.fluid as fluid
 
 
 class TestElementwiseModOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_gradient_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_gradient_op.py
index 91401ff574f6a2c7be1882cdc289b47f4a7358c3..fff002d40d2ca8fb34cc542409cdfb160921d83c 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_gradient_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_gradient_op.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 class TestElementWiseAddOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_heaviside_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_heaviside_op.py
index aebf1c3f4fe82e95a0d2a8d86f3cd56f2c64b823..d917a6bc33a661c0e448b1a25c22f3a7d3f52935 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_heaviside_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_heaviside_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_max_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_max_op.py
index 671b5a942b8a8477fa1fd4832994e81377b66271..f6d1774068738277651a58fb124524a2de88dede 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_max_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_max_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci, convert_float_to_uint16
-import paddle.fluid.core as core
+from op_test import OpTest, convert_float_to_uint16, skip_check_grad_ci
+
 import paddle
+import paddle.fluid.core as core
 
 
 class TestElementwiseOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_min_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_min_op.py
index 8df9f9842b88547a727da000ff17fc26f238735d..c9835b5cb1566f671154a191f34ac9912bc20b50 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_min_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_min_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, skip_check_grad_ci
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_mod_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_mod_op.py
index 9c9d2d91209f35d25da147119b10961ac8d5a398..d953fbbad85d976646d4e46e318369b427269b4d 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_mod_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_mod_op.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import random
 import unittest
+
 import numpy as np
-import paddle
-import paddle.fluid as fluid
 from op_test import OpTest
 
-import random
+import paddle
+import paddle.fluid as fluid
 
 
 class TestElementwiseModOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_mul_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_mul_op.py
index c72728cfe951b3d5c9539068b110865950207f11..0d3b829e9159d0bd8a9512097fdb9b9e96f65bdb 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_mul_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_mul_op.py
@@ -15,16 +15,16 @@
 import unittest
 
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
-
 from paddle.fluid.tests.unittests.op_test import (
     OpTest,
-    skip_check_grad_ci,
     convert_float_to_uint16,
+    skip_check_grad_ci,
 )
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_nn_grad.py b/python/paddle/fluid/tests/unittests/test_elementwise_nn_grad.py
index 3f816b616501348f49abee214cfa5550e070f46a..115d5e947f6a730471153c59b0af127dab282bab 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_nn_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_nn_grad.py
@@ -13,15 +13,15 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
-import gradient_checker
-
-from decorator_helper import prog_scope
+import paddle.fluid.layers as layers
 
 
 class TestElementwiseMulDoubleGradCheck(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_pow_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_pow_op.py
index 1d53dbdb2fa6a505946e70c9bcba9eb74971c7e5..6ff9c7961cd78bd81ace54bb0e94e20e3a26ae41 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_pow_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_pow_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, skip_check_grad_ci
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 
 
 def pow_grad(x, y, dout):
diff --git a/python/paddle/fluid/tests/unittests/test_elementwise_sub_op.py b/python/paddle/fluid/tests/unittests/test_elementwise_sub_op.py
index d2ad1d90f0846c4fd94249357510920536cc7cb2..99880d1e2aad7d6100536bd83f43269ae971c04b 100644
--- a/python/paddle/fluid/tests/unittests/test_elementwise_sub_op.py
+++ b/python/paddle/fluid/tests/unittests/test_elementwise_sub_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest, convert_float_to_uint16, skip_check_grad_ci
+
 import paddle
 import paddle.fluid as fluid
-from op_test import OpTest, skip_check_grad_ci, convert_float_to_uint16
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_ema.py b/python/paddle/fluid/tests/unittests/test_ema.py
index fe4178c825980573d2be6dff933401b54d980613..811e49cc9027976126936763c8a82bf7e571813d 100644
--- a/python/paddle/fluid/tests/unittests/test_ema.py
+++ b/python/paddle/fluid/tests/unittests/test_ema.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_ema_fleet.py b/python/paddle/fluid/tests/unittests/test_ema_fleet.py
index 8a3a6993d050d648b45f18617071811bd2c947bd..7bc95afeae3fbd5e67de0f3eaae030186abc137c 100644
--- a/python/paddle/fluid/tests/unittests/test_ema_fleet.py
+++ b/python/paddle/fluid/tests/unittests/test_ema_fleet.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
-import paddle.utils as utils
 import paddle.static as static
+import paddle.utils as utils
 
 
 def gen_data():
diff --git a/python/paddle/fluid/tests/unittests/test_embedding_id_stop_gradient.py b/python/paddle/fluid/tests/unittests/test_embedding_id_stop_gradient.py
index be5fdcba6955757697a72eac1bde1f1980965076..a61b396273fba4ea370079a7f3a3ea5804ac1522 100644
--- a/python/paddle/fluid/tests/unittests/test_embedding_id_stop_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_embedding_id_stop_gradient.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import unittest
 
 
 class TestEmbeddingIdStopGradientBase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_empty_like_op.py b/python/paddle/fluid/tests/unittests/test_empty_like_op.py
index 82ad72e11e5f2b2bf7ee8a8aa0316823a5703c31..96665f11130f41ce80b12bff875c98f1ac9aab0c 100644
--- a/python/paddle/fluid/tests/unittests/test_empty_like_op.py
+++ b/python/paddle/fluid/tests/unittests/test_empty_like_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
-from paddle.fluid.data_feeder import convert_dtype
 import paddle.fluid.core as core
-from paddle.static import program_guard, Program
+from paddle.fluid.data_feeder import convert_dtype
+from paddle.static import Program, program_guard
 
 
 class TestEmptyLikeAPICommon(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_empty_op.py b/python/paddle/fluid/tests/unittests/test_empty_op.py
index 7b488aa0c6dda17a9e00fd152cd178b4562c982b..718835f1a8494adbff69a9b52a1b62d59793ad72 100644
--- a/python/paddle/fluid/tests/unittests/test_empty_op.py
+++ b/python/paddle/fluid/tests/unittests/test_empty_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
-from op_test import OpTest
 from paddle.fluid.framework import convert_np_dtype_to_dtype_
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_entry_attr.py b/python/paddle/fluid/tests/unittests/test_entry_attr.py
index cfbff2113c3046c24a61989d123399efb035d55c..1ae98ab7cd6f251f345eddb1f8ac7c1f156e0f17 100644
--- a/python/paddle/fluid/tests/unittests/test_entry_attr.py
+++ b/python/paddle/fluid/tests/unittests/test_entry_attr.py
@@ -17,10 +17,11 @@ import paddle
 paddle.enable_static()
 
 import unittest
+
 import paddle.fluid as fluid
 from paddle.distributed import (
-    ProbabilityEntry,
     CountFilterEntry,
+    ProbabilityEntry,
     ShowClickEntry,
 )
 
diff --git a/python/paddle/fluid/tests/unittests/test_entry_attr2.py b/python/paddle/fluid/tests/unittests/test_entry_attr2.py
index f4f098798ac01dd69c00cf671871cffa73535ed5..d1f546249b0f327cd9380345f81f9c04392cad83 100644
--- a/python/paddle/fluid/tests/unittests/test_entry_attr2.py
+++ b/python/paddle/fluid/tests/unittests/test_entry_attr2.py
@@ -17,6 +17,7 @@ import paddle
 paddle.enable_static()
 
 import unittest
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_erf_op.py b/python/paddle/fluid/tests/unittests/test_erf_op.py
index f21ae86d1c2eac3fdfb25fc141754f12ac1bc6c6..06b7f55069fb94d08dbdb5a5d551d23cff7d06ea 100644
--- a/python/paddle/fluid/tests/unittests/test_erf_op.py
+++ b/python/paddle/fluid/tests/unittests/test_erf_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from scipy.special import erf
 from op_test import OpTest
+from scipy.special import erf
 
 import paddle
 import paddle.fluid as fluid
diff --git a/python/paddle/fluid/tests/unittests/test_erfinv_op.py b/python/paddle/fluid/tests/unittests/test_erfinv_op.py
index e605d8e0e62a4d00a965da6515c0c82592aebbea..a4265b17895a60d23c6b4f5a822f53b0e242aed9 100644
--- a/python/paddle/fluid/tests/unittests/test_erfinv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_erfinv_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from scipy.special import erfinv
 from op_test import OpTest
+from scipy.special import erfinv
+
 import paddle
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_exception.py b/python/paddle/fluid/tests/unittests/test_exception.py
index bb53ae950287eb109af1575ee7a09c6cff56e913..a42c2f5bad0f0a13405914957c5c7ef36cf2d2f7 100644
--- a/python/paddle/fluid/tests/unittests/test_exception.py
+++ b/python/paddle/fluid/tests/unittests/test_exception.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy
 import unittest
 
+import numpy
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_executor_and_mul.py b/python/paddle/fluid/tests/unittests/test_executor_and_mul.py
index f85f7b97ec8578ea8ad450f07192decb71d4342f..639f84295b24b75cedc8884324de50860ee35996 100644
--- a/python/paddle/fluid/tests/unittests/test_executor_and_mul.py
+++ b/python/paddle/fluid/tests/unittests/test_executor_and_mul.py
@@ -15,8 +15,9 @@
 import unittest
 
 import numpy as np
+
 from paddle.fluid.executor import Executor
-from paddle.fluid.layers import mul, data, zeros, array_write, increment
+from paddle.fluid.layers import array_write, data, increment, mul, zeros
 
 
 class TestExecutor(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_executor_and_use_program_cache.py b/python/paddle/fluid/tests/unittests/test_executor_and_use_program_cache.py
index 2412794929c055786cd161d7ebd9062721bc9d7a..a6b097e1f7ac711c9739d63763e3062a113f6a4f 100644
--- a/python/paddle/fluid/tests/unittests/test_executor_and_use_program_cache.py
+++ b/python/paddle/fluid/tests/unittests/test_executor_and_use_program_cache.py
@@ -15,9 +15,10 @@
 import unittest
 
 import numpy as np
-import paddle.fluid.core as core
+from test_eager_deletion_padding_rnn import PaddingRNNTestBase, RNNConfig
+
 import paddle.fluid as fluid
-from test_eager_deletion_padding_rnn import RNNConfig, PaddingRNNTestBase
+import paddle.fluid.core as core
 
 
 class TestExecutor(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_executor_check_fetch_list.py b/python/paddle/fluid/tests/unittests/test_executor_check_fetch_list.py
index d6711a612d6930a37b7fe6d5323b72cff5044b79..4756e5d861df1705f926ea3756abcae1bd3feda2 100644
--- a/python/paddle/fluid/tests/unittests/test_executor_check_fetch_list.py
+++ b/python/paddle/fluid/tests/unittests/test_executor_check_fetch_list.py
@@ -15,8 +15,8 @@
 import unittest
 
 import numpy as np
+
 import paddle
-import unittest
 
 
 class TestCheckFetchList(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_executor_feed_non_tensor.py b/python/paddle/fluid/tests/unittests/test_executor_feed_non_tensor.py
index 41b4211a8bcc69019b3952d407c429837e88855a..e2c52d99fd2d80aa4e43963ed0b070ba0aebfc9f 100644
--- a/python/paddle/fluid/tests/unittests/test_executor_feed_non_tensor.py
+++ b/python/paddle/fluid/tests/unittests/test_executor_feed_non_tensor.py
@@ -15,6 +15,7 @@
 import unittest
 
 import numpy
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_executor_return_tensor_not_overwriting.py b/python/paddle/fluid/tests/unittests/test_executor_return_tensor_not_overwriting.py
index 7a3063025d5dc24d13921e7a24487ed4ec75e307..c9ddac80f0eb6a69a9028283ca56877be65e1496 100644
--- a/python/paddle/fluid/tests/unittests/test_executor_return_tensor_not_overwriting.py
+++ b/python/paddle/fluid/tests/unittests/test_executor_return_tensor_not_overwriting.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
 from op_test import OpTest, skip_check_grad_ci
 
+import paddle.fluid as fluid
+
 
 @skip_check_grad_ci(reason="Not op test but call the method of class OpTest.")
 class TestExecutorReturnTensorNotOverwritingWithOptest(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_expand_as_op.py b/python/paddle/fluid/tests/unittests/test_expand_as_op.py
index 868f0d269ee44146b66c4946082887179e463e0a..b5b8013a2c9c6391d5022eb8c09e32dfcfb6891c 100755
--- a/python/paddle/fluid/tests/unittests/test_expand_as_op.py
+++ b/python/paddle/fluid/tests/unittests/test_expand_as_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_expand_as_v2_op.py b/python/paddle/fluid/tests/unittests/test_expand_as_v2_op.py
index 5f4c04470ff937d0dc0d0f22e931cb08c0f57480..fccfab3e4c3fd3c644efc8c82fa616fc100673a8 100755
--- a/python/paddle/fluid/tests/unittests/test_expand_as_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_expand_as_v2_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_expand_op.py b/python/paddle/fluid/tests/unittests/test_expand_op.py
index 9fb4c7c804e0178dff50341a8513264aacd1141d..71ba5483c0e4df0b93d56fe787d1951786498ffd 100644
--- a/python/paddle/fluid/tests/unittests/test_expand_op.py
+++ b/python/paddle/fluid/tests/unittests/test_expand_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_expand_v2_op.py b/python/paddle/fluid/tests/unittests/test_expand_v2_op.py
index da27fb397cc595e4046170e22dfc3eeff6a7e22f..289f27d9c474d7bab4f9acea05cf66607fffff68 100644
--- a/python/paddle/fluid/tests/unittests/test_expand_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_expand_v2_op.py
@@ -13,15 +13,17 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
 from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.layers as layers
 from paddle.fluid import Program, core, program_guard
-import paddle
 from paddle.fluid.framework import _test_eager_guard
-import gradient_checker
-from decorator_helper import prog_scope
-import paddle.fluid.layers as layers
 
 
 # Situation 1: shape is a list(without tensor)
diff --git a/python/paddle/fluid/tests/unittests/test_exponential_op.py b/python/paddle/fluid/tests/unittests/test_exponential_op.py
index 458be9f3635b2fa941873f7825ec3680771a5f62..cc0144a56a1a7212f248ab058bf8db6ab23e0519 100644
--- a/python/paddle/fluid/tests/unittests/test_exponential_op.py
+++ b/python/paddle/fluid/tests/unittests/test_exponential_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
 from op_test import OpTest
 
+import paddle
+
 paddle.seed(100)
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_eye_op.py b/python/paddle/fluid/tests/unittests/test_eye_op.py
index fb93aee9b30cd9d59a297b5a73b002c65a1b4e31..172fef4d89780a4705c480baff8b4bdb58d8828b 100644
--- a/python/paddle/fluid/tests/unittests/test_eye_op.py
+++ b/python/paddle/fluid/tests/unittests/test_eye_op.py
@@ -14,15 +14,15 @@
 
 import os
 import unittest
+
 import numpy as np
 from op_test import OpTest
+from test_attribute_var import UnittestBase
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.framework as framework
-
-from paddle.fluid.framework import program_guard, Program
-from test_attribute_var import UnittestBase
+from paddle.fluid.framework import Program, program_guard
 
 
 class TestEyeOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_fake_dequantize_op.py b/python/paddle/fluid/tests/unittests/test_fake_dequantize_op.py
index b56ff6edbfe9754784652b269c4cd1ecb78a924b..47ab4754f2a3f07f82158a542e11fc5d1e296415 100644
--- a/python/paddle/fluid/tests/unittests/test_fake_dequantize_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fake_dequantize_op.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
-import math
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fake_quantize_op.py b/python/paddle/fluid/tests/unittests/test_fake_quantize_op.py
index 5bcb0eec733f5f12e96ca4a5f128a126dc6a7a5a..95df904b235f104c25e3a7095bbf2cfe0d7c0385 100644
--- a/python/paddle/fluid/tests/unittests/test_fake_quantize_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fake_quantize_op.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import itertools
-import numpy as np
 import math
+import unittest
+
+import numpy as np
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_faster_tokenizer_op.py b/python/paddle/fluid/tests/unittests/test_faster_tokenizer_op.py
index c231bffc9d300fa0e3607765d3a854dd13761688..6f3c23280080464e08d3d73e5243d77dfa1cc931 100755
--- a/python/paddle/fluid/tests/unittests/test_faster_tokenizer_op.py
+++ b/python/paddle/fluid/tests/unittests/test_faster_tokenizer_op.py
@@ -13,17 +13,17 @@
 # limitations under the License.
 
 import os
+import sys
+import tempfile
 import unittest
 
 import numpy as np
+
 import paddle
 import paddle.nn as nn
-from paddle.fluid.framework import core, _non_static_mode, _test_eager_guard
-from paddle.fluid.layer_helper import LayerHelper
 from paddle import _legacy_C_ops
-
-import sys
-import tempfile
+from paddle.fluid.framework import _non_static_mode, _test_eager_guard, core
+from paddle.fluid.layer_helper import LayerHelper
 
 sys.path.append("./tokenizer")
 from tokenizer.bert_tokenizer import BertTokenizer
diff --git a/python/paddle/fluid/tests/unittests/test_fc_op.py b/python/paddle/fluid/tests/unittests/test_fc_op.py
index 8003c0f99e84ba072dfc94a54b942a23f4975cc4..bc339a516ffacdaa15e89a473ff7227745bb09d8 100644
--- a/python/paddle/fluid/tests/unittests/test_fc_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fc_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard, core
+from paddle.fluid import Program, core, program_guard
 
 SEED = 2020
 
diff --git a/python/paddle/fluid/tests/unittests/test_feed_data_check_shape_type.py b/python/paddle/fluid/tests/unittests/test_feed_data_check_shape_type.py
index 764e5e75067480df86d2c408903b2031ac0667d8..f1a1fb5f3b513078feec53717d6374043f15e3de 100644
--- a/python/paddle/fluid/tests/unittests/test_feed_data_check_shape_type.py
+++ b/python/paddle/fluid/tests/unittests/test_feed_data_check_shape_type.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import multiprocessing
-import numpy as np
 import os
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.compiler as compiler
 import paddle.fluid.core as core
-import unittest
 
 os.environ['CPU_NUM'] = str(4)
 np.random.seed(123)
diff --git a/python/paddle/fluid/tests/unittests/test_feed_fetch_method.py b/python/paddle/fluid/tests/unittests/test_feed_fetch_method.py
index 4054af8fb5192532ed256815ed6310b4cd132e38..aa7d2ea4b020a618b11b656309075e56a1e56920 100644
--- a/python/paddle/fluid/tests/unittests/test_feed_fetch_method.py
+++ b/python/paddle/fluid/tests/unittests/test_feed_fetch_method.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid.core as core
 import unittest
+
 import numpy as np
 
+import paddle.fluid.core as core
+
 
 class TestFeedFetch(unittest.TestCase):
     def test_feed_fetch(self):
diff --git a/python/paddle/fluid/tests/unittests/test_fetch_handler.py b/python/paddle/fluid/tests/unittests/test_fetch_handler.py
index 6a8b1f689fd7975d84536c903858df88f62c12d0..deb2d051ff1f662e72293192c8a9c3f17e8461f5 100644
--- a/python/paddle/fluid/tests/unittests/test_fetch_handler.py
+++ b/python/paddle/fluid/tests/unittests/test_fetch_handler.py
@@ -14,11 +14,12 @@
 
 import time
 import unittest
+
 import numpy as np
-from paddle.fluid.framework import Program
 
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+from paddle.fluid.framework import Program
 
 
 class TestFetchHandler(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fetch_lod_tensor_array.py b/python/paddle/fluid/tests/unittests/test_fetch_lod_tensor_array.py
index c096a4c8a6e02789f441ee576765b5af6e449655..b2869d88882375c4c81748663ddb851cd5074195 100644
--- a/python/paddle/fluid/tests/unittests/test_fetch_lod_tensor_array.py
+++ b/python/paddle/fluid/tests/unittests/test_fetch_lod_tensor_array.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import os
-import numpy as np
 import unittest
+
+import numpy as np
+from simple_nets import simple_fc_net, simple_fc_net_with_inputs
+
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-from simple_nets import simple_fc_net_with_inputs, simple_fc_net
 
 
 class TestFetchLoDTensorArray(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fetch_unmerged.py b/python/paddle/fluid/tests/unittests/test_fetch_unmerged.py
index 0da628db92c1123170e606f29abee330d6a8e66e..978298f8f859d9327550c5749aad8f3111ea9865 100644
--- a/python/paddle/fluid/tests/unittests/test_fetch_unmerged.py
+++ b/python/paddle/fluid/tests/unittests/test_fetch_unmerged.py
@@ -14,9 +14,11 @@
 
 import os
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 
 os.environ["CPU_NUM"] = "2"
 
diff --git a/python/paddle/fluid/tests/unittests/test_fetch_var.py b/python/paddle/fluid/tests/unittests/test_fetch_var.py
index 98b06b31368d976ccf6edbf6acd66af62248ad9e..4339813584a909d628a3c83725b96fa14c50f407 100644
--- a/python/paddle/fluid/tests/unittests/test_fetch_var.py
+++ b/python/paddle/fluid/tests/unittests/test_fetch_var.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import numpy as np
+
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import numpy as np
-import unittest
 
 
 class TestFetchVar(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fill_any_like_op.py b/python/paddle/fluid/tests/unittests/test_fill_any_like_op.py
index 1739361080d3b731568a5073ae73b298d23f8c8b..9fa333d623bf918df50c6f742ed23c425953f8c9 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_any_like_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_any_like_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid.core as core
 import unittest
+
 import numpy as np
 from op_test import OpTest, convert_float_to_uint16
 
+import paddle
+import paddle.fluid.core as core
+
 
 class TestFillAnyLikeOp(OpTest):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_fill_any_op.py b/python/paddle/fluid/tests/unittests/test_fill_any_op.py
index 76daed5a5d84a2562c76cad6b25e942b192cfc69..36d6d5a1566b541c5830d858e1e3dee08d63d389 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_any_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_any_op.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
+import paddle
+
 
 class TestFillAnyOp(OpTest):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_fill_constant_batch_size_like.py b/python/paddle/fluid/tests/unittests/test_fill_constant_batch_size_like.py
index 339fafbd0b4e2d168df5c0905ddef61d4b75092c..d6114ec8dc6dd124c7dcad3ee087b8f489a43a6f 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_constant_batch_size_like.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_constant_batch_size_like.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
 from paddle.fluid.framework import convert_np_dtype_to_dtype_
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_fill_constant_op.py b/python/paddle/fluid/tests/unittests/test_fill_constant_op.py
index 838efff490ab813a2cdfb9bae644dc11628db98b..5e1af99259db1acd868da01614399f286101db3f 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_constant_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_constant_op.py
@@ -13,15 +13,15 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, convert_float_to_uint16
 
 import paddle
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
-import numpy as np
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
+from paddle.fluid.op import Operator
 
 
 # Situation 1: Attr(shape) is a list(without tensor)
diff --git a/python/paddle/fluid/tests/unittests/test_fill_diagonal_tensor_op.py b/python/paddle/fluid/tests/unittests/test_fill_diagonal_tensor_op.py
index f412a161eb63c04a1b4c7bd6d57918ab426ed3c7..4550ccc4a1826ff8729f0c4a5a43d7589e55c58f 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_diagonal_tensor_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_diagonal_tensor_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
+
 
 def fill_diagonal_ndarray(x, value, offset=0, dim1=0, dim2=1):
     """Fill value into the diagonal of x that offset is ${offset} and the coordinate system is (dim1, dim2)."""
diff --git a/python/paddle/fluid/tests/unittests/test_fill_op.py b/python/paddle/fluid/tests/unittests/test_fill_op.py
index 95a432136caca74325d9dc6322da754bd7476b56..499377146676a2ab7732a11972e002f757822272 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid.core as core
 from paddle.fluid.op import Operator
 
diff --git a/python/paddle/fluid/tests/unittests/test_fill_zeros_like2_op.py b/python/paddle/fluid/tests/unittests/test_fill_zeros_like2_op.py
index f1a1039ea016cc75fe0cffb1ee128c1999520b9f..2cb8646019093630b6dc0201903eb212844b30b3 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_zeros_like2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_zeros_like2_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle.fluid as fluid
 from paddle.fluid.framework import convert_np_dtype_to_dtype_
-from op_test import OpTest
 
 
 class TestFillZerosLike2Op(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_fill_zeros_like_op.py b/python/paddle/fluid/tests/unittests/test_fill_zeros_like_op.py
index 7317973e774ab5b9d9d99cad6f2da0334c871105..805d9c88d6cb23cfa6c6de3067c00b82539b1358 100644
--- a/python/paddle/fluid/tests/unittests/test_fill_zeros_like_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fill_zeros_like_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_filter_by_instag_op.py b/python/paddle/fluid/tests/unittests/test_filter_by_instag_op.py
index e1136d677a13d932e8ee4d9acf756feb70c1c4c8..153d22bfce15fee744ccc8557966295abba84808 100644
--- a/python/paddle/fluid/tests/unittests/test_filter_by_instag_op.py
+++ b/python/paddle/fluid/tests/unittests/test_filter_by_instag_op.py
@@ -14,6 +14,7 @@
 """This is unit test of Test filter_instag Op."""
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_flatten2_op.py b/python/paddle/fluid/tests/unittests/test_flatten2_op.py
index d67b873084d5a02b8237dc22a641639a3dd7776d..115699025d83f8f50e928bc35a2278f5f05a3312 100644
--- a/python/paddle/fluid/tests/unittests/test_flatten2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_flatten2_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_flatten_contiguous_range_op.py b/python/paddle/fluid/tests/unittests/test_flatten_contiguous_range_op.py
index 8d1bcc6254d01094308a30e7173b993dbf2d4985..06cef1d48cef05a4688f08c77145e814a5f397b2 100644
--- a/python/paddle/fluid/tests/unittests/test_flatten_contiguous_range_op.py
+++ b/python/paddle/fluid/tests/unittests/test_flatten_contiguous_range_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 
+import paddle
+
 
 class TestFlattenOp(OpTest):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_flatten_op.py b/python/paddle/fluid/tests/unittests/test_flatten_op.py
index a1108d3392ca58756adcff9243fa1dd44454bdc4..7753f2d90ee66e150eb120a2f62f185d4bb24d2e 100644
--- a/python/paddle/fluid/tests/unittests/test_flatten_op.py
+++ b/python/paddle/fluid/tests/unittests/test_flatten_op.py
@@ -13,8 +13,8 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 
+import numpy as np
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet.py b/python/paddle/fluid/tests/unittests/test_fleet.py
index 75d6ab317548316b0368f93eb380372f3a979312..d0445c2c5e09b864e7520dffa1090d22b48e52c9 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet.py
@@ -34,8 +34,8 @@ class TestFleet1(unittest.TestCase):
         """Test cases for pslib."""
         import paddle
         import paddle.fluid as fluid
-        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
         from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
 
         os.environ["POD_IP"] = "127.0.0.1"
         os.environ["PADDLE_PORT"] = "36001"
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_api_input.py b/python/paddle/fluid/tests/unittests/test_fleet_api_input.py
index ac77fc42efdfbf753629995a811d5260b949c71e..b3817573352f15d83a5eb0d20970c0facef7adaf 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_api_input.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_api_input.py
@@ -13,23 +13,25 @@
 # limitations under the License.
 
 import unittest
+
+from dist_simnet_bow import train_network
+
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid.transpiler.distribute_transpiler import (
-    DistributeTranspilerConfig,
-)
-from paddle.fluid.incubate.fleet.base.role_maker import UserDefinedRoleMaker
+import paddle.fluid.incubate.fleet.base.role_maker as role_maker
 from paddle.fluid.incubate.fleet.base.role_maker import (
+    Role,
     UserDefinedCollectiveRoleMaker,
+    UserDefinedRoleMaker,
 )
-from paddle.fluid.incubate.fleet.base.role_maker import Role
-import paddle.fluid.incubate.fleet.base.role_maker as role_maker
+from paddle.fluid.incubate.fleet.collective import CollectiveOptimizer
+from paddle.fluid.incubate.fleet.parameter_server import TranspilerOptimizer
 from paddle.fluid.incubate.fleet.parameter_server.distribute_transpiler import (
     fleet,
 )
-from paddle.fluid.incubate.fleet.parameter_server import TranspilerOptimizer
-from paddle.fluid.incubate.fleet.collective import CollectiveOptimizer
-from dist_simnet_bow import train_network
+from paddle.fluid.transpiler.distribute_transpiler import (
+    DistributeTranspilerConfig,
+)
 
 
 class DistributeTranspilerConfigTest(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_auto.py b/python/paddle/fluid/tests/unittests/test_fleet_auto.py
index 608b948d35f06aa3e532438b39a65fdc13ae4b6d..22abaaf4d18c3662468933246e505feb5fb770e1 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_auto.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_auto.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import paddle
-import os
 import paddle.distributed.fleet as fleet
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_base.py b/python/paddle/fluid/tests/unittests/test_fleet_base.py
index 686c7fa1ef75a260f78bde89cee8aa637825d911..74886d9a9c12307716e741fa55c264879eb9cc79 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_base.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_base.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
-import os
 import paddle.fluid as fluid
-import numpy as np
 
 
 class TestFleetBase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_base_2.py b/python/paddle/fluid/tests/unittests/test_fleet_base_2.py
index 084718c5407a338aa05d4c6bc47b0a433e8f19fb..64cd2df9037290c9ee2dce09ebcb4bfa4ea81039 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_base_2.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_base_2.py
@@ -14,11 +14,13 @@
 
 import tempfile
 import unittest
+
 import paddle
 
 paddle.enable_static()
 
 import os
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_base_3.py b/python/paddle/fluid/tests/unittests/test_fleet_base_3.py
index d9014b2c6f858a5b747c94e0e9e9de26df033d77..7d1672064d1156661fe3ecb841009ef88416baef 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_base_3.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_base_3.py
@@ -12,8 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import os
+import unittest
+
 import paddle
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_base_4.py b/python/paddle/fluid/tests/unittests/test_fleet_base_4.py
index 986a48162b28c3f52b9f763ca76538315e8343af..ac0bbea11fde5d35931ef88f1bf51c3af7003117 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_base_4.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_base_4.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import paddle
-import os
 import paddle.distributed.fleet as fleet
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_base_single.py b/python/paddle/fluid/tests/unittests/test_fleet_base_single.py
index 6b574b84b92d24460d02a656ccef96b1a71513ab..39825686b371130b5a438d2442ffee11342864ed 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_base_single.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_base_single.py
@@ -12,18 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import os
 
+import numpy as np
+
 cuda_visible_devices = os.getenv('CUDA_VISIBLE_DEVICES')
 if cuda_visible_devices is None or cuda_visible_devices == "":
     os.environ['CUDA_VISIBLE_DEVICES'] = '0'
 else:
     os.environ['CUDA_VISIBLE_DEVICES'] = cuda_visible_devices.split(',')[0]
+import unittest
+
 import paddle
 import paddle.distributed.fleet as fleet
 import paddle.fluid as fluid
-import unittest
 import paddle.nn as nn
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_elastic_collective.py b/python/paddle/fluid/tests/unittests/test_fleet_elastic_collective.py
index 2d9a9268ee3fa17ca68fe2080472bb6961795c93..31f45aa09af0f8e3e4c4c4cdd4f6a9934929df06 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_elastic_collective.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_elastic_collective.py
@@ -13,8 +13,8 @@
 # limitations under the License.
 
 import os
-import unittest
 import tempfile
+import unittest
 
 from paddle.distributed.fleet.elastic.collective import CollectiveLauncher
 from paddle.distributed.fleet.launch import launch_collective
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_elastic_manager.py b/python/paddle/fluid/tests/unittests/test_fleet_elastic_manager.py
index 0570ae1928c12440d6dad33b84b4fd62ab09f458..7c42a59000ee444bb64bda109b3e7bf4b64de632 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_elastic_manager.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_elastic_manager.py
@@ -15,10 +15,10 @@
 import os
 import unittest
 
-from paddle.distributed.fleet.elastic.manager import ElasticManager
-from paddle.distributed.fleet.elastic.manager import LauncherInterface
 from paddle.distributed.fleet.elastic.manager import (
     ELASTIC_AUTO_PARALLEL_EXIT_CODE,
+    ElasticManager,
+    LauncherInterface,
 )
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_run.py b/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_run.py
index 4e37988f7673eee94776f3eea9edbd1d3c9600f1..ebc790c4034630e2d50816d3994b641fc53a60cf 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_run.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_run.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import paddle
-import numpy as np
 import os
 import tempfile
+import unittest
+
+import numpy as np
+
+import paddle
 from paddle.fluid import core
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_tensor.py b/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_tensor.py
index 85da732ab5bd6d7238c32ba146ef5fccefd138e1..b5c4af9fc763f96adae1eb958eb3373aa1e04d98 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_tensor.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_exe_dist_model_tensor.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
-from paddle.fluid.core import DistModelTensor
-from paddle.fluid.core import DistModelDataType
+
+import paddle
+from paddle.fluid.core import DistModelDataType, DistModelTensor
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_executor.py b/python/paddle/fluid/tests/unittests/test_fleet_executor.py
index 502f03784cbcc368a2b635c69fe10d7e0d3ee887..e81fc34ea2ca0fb8eea864a51791bf7b13a5abc0 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_executor.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_executor.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_executor_multi_devices.py b/python/paddle/fluid/tests/unittests/test_fleet_executor_multi_devices.py
index 5c635e4ce480761d7cd790ff81459bc0c9b23956..b2a1c488dcec66016c00d3d7e8b1de9b22b91d57 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_executor_multi_devices.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_executor_multi_devices.py
@@ -12,11 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import os
+import unittest
+
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed.fleet as fleet
+import paddle.fluid as fluid
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_executor_origin_scheduler.py b/python/paddle/fluid/tests/unittests/test_fleet_executor_origin_scheduler.py
index cda6be8f0a6be003554e69799651d1a9f9e254c9..0de28e9839efa344244eeba0e60ad93afdca0291 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_executor_origin_scheduler.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_executor_origin_scheduler.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_executor_task_node.py b/python/paddle/fluid/tests/unittests/test_fleet_executor_task_node.py
index 03d6be10111f3d1ffc0702fd63d669bc20785c67..6d74fdc075cdf0f3a0282dd74c7a024028b2d1bc 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_executor_task_node.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_executor_task_node.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 import paddle.fluid.core as core
 from paddle.distributed.fleet.fleet_executor_utils import TaskNode
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_executor_utils.py b/python/paddle/fluid/tests/unittests/test_fleet_executor_utils.py
index fb003f450f6e18aa07c1b0c49f18fc68e73d11b6..63befae625379a2cbbfefa07faee0f34a8b3fc2b 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_executor_utils.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_executor_utils.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 from paddle.distributed.fleet.fleet_executor_utils import FleetExecutorUtils
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_executor_with_task_nodes.py b/python/paddle/fluid/tests/unittests/test_fleet_executor_with_task_nodes.py
index 802ce0cbfe3c975bd2a96929d1d18670ae6dfdc7..36a85e2d74fc7af46061dc3ccef0e1255cdaa056 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_executor_with_task_nodes.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_executor_with_task_nodes.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 from paddle.distributed.fleet.fleet_executor_utils import TaskNode
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_gradient_scale.py b/python/paddle/fluid/tests/unittests/test_fleet_gradient_scale.py
index 36e823a2bc92a39509d160852c6eb01ae45efe6c..bda452e088997240e2bc06fe5e97e0185cf5dab4 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_gradient_scale.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_gradient_scale.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
 
+import numpy as np
+
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed.fleet as fleet
-import numpy as np
-import os
+import paddle.fluid as fluid
 
 
 class TestGradientScale(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_metric.py b/python/paddle/fluid/tests/unittests/test_fleet_metric.py
index 76aff57125b96794ec49d0904129702ebc04b171..d5435d3941f6f36b58bd29630f7a9c61063b05f4 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_metric.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_metric.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 """Test fleet metric."""
 
-import numpy as np
-import paddle
-import paddle.fluid as fluid
 import unittest
+
 import numpy as np
-import paddle.distributed.fleet.metrics.metric as metric
+
+import paddle
 import paddle.distributed.fleet as fleet
+import paddle.distributed.fleet.metrics.metric as metric
+import paddle.fluid as fluid
 from paddle.distributed.fleet.base.util_factory import UtilBase
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py b/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py
index 8c92efe323650e7e3dad494042d121367c1db53e..577652037e53862fdbe74081c3b16f2f3ae66242 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py
@@ -32,8 +32,8 @@ class TestFleet1(unittest.TestCase):
     def test_pslib_1(self):
         """Test cases for pslib."""
         import paddle.fluid as fluid
-        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
         from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
 
         os.environ["POD_IP"] = "127.0.0.1"
         os.environ["PADDLE_PORT"] = "36001"
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_ps.py b/python/paddle/fluid/tests/unittests/test_fleet_ps.py
index f5f7f81311cfc2db9d851385271e5cf37cd7ea9e..1d4c319d5c85a240bb666daf12d82fb83a0bf14e 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_ps.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_ps.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from paddle.fluid.framework import default_main_program
 from paddle.fluid.incubate.fleet.parameter_server.ir.pserver_pass import (
     _get_optimizer_input_shape,
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_pyramid_hash.py b/python/paddle/fluid/tests/unittests/test_fleet_pyramid_hash.py
index c558bc0f0abad9f5ad52c60dae17fc6a172576a4..10a7a7037e2f6d643c2c6a7c0c8cf47862fe0a1d 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_pyramid_hash.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_pyramid_hash.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.incubate.fleet.base.role_maker as role_maker
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker.py
index 05732d3cc86199a1ffec7b110b6d1a0a1bda7e3a..f64d8cb1692b2034a015e21923b777ef5ad09ddc 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker.py
@@ -15,6 +15,7 @@
 
 import os
 import unittest
+
 import paddle.fluid.incubate.fleet.base.role_maker as role_maker
 
 
@@ -61,8 +62,8 @@ class TestCloudRoleMaker(unittest.TestCase):
     def test_pslib_1(self):
         """Test cases for pslib."""
         import paddle.fluid as fluid
-        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
         from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
 
         os.environ["POD_IP"] = "127.0.0.1"
         os.environ["PADDLE_PORT"] = "36001"
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py
index 2c343a19c95923c6d90707753f700d70745f1ff4..a657d3deb51a02549ea0a472e2e13ac591675ce2 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 """Test cases for role makers."""
 
-import paddle
 import os
-import unittest
 import tempfile
+import unittest
+
+import paddle
 
 
 class TestCloudRoleMaker2(unittest.TestCase):
@@ -34,11 +35,13 @@ class TestCloudRoleMaker2(unittest.TestCase):
     def test_pslib_2(self):
         """Test cases for pslib."""
         import paddle.fluid as fluid
+        from paddle.fluid.incubate.fleet.base.role_maker import (
+            GeneralRoleMaker,
+            RoleMakerBase,
+        )
         from paddle.fluid.incubate.fleet.parameter_server.distribute_transpiler import (
             fleet,
         )
-        from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
-        from paddle.fluid.incubate.fleet.base.role_maker import RoleMakerBase
 
         paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py
index 0ce1b0743aa92d278da9898e051a14b6a6edacf3..79b5e136f189a95f28e611c12bfb8e4ab18b0742 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py
@@ -32,8 +32,8 @@ class TestCloudRoleMaker(unittest.TestCase):
     def test_pslib_1(self):
         """Test cases for pslib."""
         import paddle.fluid as fluid
-        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
         from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
 
         os.environ["POD_IP"] = "127.0.0.1"
         os.environ["PADDLE_PORT"] = "36001"
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py
index 2825a1232fc0556fbebab9c6a7889c84bab4a221..7f82c904645621c5be50b1b0538eff8f5ba23968 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py
@@ -34,9 +34,11 @@ class TestCloudRoleMaker(unittest.TestCase):
         import threading
 
         try:
-            from paddle.distributed.fleet.utils.http_server import KVHandler
-            from paddle.distributed.fleet.utils.http_server import KVServer
-            from paddle.distributed.fleet.utils.http_server import KVHTTPServer
+            from paddle.distributed.fleet.utils.http_server import (
+                KVHandler,
+                KVHTTPServer,
+                KVServer,
+            )
         except:
             print("warning: no fleet, skip test_pslib_4")
             return
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_init.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_init.py
index f7f2b11acdcb2d01610d0fdd53b744bc2d6bd080..5c3f77a3f6cba717e8edc472590f00c649978209 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_init.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_init.py
@@ -15,6 +15,7 @@
 
 import os
 import unittest
+
 import paddle.distributed.fleet.base.role_maker as role_maker
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_runtime.py b/python/paddle/fluid/tests/unittests/test_fleet_runtime.py
index 4a415f92ca5a16848c587802fe1a29306a0df710..fb60166f887be384a9bcdc79643a4373d979b9c1 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_runtime.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_runtime.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_unitaccessor.py b/python/paddle/fluid/tests/unittests/test_fleet_unitaccessor.py
index d1f4df653280027ebd4574f2aced6565badeee94..9c7736a39384f1e6af26c8c8f4583e65bcf82f18 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_unitaccessor.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_unitaccessor.py
@@ -32,8 +32,8 @@ class TestFleet1(unittest.TestCase):
     def test_pslib_1(self):
         """Test cases for pslib."""
         import paddle.fluid as fluid
-        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
         from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
 
         os.environ["POD_IP"] = "127.0.0.1"
         os.environ["PADDLE_PORT"] = "36001"
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_util.py b/python/paddle/fluid/tests/unittests/test_fleet_util.py
index 383b8ac2ebe4635153440e339c70a648cd6b3502..01d7d6bedeae4c05a6bd5341dbc8cdaf5d81d4d2 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_util.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_util.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
-import tarfile
-import tempfile
 import os
 import sys
-from paddle.dataset.common import download
+import tarfile
+import tempfile
+import unittest
+
+import numpy as np
+
 import paddle.distributed.fleet.base.role_maker as role_maker
+from paddle.dataset.common import download
 
 
 class TestFleetUtil(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_flip.py b/python/paddle/fluid/tests/unittests/test_flip.py
index f5943db87e0c7f8a345cfdb9499258f79c505fd7..f7ebd3d1d54f9534459b8c713a5b4231bbc7ba72 100644
--- a/python/paddle/fluid/tests/unittests/test_flip.py
+++ b/python/paddle/fluid/tests/unittests/test_flip.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import unittest
+
+import gradient_checker
 import numpy as np
+from decorator_helper import prog_scope
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from op_test import OpTest
-import gradient_checker
-from decorator_helper import prog_scope
 import paddle.fluid.layers as layers
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fmax_op.py b/python/paddle/fluid/tests/unittests/test_fmax_op.py
index 986417fede626479379a97dec056c170e6fefb7b..3a84570ffcececbe37ee52725beb583e8152cf97 100644
--- a/python/paddle/fluid/tests/unittests/test_fmax_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fmax_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
-from op_test import OpTest
 
 
 class ApiFMaxTest(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fmin_op.py b/python/paddle/fluid/tests/unittests/test_fmin_op.py
index e1a9cf7a912d7adfb6dbe961d6a2d1c7bc45f6c7..32b203c57418b26361220b1cafc0572a7e9c5723 100644
--- a/python/paddle/fluid/tests/unittests/test_fmin_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fmin_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
-from op_test import OpTest
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_fold_op.py b/python/paddle/fluid/tests/unittests/test_fold_op.py
index 1b2cc9d149c7aab1788c6e34d7ad304e3b91df74..71f69aa6d6745fc593806052000171f53c7088f8 100644
--- a/python/paddle/fluid/tests/unittests/test_fold_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fold_op.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
+
+import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
@@ -157,8 +159,8 @@ class TestFoldAPI(TestFoldOp):
 
 class TestFoldOpError(unittest.TestCase):
     def test_errors(self):
-        from paddle.nn.functional import fold
         from paddle.fluid.framework import Program, program_guard
+        from paddle.nn.functional import fold
 
         with program_guard(Program(), Program()):
 
diff --git a/python/paddle/fluid/tests/unittests/test_frac_api.py b/python/paddle/fluid/tests/unittests/test_frac_api.py
index b455dbbdb4ddcea7288567d6c035f225afc5623a..2e705bb2d7fad16478d599c019efe3e9e0aeee3d 100644
--- a/python/paddle/fluid/tests/unittests/test_frac_api.py
+++ b/python/paddle/fluid/tests/unittests/test_frac_api.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_frame_op.py b/python/paddle/fluid/tests/unittests/test_frame_op.py
index fc0c092e91e6397b5453b4ecf1186b8a0cabb2f1..89551b2ccc121ef075b8cdb861b19cfc448a9ec1 100644
--- a/python/paddle/fluid/tests/unittests/test_frame_op.py
+++ b/python/paddle/fluid/tests/unittests/test_frame_op.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-from numpy.lib.stride_tricks import as_strided
-import paddle
 import unittest
 
+import numpy as np
+from numpy.lib.stride_tricks import as_strided
 from op_test import OpTest
 
+import paddle
+
 
 def frame_from_librosa(x, frame_length, hop_length, axis=-1):
     if axis == -1 and not x.flags["C_CONTIGUOUS"]:
diff --git a/python/paddle/fluid/tests/unittests/test_framework_debug_str.py b/python/paddle/fluid/tests/unittests/test_framework_debug_str.py
index 6a1e72c072ac2d0eafe7a54add0ff645c183c93b..ef9f294055b46a169120b4258813071347aed81d 100644
--- a/python/paddle/fluid/tests/unittests/test_framework_debug_str.py
+++ b/python/paddle/fluid/tests/unittests/test_framework_debug_str.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from paddle.fluid.framework import Program
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_frexp_api.py b/python/paddle/fluid/tests/unittests/test_frexp_api.py
index 9604080ffd41ef0e8361f9cdd2deb84a7278b77a..230afc993ae7f2a229e1cd9ba71c6120faf2e1e6 100644
--- a/python/paddle/fluid/tests/unittests/test_frexp_api.py
+++ b/python/paddle/fluid/tests/unittests/test_frexp_api.py
@@ -12,7 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_fs_interface.py b/python/paddle/fluid/tests/unittests/test_fs_interface.py
index 4705e44eba62b927947961493258c93a8dd81876..dc2a5f1b8e91e7f263e16176c099a4d173a483ff 100644
--- a/python/paddle/fluid/tests/unittests/test_fs_interface.py
+++ b/python/paddle/fluid/tests/unittests/test_fs_interface.py
@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import inspect
+import unittest
 
 from paddle.distributed.fleet.utils.fs import FS
 
diff --git a/python/paddle/fluid/tests/unittests/test_fsp_op.py b/python/paddle/fluid/tests/unittests/test_fsp_op.py
index 3a1de0833a6ff0af612dc3be306e7f2b34bfd074..3e325d189148bda1b6d3ec2ec9eac5df558bab6b 100644
--- a/python/paddle/fluid/tests/unittests/test_fsp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fsp_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_ftrl_op.py b/python/paddle/fluid/tests/unittests/test_ftrl_op.py
index e346b4f2d118edbaf1fba221aaff3ea32c6e92b9..23081125491a0e34d7fea47776296e2a2069e389 100644
--- a/python/paddle/fluid/tests/unittests/test_ftrl_op.py
+++ b/python/paddle/fluid/tests/unittests/test_ftrl_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle.fluid.core as core
 from paddle.fluid.op import Operator
-from op_test import OpTest
 
 
 def ftrl_step(param, grad, rows, sq_accum, lin_accum, lr, l1, l2, lr_power):
diff --git a/python/paddle/fluid/tests/unittests/test_full_like_op.py b/python/paddle/fluid/tests/unittests/test_full_like_op.py
index c24ee6791b14a9d4419c441a91278872118caeb8..5a4b1235d8dd285adcf0d089ba46230f329037c8 100644
--- a/python/paddle/fluid/tests/unittests/test_full_like_op.py
+++ b/python/paddle/fluid/tests/unittests/test_full_like_op.py
@@ -12,14 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid.core as core
-from paddle.static import program_guard, Program
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from paddle.fluid.framework import convert_np_dtype_to_dtype_
-from paddle.fluid.framework import _test_eager_guard
+
+import paddle
+import paddle.fluid.core as core
+from paddle.fluid.framework import _test_eager_guard, convert_np_dtype_to_dtype_
+from paddle.static import Program, program_guard
 
 
 class TestFullOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_full_op.py b/python/paddle/fluid/tests/unittests/test_full_op.py
index a8c54188e48bbdbe5e11fce47df10c0032f66a77..35474810da77bc407abb6aa1cf38d4ca592352e0 100644
--- a/python/paddle/fluid/tests/unittests/test_full_op.py
+++ b/python/paddle/fluid/tests/unittests/test_full_op.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
-import paddle.fluid as fluid
 import paddle
+import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_function_hook.py b/python/paddle/fluid/tests/unittests/test_function_hook.py
index 7ba230233a4152cbcdafe4e594cb75da5eff27d0..b6adc83a7489590b855624fe4a152bc6d9ec6ee0 100644
--- a/python/paddle/fluid/tests/unittests/test_function_hook.py
+++ b/python/paddle/fluid/tests/unittests/test_function_hook.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
 
+import paddle
 from paddle import _legacy_C_ops
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_functional_conv1d.py b/python/paddle/fluid/tests/unittests/test_functional_conv1d.py
index 6869c511b9fbef569b64a5a7b65b290d8d219c28..0bd7fa1878d414776e2f48eedf58c8c2842edab5 100644
--- a/python/paddle/fluid/tests/unittests/test_functional_conv1d.py
+++ b/python/paddle/fluid/tests/unittests/test_functional_conv1d.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.nn.functional as F
-import paddle.fluid.dygraph as dg
-import numpy as np
 import unittest
 from unittest import TestCase
 
+import numpy as np
+
+import paddle
+import paddle.fluid.dygraph as dg
+import paddle.nn.functional as F
+
 
 class TestFunctionalConv1DError(TestCase):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_functional_conv1d_transpose.py b/python/paddle/fluid/tests/unittests/test_functional_conv1d_transpose.py
index 431c940f0b4a57d7b07c0872b0100208d83cf190..a1e144da146a57ae277d40b381682bc458cffab7 100644
--- a/python/paddle/fluid/tests/unittests/test_functional_conv1d_transpose.py
+++ b/python/paddle/fluid/tests/unittests/test_functional_conv1d_transpose.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.nn.functional as F
-import paddle.fluid.dygraph as dg
-import numpy as np
 import unittest
 from unittest import TestCase
 
+import numpy as np
+
+import paddle
+import paddle.fluid.dygraph as dg
+import paddle.nn.functional as F
+
 
 class TestFunctionalConv1DError(TestCase):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_functional_conv2d.py b/python/paddle/fluid/tests/unittests/test_functional_conv2d.py
index 1a92a9babb727590a958bd4e06d2e97baf4c89df..2e2dcd5baf52c90f4231cb317f0d57a2465fc488 100644
--- a/python/paddle/fluid/tests/unittests/test_functional_conv2d.py
+++ b/python/paddle/fluid/tests/unittests/test_functional_conv2d.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+from unittest import TestCase
+
+import numpy as np
+
 import paddle
-import paddle.nn.functional as F
-from paddle import fluid
 import paddle.fluid.dygraph as dg
 import paddle.fluid.initializer as I
-import numpy as np
-import unittest
-from unittest import TestCase
+import paddle.nn.functional as F
+from paddle import fluid
 
 
 class TestFunctionalConv2D(TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_functional_conv2d_transpose.py b/python/paddle/fluid/tests/unittests/test_functional_conv2d_transpose.py
index d45f13e4c9576017039cecfc861815d7464a047b..a66713eaee5830b9db39e9bd87d4dbcadfe75666 100644
--- a/python/paddle/fluid/tests/unittests/test_functional_conv2d_transpose.py
+++ b/python/paddle/fluid/tests/unittests/test_functional_conv2d_transpose.py
@@ -12,15 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+from unittest import TestCase
+
 import numpy as np
+
+import paddle
 import paddle.fluid.dygraph as dg
 import paddle.fluid.initializer as I
 import paddle.nn.functional as F
 from paddle import fluid
 from paddle.fluid.framework import _test_eager_guard
-from unittest import TestCase
 
 
 class TestFunctionalConv2D(TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_functional_conv3d.py b/python/paddle/fluid/tests/unittests/test_functional_conv3d.py
index 71123cb51e74b8e1d7fd9fe1a9e1d39d395940ad..bdd8360f9717452f92cd4f881f280a6777d37a59 100644
--- a/python/paddle/fluid/tests/unittests/test_functional_conv3d.py
+++ b/python/paddle/fluid/tests/unittests/test_functional_conv3d.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+from unittest import TestCase
+
+import numpy as np
+
 import paddle
-import paddle.nn.functional as F
-from paddle import fluid
 import paddle.fluid.dygraph as dg
 import paddle.fluid.initializer as I
-import numpy as np
-import unittest
-from unittest import TestCase
+import paddle.nn.functional as F
+from paddle import fluid
 
 
 class TestFunctionalConv3D(TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_functional_conv3d_transpose.py b/python/paddle/fluid/tests/unittests/test_functional_conv3d_transpose.py
index 3c013fe873396de0b262d60824b32bd01fc0ab0e..4c944d4fa3d1f41a1ca9e37765481f2dfb6d7505 100644
--- a/python/paddle/fluid/tests/unittests/test_functional_conv3d_transpose.py
+++ b/python/paddle/fluid/tests/unittests/test_functional_conv3d_transpose.py
@@ -12,15 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
+import unittest
+from unittest import TestCase
+
 import numpy as np
+
+import paddle
 import paddle.fluid.dygraph as dg
 import paddle.fluid.initializer as I
 import paddle.nn.functional as F
-import unittest
 from paddle import fluid
 from paddle.fluid.framework import _test_eager_guard
-from unittest import TestCase
 
 
 class TestFunctionalConv3DTranspose(TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_all_reduce_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_all_reduce_pass.py
index 9431bcac4e34acbf7e572e3c624e12869b9f0358..4566c9e97a9ad4404bbce934dc1c521281a65acc 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_all_reduce_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_all_reduce_pass.py
@@ -12,15 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from simple_nets import simple_fc_net, fc_with_batchnorm, init_data, bow_net
+import os
+import unittest
+from functools import partial
+
 from fake_reader import fake_imdb_reader
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
+from simple_nets import bow_net, fc_with_batchnorm, init_data, simple_fc_net
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from functools import partial
-import paddle
-import unittest
-import os
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_bn_act_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_bn_act_pass.py
index 5018b7bd5e43b6d8bd69615b55a1974f7b0b651f..a04e845db0af43db27363c9dea25daf199a4a1c8 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_bn_act_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_bn_act_pass.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.fluid as fluid
-import unittest
 
 
 class TestFuseBatchNormActPass(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_bn_add_act_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_bn_add_act_pass.py
index 47c2a1a5f16cdb94993c2ca9f0e2729049f2e663..68d11d0897279a5836657fe995ad22bb0abd153d 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_bn_add_act_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_bn_add_act_pass.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_elewise_add_act_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_elewise_add_act_pass.py
index bc052ec1cf7225ed711617d1d8f2e07dbcf470cf..9a33552f31af8e57ec7d739eb8b61a641f49d829 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_elewise_add_act_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_elewise_add_act_pass.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from simple_nets import simple_fc_net, fc_with_batchnorm, init_data
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
+import os
+import unittest
+
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
+from simple_nets import fc_with_batchnorm, init_data, simple_fc_net
+
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import unittest
-import os
 
 
 class TestMNIST(TestParallelExecutorBase):
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_gemm_epilogue_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_gemm_epilogue_pass.py
index 6595d709d26e137fffda3553f86627f8ee3d5c90..a3141128a54d31feb0347adfd42fd5669d292237 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_gemm_epilogue_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_gemm_epilogue_pass.py
@@ -14,9 +14,11 @@
 # limitations under the License.
 """Test cases for role makers."""
 
-import paddle
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid.core as core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_optimizer_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_optimizer_pass.py
index 9fd6fcc276ecfdab5dac43ee2313bb3c8ffc1fc5..fe4baed3271bb40dcd203f3526e8f640d2701b4a 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_optimizer_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_optimizer_pass.py
@@ -12,15 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from simple_nets import bow_net, fc_with_batchnorm, init_data
-from fake_reader import fake_imdb_reader
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
+import os
+import unittest
 from functools import partial
+
+from fake_reader import fake_imdb_reader
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
+from simple_nets import bow_net, fc_with_batchnorm, init_data
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import unittest
-import os
 
 
 class TestFuseOptimizationOps(TestParallelExecutorBase):
diff --git a/python/paddle/fluid/tests/unittests/test_fuse_relu_depthwise_conv_pass.py b/python/paddle/fluid/tests/unittests/test_fuse_relu_depthwise_conv_pass.py
index 54eacb5ec0d8f7c788883e8a7f3b591e0973298e..ed7cb760f053898720d53177aa9ad9a12f784599 100644
--- a/python/paddle/fluid/tests/unittests/test_fuse_relu_depthwise_conv_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_fuse_relu_depthwise_conv_pass.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
-import paddle.fluid as fluid
-import paddle.fluid.core as core
+import unittest
+
 import numpy as np
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
+
 import paddle
-import unittest
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 def norm(*args, **kargs):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_attention_op.py b/python/paddle/fluid/tests/unittests/test_fused_attention_op.py
index 6e3c0014422670a54de62d78d51708e506eacf34..a73dae327117c898009d13ee34375f43b9ce457f 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_attention_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_attention_op.py
@@ -12,19 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+from op_test import OpTest
 
 import paddle
-import paddle.nn.functional as F
 import paddle.incubate.nn.functional as incubate_f
-from paddle.nn.layer.norm import LayerNorm
-from paddle.nn.layer.common import Linear, Dropout
-from paddle.nn.layer.transformer import _convert_attention_mask
+import paddle.nn.functional as F
 from paddle import tensor
 from paddle.fluid import layers
-import unittest
-from op_test import OpTest
 from paddle.fluid.framework import default_main_program
+from paddle.nn.layer.common import Dropout, Linear
+from paddle.nn.layer.norm import LayerNorm
+from paddle.nn.layer.transformer import _convert_attention_mask
 
 default_main_program().random_seed = 42
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_attention_op_api.py b/python/paddle/fluid/tests/unittests/test_fused_attention_op_api.py
index 3a3872bb6726f429c9b55e5f57b1db7b88e6d63d..0917e8b96a91dcdaca623a7c073fd9058bfb41b1 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_attention_op_api.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_attention_op_api.py
@@ -12,12 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
 
 import paddle
 from paddle.incubate.nn.layer.fused_transformer import FusedMultiHeadAttention
 from paddle.static import Program
-import unittest
 
 
 def fc(x, weight):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op.py b/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op.py
index 8ae92fe194f35b7c1d5bd36a50d11be020deae35..3cd611931fadded2173746db7619855d1e59917b 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op.py
@@ -12,15 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+from op_test import OpTest
 
 import paddle
 import paddle.incubate.nn.functional as incubate_f
-from paddle.nn.layer.norm import LayerNorm
+from paddle.fluid.framework import _enable_legacy_dygraph, default_main_program
 from paddle.nn.layer.common import Dropout
-import unittest
-from op_test import OpTest
-from paddle.fluid.framework import default_main_program, _enable_legacy_dygraph
+from paddle.nn.layer.norm import LayerNorm
 
 _enable_legacy_dygraph()
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op_api.py b/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op_api.py
index 261a2686b271cd18da4c4883f5b42f592ab627db..dae2f2ba61c886beb05685e2800842fa56e73537 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op_api.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_bias_dropout_residual_layer_norm_op_api.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
 
 import paddle
@@ -19,7 +21,6 @@ from paddle.incubate.nn.layer.fused_transformer import (
     FusedBiasDropoutResidualLayerNorm,
 )
 from paddle.static import Program
-import unittest
 
 
 def layer_norm(x, has_scale, has_bias, weight, bias, epsilon=1e-05):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_elemwise_activation_op.py b/python/paddle/fluid/tests/unittests/test_fused_elemwise_activation_op.py
index cc672f5a16f02f3c1c4b91f9f3c24e76348c42b9..dfa2bf6fc3452fc38869b65f19231722e2c6e3a4 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_elemwise_activation_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_elemwise_activation_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 from functools import partial
-import paddle.fluid.core as core
+
+import numpy as np
 from op_test import OpTest
 
+import paddle.fluid.core as core
+
 #   TestFusedElementwiseActivationOp
 #   TestFusedElementwiseActivationOp_scalar
 #   TestFusedElementwiseActivationOp_scalar2
diff --git a/python/paddle/fluid/tests/unittests/test_fused_emb_seq_pool_op.py b/python/paddle/fluid/tests/unittests/test_fused_emb_seq_pool_op.py
index 392c04f730a3f74f1a8844a0b6db81004555114b..3e3f0ca05a62f281c1f56f85ed2e044580a73f14 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_emb_seq_pool_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_emb_seq_pool_op.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import platform
+import unittest
+
 import numpy as np
 from op_test import OpTest, skip_check_grad_ci
+
 import paddle.version as ver
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_embedding_fc_lstm_op.py b/python/paddle/fluid/tests/unittests/test_fused_embedding_fc_lstm_op.py
index 54fc4d77b7921557341dff2b46202f69437492b6..cc9dd6a17565ded592c79a97e926eb308ace9223 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_embedding_fc_lstm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_embedding_fc_lstm_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from test_lstm_op import lstm, ACTIVATION
+from test_lstm_op import ACTIVATION, lstm
 
 
 def fc(x, w, b):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_fc_elementwise_layernorm_op.py b/python/paddle/fluid/tests/unittests/test_fused_fc_elementwise_layernorm_op.py
index 09797b038491988c149ae2816d4a5d893b9134bf..7b07e559c8cd2c9d17ae9493d63997c87806e984 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_fc_elementwise_layernorm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_fc_elementwise_layernorm_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from paddle.fluid import core
-from test_fc_op import fc_refer, MatrixGenerate
+from test_fc_op import MatrixGenerate, fc_refer
 from test_layer_norm_op import _reference_layer_norm_naive
 
+from paddle.fluid import core
+
 np.random.random(123)
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_feedforward_op.py b/python/paddle/fluid/tests/unittests/test_fused_feedforward_op.py
index a745ec57c154936fd548595be8af4731d846c674..5153425b18aa73034368a157356cbd3b874fcea9 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_feedforward_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_feedforward_op.py
@@ -11,17 +11,18 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import unittest
+
 import numpy as np
+from op_test import OpTest
 
 import paddle
-from paddle.nn.layer import transformer
-import paddle.nn.functional as F
 import paddle.incubate.nn.functional as incubate_f
-from paddle.nn.layer.norm import LayerNorm
-from paddle.nn.layer.common import Linear, Dropout
-import unittest
-from op_test import OpTest
+import paddle.nn.functional as F
 from paddle.fluid.framework import default_main_program
+from paddle.nn.layer import transformer
+from paddle.nn.layer.common import Dropout, Linear
+from paddle.nn.layer.norm import LayerNorm
 
 
 class TestFusedFFNOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_gate_attention_op.py b/python/paddle/fluid/tests/unittests/test_fused_gate_attention_op.py
index 1eed59690d88dd57db9c0c6d4cb70a6036dc0fd3..0a7ca81f216d80cef8a038d106ba1db729551184 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_gate_attention_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_gate_attention_op.py
@@ -17,13 +17,14 @@ import os
 os.environ['NVIDIA_TF32_OVERRIDE'] = "0"
 os.environ['FLAGS_new_einsum'] = "0"
 
+import unittest
+
 import numpy as np
+from op_test import OpTest, convert_float_to_uint16, convert_uint16_to_float
+from test_sparse_attention_op import get_cuda_version
 
 import paddle
 import paddle.nn as nn
-import unittest
-from op_test import OpTest, convert_float_to_uint16, convert_uint16_to_float
-from test_sparse_attention_op import get_cuda_version
 from paddle import _legacy_C_ops
 from paddle.fluid import core
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_grad_op.py b/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_grad_op.py
index 322e63dd4fd45ac3dd2f6107b9546ba868faf405..21b6d7e29cfea94117b067e87698c2656490401a 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_grad_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_grad_op.py
@@ -14,10 +14,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest, skip_check_grad_ci
+
 import paddle
 import paddle.fluid.core as core
-from op_test import OpTest, skip_check_grad_ci
 
 
 def get_outputs(DOut, X, Y):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_op.py b/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_op.py
index a3af9cc194f73b3c1e902b433c6c5c6fecdec68b..eb03509ee9e05513471ba3a8c6850a6f91461e76 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_gemm_epilogue_op.py
@@ -14,10 +14,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest, skip_check_grad_ci, skip_check_inplace_ci
+
 import paddle
 import paddle.fluid.core as core
-from op_test import OpTest, skip_check_grad_ci, skip_check_inplace_ci
 
 
 def is_fused_gemm_epilogue_supported():
diff --git a/python/paddle/fluid/tests/unittests/test_fused_matmul_bias.py b/python/paddle/fluid/tests/unittests/test_fused_matmul_bias.py
index 53ef3610d6fde6ac21993eb83ce2c67ca30b3d65..5cbbabbee2495970ef06daff2b213faf6a740ec6 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_matmul_bias.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_matmul_bias.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid.core as core
 import unittest
+
 import numpy as np
-from paddle.incubate.nn.functional import fused_matmul_bias, fused_linear
+
+import paddle
+import paddle.fluid.core as core
 from paddle.incubate.nn import FusedLinear
+from paddle.incubate.nn.functional import fused_linear, fused_matmul_bias
 
 
 def is_fused_matmul_bias_supported():
diff --git a/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_int8_op.py b/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_int8_op.py
index e3fb41412fd3900d26a942aee130afe65d943b01..3f91f9b6e6d90d76147b16926cb10bb2668441aa 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_int8_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_int8_op.py
@@ -12,19 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
 
 import paddle
 import paddle.nn.functional as F
-from paddle.nn.layer.norm import LayerNorm
-from paddle.nn.layer.common import Dropout
-from paddle.nn.layer.transformer import _convert_attention_mask
-from paddle import tensor
+from paddle import _legacy_C_ops, tensor
 from paddle.fluid import layers
-import unittest
-from paddle.fluid.framework import default_main_program
 from paddle.fluid.framework import default_main_program
-from paddle import _legacy_C_ops
+from paddle.nn.layer.common import Dropout
+from paddle.nn.layer.norm import LayerNorm
+from paddle.nn.layer.transformer import _convert_attention_mask
 
 default_main_program().random_seed = 42
 np.random.seed(0)
diff --git a/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_op.py b/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_op.py
index 0daf8342294f4f74e8cdd4591b1ba1f22363cff8..199c1e48bb324e6b2953f6c018506c4a3649418f 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_multi_transformer_op.py
@@ -12,21 +12,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+from op_test import OpTest
 
 import paddle
 import paddle.nn.functional as F
-from paddle.nn.layer.norm import LayerNorm
-from paddle.nn.layer.common import Linear, Dropout
-from paddle.nn.layer.transformer import _convert_attention_mask
 from paddle import tensor
 from paddle.fluid import layers
-import unittest
-from op_test import OpTest
-from paddle.fluid.framework import default_main_program
 from paddle.fluid.framework import default_main_program
-from paddle.incubate.nn.functional import fused_multi_transformer
 from paddle.incubate.nn import FusedMultiTransformer
+from paddle.incubate.nn.functional import fused_multi_transformer
+from paddle.nn.layer.common import Dropout, Linear
+from paddle.nn.layer.norm import LayerNorm
+from paddle.nn.layer.transformer import _convert_attention_mask
 
 default_main_program().random_seed = 42
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_multihead_matmul_op.py b/python/paddle/fluid/tests/unittests/test_fused_multihead_matmul_op.py
index 55c2a563c8cdf9c223d0595e9ac067ec11011a88..06f3debb3872bcfda34df4a3f960a7a68adc6d0f 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_multihead_matmul_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_multihead_matmul_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 from paddle.fluid import core
 
 np.random.random(123)
diff --git a/python/paddle/fluid/tests/unittests/test_fused_token_prune_op.py b/python/paddle/fluid/tests/unittests/test_fused_token_prune_op.py
index 22d0fe4ba761dfe13069804c7c879a067427217b..c29766123d15e97e9103607a68f0799cf71b8865 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_token_prune_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_token_prune_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 from paddle.framework import core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_fused_transformer_encoder_layer.py b/python/paddle/fluid/tests/unittests/test_fused_transformer_encoder_layer.py
index a8a349265b46ce7521e8d3ac4df10796ae989994..c4b0a47420a1a8d2d7eb7004778fd430959ce228 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_transformer_encoder_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_transformer_encoder_layer.py
@@ -11,13 +11,14 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import unittest
+
 import numpy as np
 
 import paddle
+from paddle.fluid.framework import default_main_program, in_dygraph_mode
 from paddle.incubate.nn import FusedTransformerEncoderLayer
 from paddle.nn import TransformerEncoderLayer
-from paddle.fluid.framework import default_main_program, in_dygraph_mode
-import unittest
 
 
 class TestFusedTransformerEncoderLayer(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_fused_transformer_with_amp_decorator.py b/python/paddle/fluid/tests/unittests/test_fused_transformer_with_amp_decorator.py
index 199ebc15f86269cc7b54428612a996d19c328b18..a2a6a958761047d6a58f6e901c4efe5cab6fbc5e 100644
--- a/python/paddle/fluid/tests/unittests/test_fused_transformer_with_amp_decorator.py
+++ b/python/paddle/fluid/tests/unittests/test_fused_transformer_with_amp_decorator.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import paddle
 import paddle.nn as nn
 from paddle.incubate.nn.layer.fused_transformer import (
-    FusedMultiHeadAttention,
     FusedFeedForward,
+    FusedMultiHeadAttention,
 )
-import unittest
 
 
 class PreModel(nn.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_gru_op.py b/python/paddle/fluid/tests/unittests/test_fusion_gru_op.py
index 68777ca256757f3757a50a935ec1ee8b4a2628c4..36f9e1d02001acc138dc0791bb4fe9a8cd7b1779 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_gru_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_gru_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
+from paddle.fluid.tests.unittests.test_fusion_lstm_op import ACTIVATION, fc
 from paddle.fluid.tests.unittests.test_gru_op import gru
-from paddle.fluid.tests.unittests.test_fusion_lstm_op import fc, ACTIVATION
 
 
 def fusion_gru(
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_lstm_op.py b/python/paddle/fluid/tests/unittests/test_fusion_lstm_op.py
index fcde3d2f5db6643bc7612b438b0d4e907b1d2022..9dc930c21a6f85fb323e3edfd9df1b3202c40cb6 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_lstm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_lstm_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from paddle.fluid.tests.unittests.test_lstm_op import lstm, ACTIVATION
+
+from paddle.fluid.tests.unittests.test_lstm_op import ACTIVATION, lstm
 
 
 def fc(x, w, b):
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_repeated_fc_relu_op.py b/python/paddle/fluid/tests/unittests/test_fusion_repeated_fc_relu_op.py
index c58570d9de9927282bb1a2149b9f82958e056a90..431d67e1d0097548e92ea804a7dddf3bee55ad59 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_repeated_fc_relu_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_repeated_fc_relu_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from test_fc_op import fc_refer, MatrixGenerate
+from test_fc_op import MatrixGenerate, fc_refer
 
 
 class TestFusionRepeatedFCReluOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_seqconv_eltadd_relu_op.py b/python/paddle/fluid/tests/unittests/test_fusion_seqconv_eltadd_relu_op.py
index 91ed3f564429e1505a8d47ddb602782dfca415b1..4ebea360ecc96824dac63abed9b3ef5c95659296 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_seqconv_eltadd_relu_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_seqconv_eltadd_relu_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 from sequence.test_sequence_conv import seqconv
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_seqexpand_concat_fc_op.py b/python/paddle/fluid/tests/unittests/test_fusion_seqexpand_concat_fc_op.py
index 10a8623ec9c1d3786e11d2077280018561eb8b6a..d3cf473320a3fc16a07d8d1c815818ee937e8e75 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_seqexpand_concat_fc_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_seqexpand_concat_fc_op.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from test_fusion_lstm_op import fc, ACTIVATION
+from test_fusion_lstm_op import ACTIVATION, fc
 
 
 def fusion_seqexpand_concat_fc(xs, lod, w, b, fc_act):
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_seqpool_concat_op.py b/python/paddle/fluid/tests/unittests/test_fusion_seqpool_concat_op.py
index c1c815ae146ef37782c49474428b24472eaababe..ce0eaff4e06bbbd29fea40957d4af8d0a2d9df57 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_seqpool_concat_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_seqpool_concat_op.py
@@ -13,14 +13,15 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from test_reorder_lod_tensor import convert_to_offset
 from sequence.test_sequence_pool import (
-    compute_seqpool_sum,
     compute_seqpool_avg,
     compute_seqpool_sqrt,
+    compute_seqpool_sum,
 )
+from test_reorder_lod_tensor import convert_to_offset
 
 
 class TestFusionSeqPoolConcatOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_seqpool_cvm_concat_op.py b/python/paddle/fluid/tests/unittests/test_fusion_seqpool_cvm_concat_op.py
index 524ed99aa5a7fa7985525bfcb0011baae949268d..02e3a48e12a854e4fe8fc2c5f2ca496a2afe61ed 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_seqpool_cvm_concat_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_seqpool_cvm_concat_op.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-from test_reorder_lod_tensor import convert_to_offset
 from sequence.test_sequence_pool import (
-    compute_seqpool_sum,
     compute_seqpool_avg,
     compute_seqpool_sqrt,
+    compute_seqpool_sum,
 )
 from test_cvm_op import cvm_compute
+from test_reorder_lod_tensor import convert_to_offset
 
 
 class TestFusionSeqPoolCVMConcatOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_squared_mat_sub_op.py b/python/paddle/fluid/tests/unittests/test_fusion_squared_mat_sub_op.py
index 2a6098a8a6a066ed35c76ce5a1e694969f887e3d..a9c692e538261743bea5a1843968072bc11283b5 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_squared_mat_sub_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_squared_mat_sub_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_fusion_transpose_flatten_concat_op.py b/python/paddle/fluid/tests/unittests/test_fusion_transpose_flatten_concat_op.py
index 768bbec552dbfe5a6c3288d0cdbe986b51206aed..9dbdc979f5fe24b1733d5906aeebab0c711fd956 100644
--- a/python/paddle/fluid/tests/unittests/test_fusion_transpose_flatten_concat_op.py
+++ b/python/paddle/fluid/tests/unittests/test_fusion_transpose_flatten_concat_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid.core as core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_gast_with_compatibility.py b/python/paddle/fluid/tests/unittests/test_gast_with_compatibility.py
index b098dcf4e16486473177ed1836d12b4371e98c14..aac53d3875c325b9eacffc381dea02d6bbe8bbf2 100644
--- a/python/paddle/fluid/tests/unittests/test_gast_with_compatibility.py
+++ b/python/paddle/fluid/tests/unittests/test_gast_with_compatibility.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 
 import ast
-from paddle.utils import gast
 import sys
 import textwrap
 import unittest
 
+from paddle.utils import gast
+
 
 class GastNodeTransformer(gast.NodeTransformer):
     def __init__(self, root):
diff --git a/python/paddle/fluid/tests/unittests/test_gather_nd_op.py b/python/paddle/fluid/tests/unittests/test_gather_nd_op.py
index 20fc57ff023685f34ba095971cdd2740996c9e32..6a3f5cf8556809bbecbda4cc18bd50d56e49ccb4 100644
--- a/python/paddle/fluid/tests/unittests/test_gather_nd_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gather_nd_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 
 
 class TestGatherNdOpWithEmptyIndex(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_gather_op.py b/python/paddle/fluid/tests/unittests/test_gather_op.py
index 4f722c8bdc2131a98dd866ff83626ca6db3be2fd..44ab250c7652c223affcf5f3f15190d73256a2e6 100644
--- a/python/paddle/fluid/tests/unittests/test_gather_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gather_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, convert_float_to_uint16
+
 import paddle
 import paddle.fluid as fluid
-from paddle.framework import core
 from paddle.fluid.dygraph.base import switch_to_static_graph
+from paddle.framework import core
 
 
 def gather_numpy(x, index, axis):
diff --git a/python/paddle/fluid/tests/unittests/test_gather_tree_op.py b/python/paddle/fluid/tests/unittests/test_gather_tree_op.py
index 18fb61c69f1ebb2a902e9fd43d457ad558240369..1af5776cd60e58c63761c9ac3dbd45d458fe99d5 100644
--- a/python/paddle/fluid/tests/unittests/test_gather_tree_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gather_tree_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid.framework import program_guard, Program
+from paddle.fluid.framework import Program, program_guard
 
 
 class TestGatherTreeOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_gaussian_random_op.py b/python/paddle/fluid/tests/unittests/test_gaussian_random_op.py
index c3ecf7303c17587835f42440b3c2900d80299b7e..b0fb623502ed398d0e66f47b95bfb32a72491ba2 100644
--- a/python/paddle/fluid/tests/unittests/test_gaussian_random_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gaussian_random_op.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.tests.unittests.op_test import OpTest, convert_uint16_to_float
 from paddle.fluid.framework import _test_eager_guard
-import paddle
+from paddle.fluid.tests.unittests.op_test import OpTest, convert_uint16_to_float
 
 
 class TestGaussianRandomOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_gcd.py b/python/paddle/fluid/tests/unittests/test_gcd.py
index 7a2d02dcb81128354a891188e883bcdd7959b728..6b600d9c6f12e0f9786e869c239f23661b8c9b2a 100644
--- a/python/paddle/fluid/tests/unittests/test_gcd.py
+++ b/python/paddle/fluid/tests/unittests/test_gcd.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_gelu_op.py b/python/paddle/fluid/tests/unittests/test_gelu_op.py
index e8999b7ba967979f0ce03b855329c43f6c686abd..63cf1c0c2128121ddd4efa42121bc06cc5e8d51a 100644
--- a/python/paddle/fluid/tests/unittests/test_gelu_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gelu_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from scipy.special import erf
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.dygraph as dg
-import paddle
 import paddle.nn.functional as F
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_generate_mask_labels_op.py b/python/paddle/fluid/tests/unittests/test_generate_mask_labels_op.py
index a2121ee3ef50b26bd7af3d2042d1e5f8ade25694..12a1fa082e4bc79de8e0e0af551cd98b60399e49 100644
--- a/python/paddle/fluid/tests/unittests/test_generate_mask_labels_op.py
+++ b/python/paddle/fluid/tests/unittests/test_generate_mask_labels_op.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
-import math
 from op_test import OpTest
 
 '''
diff --git a/python/paddle/fluid/tests/unittests/test_generate_proposal_labels_op.py b/python/paddle/fluid/tests/unittests/test_generate_proposal_labels_op.py
index 8027234ce5bbc70d6756fa83c755c7965c7a9446..493f9d6168b8d3242b43df5cd65a2c223a2e6cf9 100644
--- a/python/paddle/fluid/tests/unittests/test_generate_proposal_labels_op.py
+++ b/python/paddle/fluid/tests/unittests/test_generate_proposal_labels_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_generate_proposals_op.py b/python/paddle/fluid/tests/unittests/test_generate_proposals_op.py
index 8a23973ede38ac3f2c2b2145f4d3747b7c0eba62..a2438b347949bdd0a26223bfbeea740d1572de92 100644
--- a/python/paddle/fluid/tests/unittests/test_generate_proposals_op.py
+++ b/python/paddle/fluid/tests/unittests/test_generate_proposals_op.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import copy
+import math
 import unittest
+
 import numpy as np
-import math
-import paddle
 from op_test import OpTest
 from test_anchor_generator_op import anchor_generator_in_python
-import copy
+
+import paddle
 
 
 def generate_proposals_in_python(
diff --git a/python/paddle/fluid/tests/unittests/test_generate_proposals_v2_op.py b/python/paddle/fluid/tests/unittests/test_generate_proposals_v2_op.py
index f0b5d56114167a0c56c48f2cb7da286cce798166..a63acb8c9c6f14d0c839516ae8dcf158993bebaf 100644
--- a/python/paddle/fluid/tests/unittests/test_generate_proposals_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_generate_proposals_v2_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 from test_anchor_generator_op import anchor_generator_in_python
-from test_generate_proposals_op import clip_tiled_boxes, box_coder, nms
+from test_generate_proposals_op import box_coder, clip_tiled_boxes, nms
+
+import paddle
 
 
 def python_generate_proposals_v2(
diff --git a/python/paddle/fluid/tests/unittests/test_generator.py b/python/paddle/fluid/tests/unittests/test_generator.py
index 5adef46fc5de2659c86749ebeadeb570c851486e..d8c03d4286f2a44bbe3d374bf3625b76beb044b1 100644
--- a/python/paddle/fluid/tests/unittests/test_generator.py
+++ b/python/paddle/fluid/tests/unittests/test_generator.py
@@ -14,6 +14,7 @@
 """Test cloud role maker."""
 
 import unittest
+
 import paddle
 import paddle.fluid.generator as generator
 
diff --git a/python/paddle/fluid/tests/unittests/test_generator_dataloader.py b/python/paddle/fluid/tests/unittests/test_generator_dataloader.py
index 67b2c37accb703153c94a9cd4eb94ae24196ae17..22114853e9e86c59d682c22067f73eac5b9a8f25 100644
--- a/python/paddle/fluid/tests/unittests/test_generator_dataloader.py
+++ b/python/paddle/fluid/tests/unittests/test_generator_dataloader.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import numpy as np
 import time
 import unittest
+
+import numpy as np
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.reader import DataLoaderBase
 
 EPOCH_NUM = 20
diff --git a/python/paddle/fluid/tests/unittests/test_get_all_op_or_kernel_names.py b/python/paddle/fluid/tests/unittests/test_get_all_op_or_kernel_names.py
index 47af7355cb7e2ac41bbec86ac04b24b06f5773a1..8ee2d2cb0f5690b5c209a957431385aba1cc5d00 100644
--- a/python/paddle/fluid/tests/unittests/test_get_all_op_or_kernel_names.py
+++ b/python/paddle/fluid/tests/unittests/test_get_all_op_or_kernel_names.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from paddle.fluid import core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_get_device_properties.py b/python/paddle/fluid/tests/unittests/test_get_device_properties.py
index 3fea41dbadd67fa58cbd49f12741338e7b6ca700..aa3cac5d9f34aaa268dfb0795252c150b916efc4 100644
--- a/python/paddle/fluid/tests/unittests/test_get_device_properties.py
+++ b/python/paddle/fluid/tests/unittests/test_get_device_properties.py
@@ -13,8 +13,9 @@
 # limitations under the License.
 
 import unittest
-from paddle.fluid import core
+
 from paddle.device.cuda import device_count, get_device_properties
+from paddle.fluid import core
 
 
 class TestGetDeviceProperties(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_get_inputs_outputs_in_block.py b/python/paddle/fluid/tests/unittests/test_get_inputs_outputs_in_block.py
index 49c05c420cc12fa676266b4b4ed2e3a98eb272b2..c6a1c1a3482e928e95235fe9a16bcdbb1585312f 100644
--- a/python/paddle/fluid/tests/unittests/test_get_inputs_outputs_in_block.py
+++ b/python/paddle/fluid/tests/unittests/test_get_inputs_outputs_in_block.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
+
+import paddle
 from paddle.fluid.layers import utils
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_get_places_op.py b/python/paddle/fluid/tests/unittests/test_get_places_op.py
index d51e36f2514cd5718c23149fed8db4d365b09a13..03f32c78b59b50b78ba6953deeb65179129f67fa 100644
--- a/python/paddle/fluid/tests/unittests/test_get_places_op.py
+++ b/python/paddle/fluid/tests/unittests/test_get_places_op.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+from decorator_helper import prog_scope
+
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from paddle.fluid.layers.device import get_places
-from decorator_helper import prog_scope
-import unittest
 
 
 class TestGetPlaces(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_get_set_flags.py b/python/paddle/fluid/tests/unittests/test_get_set_flags.py
index dad58ae08ba96f9ba27ca19a18ee4266065b2ee1..aef5f2016f8af4830c6ffc1633d52fa5e162479b 100644
--- a/python/paddle/fluid/tests/unittests/test_get_set_flags.py
+++ b/python/paddle/fluid/tests/unittests/test_get_set_flags.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest as unittest
 
+import paddle.fluid as fluid
+
 
 class TestGetAndSetFlags(unittest.TestCase):
     def test_api(self):
diff --git a/python/paddle/fluid/tests/unittests/test_get_tensor_from_selected_rows_op.py b/python/paddle/fluid/tests/unittests/test_get_tensor_from_selected_rows_op.py
index 17bf702b88607348b77ad3e8ade20ffe0af547a1..ab5b9096dcc8ad1c3df4485e3c805abbb3a05eec 100644
--- a/python/paddle/fluid/tests/unittests/test_get_tensor_from_selected_rows_op.py
+++ b/python/paddle/fluid/tests/unittests/test_get_tensor_from_selected_rows_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid.core as core
+
 import numpy as np
+
 import paddle.fluid as fluid
-from paddle.fluid.op import Operator
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
+from paddle.fluid.op import Operator
 
 
 class TestGetTensorFromSelectedRowsError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_global_var_getter_setter.py b/python/paddle/fluid/tests/unittests/test_global_var_getter_setter.py
index 19c66daade99092e04911d7e377e23f16032e95e..d3f24dcb93ac4b2693db1bc4e6b428a12c406076 100644
--- a/python/paddle/fluid/tests/unittests/test_global_var_getter_setter.py
+++ b/python/paddle/fluid/tests/unittests/test_global_var_getter_setter.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
 import unittest as unittest
 
+import paddle.fluid as fluid
+
 
 class VarInfo:
     def __init__(self, var_name, var_type, writable):
diff --git a/python/paddle/fluid/tests/unittests/test_glu.py b/python/paddle/fluid/tests/unittests/test_glu.py
index 25f1975db0c5290ab538fa0204e38141d1077bbf..5ec54567ec1c8c2900bb1bde027416f1cbbf903b 100644
--- a/python/paddle/fluid/tests/unittests/test_glu.py
+++ b/python/paddle/fluid/tests/unittests/test_glu.py
@@ -12,12 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-from paddle import fluid
-import paddle.fluid.dygraph as dg
 import unittest
 
+import numpy as np
+
 import paddle
+import paddle.fluid.dygraph as dg
+from paddle import fluid
 from paddle.nn import functional as F
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_gpu_package_without_gpu_device.py b/python/paddle/fluid/tests/unittests/test_gpu_package_without_gpu_device.py
index ac786dea529f40d5829e673c838511678c48804f..6cf6eec52cdb372ea9ac9941da2634c5a4adcb85 100644
--- a/python/paddle/fluid/tests/unittests/test_gpu_package_without_gpu_device.py
+++ b/python/paddle/fluid/tests/unittests/test_gpu_package_without_gpu_device.py
@@ -13,10 +13,11 @@
 # limitations under the License.
 
 import os
-import sys
 import subprocess
-import unittest
+import sys
 import tempfile
+import unittest
+
 from paddle.fluid import core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_grad_clip_minimize.py b/python/paddle/fluid/tests/unittests/test_grad_clip_minimize.py
index ad1fc3ad1836980cec9d29900e8a0fea355935e9..db34123d3bdd8f3faf27f5a8ba51ddb881fcbe87 100644
--- a/python/paddle/fluid/tests/unittests/test_grad_clip_minimize.py
+++ b/python/paddle/fluid/tests/unittests/test_grad_clip_minimize.py
@@ -13,17 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle.fluid as fluid
-
-from paddle.fluid.dygraph.base import to_variable
-
 from paddle.fluid.clip import (
-    GradientClipByValue,
-    GradientClipByNorm,
     GradientClipByGlobalNorm,
+    GradientClipByNorm,
+    GradientClipByValue,
 )
+from paddle.fluid.dygraph.base import to_variable
 
 
 class TestGradClipByGlobalNorm(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_gradient_clip.py b/python/paddle/fluid/tests/unittests/test_gradient_clip.py
index d8eaaef49b215b2a8dd25743faf3950ca89c9f83..ec2812e4ff32b7441eb2e06c4067d499d5b60584 100644
--- a/python/paddle/fluid/tests/unittests/test_gradient_clip.py
+++ b/python/paddle/fluid/tests/unittests/test_gradient_clip.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from fake_reader import fake_imdb_reader
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-from fake_reader import fake_imdb_reader
+import paddle.fluid.core as core
 from paddle.fluid.clip import _allow_pure_fp16_global_norm_clip
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/test_graph_khop_sampler.py b/python/paddle/fluid/tests/unittests/test_graph_khop_sampler.py
index b2f57af35de90af2e27cad225218f56ef118816f..31ec4a9b03d9e972acb48979b0b6fd43b555c25a 100644
--- a/python/paddle/fluid/tests/unittests/test_graph_khop_sampler.py
+++ b/python/paddle/fluid/tests/unittests/test_graph_khop_sampler.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_graph_reindex.py b/python/paddle/fluid/tests/unittests/test_graph_reindex.py
index 318deda61f2a7be87a9eb7b373326f981bd7518c..db767504559d89fdbe52686bc1a494b08427b1ca 100644
--- a/python/paddle/fluid/tests/unittests/test_graph_reindex.py
+++ b/python/paddle/fluid/tests/unittests/test_graph_reindex.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_graph_sample_neighbors.py b/python/paddle/fluid/tests/unittests/test_graph_sample_neighbors.py
index 20366b80e2ad73ece80fa3a293fdd89947ca3d47..18c917fa1031e6ec8d21166c10b2a2bae93b978c 100644
--- a/python/paddle/fluid/tests/unittests/test_graph_sample_neighbors.py
+++ b/python/paddle/fluid/tests/unittests/test_graph_sample_neighbors.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_graph_send_recv_op.py b/python/paddle/fluid/tests/unittests/test_graph_send_recv_op.py
index a5344a96a319e72e4d2d827f9dc8c54f59db8490..c0a76eaa17b16efccf6b698bf2df0011bd8e4c0f 100644
--- a/python/paddle/fluid/tests/unittests/test_graph_send_recv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_graph_send_recv_op.py
@@ -15,11 +15,11 @@
 import unittest
 
 import numpy as np
+from op_test import OpTest
+
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 
-from op_test import OpTest
-
 
 def graph_send_recv_wrapper(
     x, src_index, dst_index, reduce_op="sum", out_size=None, name=None
diff --git a/python/paddle/fluid/tests/unittests/test_graph_send_ue_recv_op.py b/python/paddle/fluid/tests/unittests/test_graph_send_ue_recv_op.py
index 9d4d7dc25cab7fcd2730fb2cdffce90424d36842..e38c9ad109c1d5797920f1b7dfd11a832044d3ce 100644
--- a/python/paddle/fluid/tests/unittests/test_graph_send_ue_recv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_graph_send_ue_recv_op.py
@@ -14,13 +14,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
 from paddle.fluid.framework import _test_eager_guard
 
-from op_test import OpTest
-
 
 def get_broadcast_shape(shp1, shp2):
     pad_shp1, pad_shp2 = shp1, shp2
diff --git a/python/paddle/fluid/tests/unittests/test_graph_send_uv_op.py b/python/paddle/fluid/tests/unittests/test_graph_send_uv_op.py
index 9dd252b17c53197cbbbab4f46f8c13fbed05e436..64663398c38c800e7087f44148e620f2651972d8 100644
--- a/python/paddle/fluid/tests/unittests/test_graph_send_uv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_graph_send_uv_op.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 
-from op_test import OpTest
-
 
 def compute_graph_send_uv(inputs, attributes):
     x = inputs['x']
diff --git a/python/paddle/fluid/tests/unittests/test_grid_sample_function.py b/python/paddle/fluid/tests/unittests/test_grid_sample_function.py
index 323ddc80ed63d1456594fce36ff2b8179eb44892..3189fd6e11f7664ce50cb565ae252d2cf603c0ca 100644
--- a/python/paddle/fluid/tests/unittests/test_grid_sample_function.py
+++ b/python/paddle/fluid/tests/unittests/test_grid_sample_function.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle import fluid
 import paddle.fluid.dygraph as dg
 import paddle.nn.functional as F
-import unittest
+from paddle import fluid
 
 
 class GridSampleTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_grid_sampler_op.py b/python/paddle/fluid/tests/unittests/test_grid_sampler_op.py
index 0245383045b855c933dcab17a4384af3dfd80a7c..2b4f39c39aa141843711deb846ee9c4c9717ff84 100644
--- a/python/paddle/fluid/tests/unittests/test_grid_sampler_op.py
+++ b/python/paddle/fluid/tests/unittests/test_grid_sampler_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
 from op_test import OpTest, skip_check_grad_ci
 
+import paddle
+import paddle.fluid.core as core
+
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_group_norm_op_v2.py b/python/paddle/fluid/tests/unittests/test_group_norm_op_v2.py
index d457357996e1eef9cd50b03b6ce0d73c8e31c6b7..1082cd4b98dc58937fd5ac13b722346fe78bfa26 100644
--- a/python/paddle/fluid/tests/unittests/test_group_norm_op_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_group_norm_op_v2.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-import paddle.fluid as fluid
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
-import paddle
 
 
 def group_norm_naive_for_general_dimension(x, scale, bias, epsilon, groups):
diff --git a/python/paddle/fluid/tests/unittests/test_gru_op.py b/python/paddle/fluid/tests/unittests/test_gru_op.py
index ab3d9b516da1bb3a221917f884f65599dac183a5..2fbc60b45465a3a32ba2052786ce9b54c7f354d6 100644
--- a/python/paddle/fluid/tests/unittests/test_gru_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gru_op.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import functools
 import unittest
+
 import numpy as np
-import functools
 from op_test import OpTest
-from paddle.fluid.tests.unittests.test_lstm_op import ACTIVATION
+
 from paddle import fluid
 from paddle.fluid import Program, program_guard
+from paddle.fluid.tests.unittests.test_lstm_op import ACTIVATION
 
 
 def gru(
diff --git a/python/paddle/fluid/tests/unittests/test_gru_rnn_op.py b/python/paddle/fluid/tests/unittests/test_gru_rnn_op.py
index 89379ac87f3493ee75305ce504d04ec4735b95cb..9c60131b52a8d929c3b2e88c7a99cc4642a5d3df 100644
--- a/python/paddle/fluid/tests/unittests/test_gru_rnn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gru_rnn_op.py
@@ -12,18 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import random
+import sys
 import unittest
-import numpy as np
 
+import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
-import random
-import sys
 
 sys.path.append("./rnn")
-from rnn_numpy import GRU
 from convert import get_params_for_net
+from rnn_numpy import GRU
 
 random.seed(2)
 np.set_printoptions(threshold=np.inf)
diff --git a/python/paddle/fluid/tests/unittests/test_gru_unit_op.py b/python/paddle/fluid/tests/unittests/test_gru_unit_op.py
index 9d1fcc238ea2828550e82356587d9b251d6a2f36..2f7c4a42e3362dbef17f209e10dc176e1180b018 100644
--- a/python/paddle/fluid/tests/unittests/test_gru_unit_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gru_unit_op.py
@@ -14,12 +14,14 @@
 
 import math
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
 from op_test import OpTest
+
+import paddle.fluid as fluid
 from paddle import fluid
+from paddle.fluid.framework import Program, program_guard
 from paddle.fluid.layers import gru_unit
-from paddle.fluid.framework import program_guard, Program
 
 
 class TestGRUUnitAPIError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_gumbel_softmax_op.py b/python/paddle/fluid/tests/unittests/test_gumbel_softmax_op.py
index 3494ccb5d16c3112dadd86130182a99ef04cfa70..fa62013a75cda4b935143f33f66581d84de928a3 100644
--- a/python/paddle/fluid/tests/unittests/test_gumbel_softmax_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gumbel_softmax_op.py
@@ -11,8 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_hash_op.py b/python/paddle/fluid/tests/unittests/test_hash_op.py
index 0070a3fadc75ad78b45eec9f5517ccaeac822129..53b1551c7b8446273d332842a539b16ece3e8430 100644
--- a/python/paddle/fluid/tests/unittests/test_hash_op.py
+++ b/python/paddle/fluid/tests/unittests/test_hash_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_hinge_embedding_loss.py b/python/paddle/fluid/tests/unittests/test_hinge_embedding_loss.py
index 68e7b4210a6926aaa2b40ce8e22f35924f92679a..1ce6c1bc5f02539b3f0155802b68e9a0d820b0ca 100644
--- a/python/paddle/fluid/tests/unittests/test_hinge_embedding_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_hinge_embedding_loss.py
@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import numpy as np
 import unittest
+
+import numpy as np
+
+import paddle
 from paddle.static import Program, program_guard
 
 np.random.seed(42)
diff --git a/python/paddle/fluid/tests/unittests/test_hinge_loss_op.py b/python/paddle/fluid/tests/unittests/test_hinge_loss_op.py
index 1b320f864491ab4ea0d5c41c5b4da4b8786ffc36..d87d9e43aa2d37c8725a2db4a47501f67d159c1e 100644
--- a/python/paddle/fluid/tests/unittests/test_hinge_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_hinge_loss_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_histogram_op.py b/python/paddle/fluid/tests/unittests/test_histogram_op.py
index 669431f8f6ff4ba4fd4d29c7ad0c6e11e40f3cec..e9ebf10bc68753d7596af9e063128936ecfc4f93 100644
--- a/python/paddle/fluid/tests/unittests/test_histogram_op.py
+++ b/python/paddle/fluid/tests/unittests/test_histogram_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
-from op_test import OpTest
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_hsigmoid_op.py b/python/paddle/fluid/tests/unittests/test_hsigmoid_op.py
index 733ce0e6ce140abe97833dba61e29f3f26b56c04..180e9abe1b2f9b533501e1e7b321f5acb7b479a9 100644
--- a/python/paddle/fluid/tests/unittests/test_hsigmoid_op.py
+++ b/python/paddle/fluid/tests/unittests/test_hsigmoid_op.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import math
 import unittest
+
 import numpy as np
+from op_test import OpTest, skip_check_grad_ci
+
 import paddle
 import paddle.fluid as fluid
-import paddle.nn.functional as F
 import paddle.fluid.initializer as I
-import math
-from op_test import OpTest, skip_check_grad_ci
+import paddle.nn.functional as F
 
 paddle.enable_static()
 np.random.seed(100)
diff --git a/python/paddle/fluid/tests/unittests/test_huber_loss_op.py b/python/paddle/fluid/tests/unittests/test_huber_loss_op.py
index afb1170a9db4ec7a4e9010062018e367d8b967c4..a783e9f61930abbd926db26cc420fdc31fd14db0 100644
--- a/python/paddle/fluid/tests/unittests/test_huber_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_huber_loss_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_hybrid_parallel_topology.py b/python/paddle/fluid/tests/unittests/test_hybrid_parallel_topology.py
index d9210c128dc5c7fe85e62694bec0abeb699fadc6..33d7bca3f4dcb8ad03536193614007c0b1fd8904 100644
--- a/python/paddle/fluid/tests/unittests/test_hybrid_parallel_topology.py
+++ b/python/paddle/fluid/tests/unittests/test_hybrid_parallel_topology.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
-from paddle.distributed import fleet
+
 import numpy as np
 
+from paddle.distributed import fleet
+
 
 class TestCommunicateTopology(unittest.TestCase):
     def test_topology(self):
diff --git a/python/paddle/fluid/tests/unittests/test_identity_loss_op.py b/python/paddle/fluid/tests/unittests/test_identity_loss_op.py
index 0d808e7be3440d26771f7256f2090aa26af6888c..1a0ff98b176e55c214792f22ae679ee28b030335 100644
--- a/python/paddle/fluid/tests/unittests/test_identity_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_identity_loss_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
-from op_test import OpTest
 
 
 class TestIdentityLossOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_identity_op.py b/python/paddle/fluid/tests/unittests/test_identity_op.py
index f798b421cfb02a856feab5852a05e10c9f3725e6..311a609dd5146d14d27752cb9223abd2588f4b56 100644
--- a/python/paddle/fluid/tests/unittests/test_identity_op.py
+++ b/python/paddle/fluid/tests/unittests/test_identity_op.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_iinfo_and_finfo.py b/python/paddle/fluid/tests/unittests/test_iinfo_and_finfo.py
index bacb13a0981b7ad8ffd070140dc28fa0d48c1523..ba6a74779b279957d7cbbd36c9a308d3922a3972 100644
--- a/python/paddle/fluid/tests/unittests/test_iinfo_and_finfo.py
+++ b/python/paddle/fluid/tests/unittests/test_iinfo_and_finfo.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
 
+import paddle
+
 
 class TestIInfoAndFInfoAPI(unittest.TestCase):
     def test_invalid_input(self):
diff --git a/python/paddle/fluid/tests/unittests/test_im2sequence_op.py b/python/paddle/fluid/tests/unittests/test_im2sequence_op.py
index 24a5e696a10c880b177f8029509983c067bcbdc0..025701c6bff6ff1ab49ee352e93474564bfa02d9 100644
--- a/python/paddle/fluid/tests/unittests/test_im2sequence_op.py
+++ b/python/paddle/fluid/tests/unittests/test_im2sequence_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, skip_check_grad_ci
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_auto_prune.py b/python/paddle/fluid/tests/unittests/test_imperative_auto_prune.py
index 218ff0f0d77676306b9901b7171d43fc5664bb05..5889d8299dc38913e3b94e6dfab7b14521130571 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_auto_prune.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_auto_prune.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import numpy as np
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_basic.py b/python/paddle/fluid/tests/unittests/test_imperative_basic.py
index 25c7eed19b87da2f4f0cc29a2e3c865b8361c80b..595ec4fe3e60a0ec01fbb3b3892a7b402b2e9f3b 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_basic.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_basic.py
@@ -13,17 +13,17 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
 
+import paddle
 import paddle.fluid as fluid
-from paddle.fluid import core
-from paddle.fluid import Linear
-from paddle.fluid.layer_helper import LayerHelper
-from test_imperative_base import new_program_scope
 import paddle.fluid.dygraph_utils as dygraph_utils
+from paddle.fluid import Linear, core
 from paddle.fluid.dygraph.layer_object_helper import LayerObjectHelper
-import paddle
 from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
+from paddle.fluid.layer_helper import LayerHelper
 
 
 class MyLayer(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_container_layerdict.py b/python/paddle/fluid/tests/unittests/test_imperative_container_layerdict.py
index d81cef00f7bcae0b4a134ae7b2d3d9631b9173ab..0163ffcdaac5ef023ab3f17dc760452e82d8f776 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_container_layerdict.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_container_layerdict.py
@@ -13,8 +13,9 @@
 # limitations under the License.
 
 import unittest
-import paddle
 from collections import OrderedDict
+
+import paddle
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_container_layerlist.py b/python/paddle/fluid/tests/unittests/test_imperative_container_layerlist.py
index db86295a5aa9173b7bb208e41750854c71f8cb20..e90a16def8f5bc5951ea7731f3ac235bba01534f 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_container_layerlist.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_container_layerlist.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_container_parameterlist.py b/python/paddle/fluid/tests/unittests/test_imperative_container_parameterlist.py
index a87392741223b73bc3b18bcace36ea48601c5989..57335a88319e87150ce1fea69c3ebb118342bd5c 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_container_parameterlist.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_container_parameterlist.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
 from paddle import _legacy_C_ops
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_container_sequential.py b/python/paddle/fluid/tests/unittests/test_imperative_container_sequential.py
index c1b0a42675f6af7857ab3f4bdc519689adb7a595..7ed45d58703c22d747982d7da54dcd746acdf4f6 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_container_sequential.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_container_sequential.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+
 import numpy as np
+
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_base.py b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_base.py
index da15dcf29b570032b6c25f1decd0ef08b07c7a6d..5a8b8ca532cec79d7def26e2716d24e008bfbda2 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_base.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_base.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle.fluid as fluid
-from paddle.fluid.reader import use_pinned_memory
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.reader import use_pinned_memory
 
 
 def get_random_images_and_labels(image_shape, label_shape):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exception.py b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exception.py
index eac20ea03c788c88f3fccc441406f960abbfc9d2..d7f6240c872c1b79303034df8fbae8e2840f94ee 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exception.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exception.py
@@ -14,7 +14,9 @@
 
 import time
 import unittest
+
 import numpy as np
+
 import paddle.fluid as fluid
 from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exit_func.py b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exit_func.py
index ff9ae7343b38b632eeaee6804d87373cb4c44af0..6d250676871b866d583768ea550d7e9ef450de2d 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exit_func.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_exit_func.py
@@ -12,19 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import signal
-import unittest
 import multiprocessing
+import queue
+import signal
 import time
+import unittest
 
 from paddle.fluid.framework import _test_eager_guard
-
-import queue
-
 from paddle.fluid.reader import (
-    multiprocess_queue_set,
-    _cleanup,
     CleanupFuncRegistrar,
+    _cleanup,
+    multiprocess_queue_set,
 )
 
 # NOTE: These special functions cannot be detected by the existing coverage mechanism,
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_fds_clear.py b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_fds_clear.py
index 355f35ce5e9e62bf749019bb6f777bbd05efbbe5..2bff5c9e3384b26e1ca5a7cd4298476bd97eb29d 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_fds_clear.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_fds_clear.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle.fluid as fluid
-from paddle.io import Dataset, DataLoader
 from paddle.fluid.framework import _test_eager_guard
+from paddle.io import DataLoader, Dataset
 
 
 def get_random_images_and_labels(image_shape, label_shape):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_process.py b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_process.py
index c03b9b3bbf16b6c832a9dee695ada3dfb0a38bf0..5cbb84c2f2c8b49173f9509257445a33e0fe9dd2 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_data_loader_process.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_data_loader_process.py
@@ -12,14 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import multiprocessing
+import queue
+import unittest
+
 import numpy as np
+
 import paddle.fluid as fluid
-from paddle.fluid.reader import _reader_process_loop
 from paddle.fluid.framework import _test_eager_guard
-
-import queue
+from paddle.fluid.reader import _reader_process_loop
 
 
 def get_random_images_and_labels(image_shape, label_shape):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_data_parallel.py b/python/paddle/fluid/tests/unittests/test_imperative_data_parallel.py
index 97d74e342410f2f8e9a49728571e607be1f19f3f..b02b51050001636c9fa00fcd9309eca5022fa64f 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_data_parallel.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_data_parallel.py
@@ -13,13 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import unittest
 
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.fluid.dygraph as dygraph
 from paddle.fluid.dygraph.nn import Linear
-import paddle.fluid.core as core
 
 
 class MLP(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_decorator.py b/python/paddle/fluid/tests/unittests/test_imperative_decorator.py
index 42407c0b36f3fc2b3fe2af0f47ab1a6519813c3c..2f237a10c8d7002be9d000847a7579523d29d077 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_decorator.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_decorator.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
-import paddle.fluid.framework as framework
-import unittest
 import inspect
+import unittest
 
 from test_imperative_base import new_program_scope
+
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.framework as framework
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_deepcf.py b/python/paddle/fluid/tests/unittests/test_imperative_deepcf.py
index 0b8576994be1ca44da5fc2c2aa8cf4521b081c08..38c19677f79c1cc80571f194d2b393fc9162aa35 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_deepcf.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_deepcf.py
@@ -12,18 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
-import random
 import os
+import random
 import sys
+import unittest
+
+import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from test_imperative_base import new_program_scope
-from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.dygraph import Linear
+from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_double_grad.py b/python/paddle/fluid/tests/unittests/test_imperative_double_grad.py
index 4b5e008cb74828393befe82a513a70f077fbd316..ec879d9cf0178c43fa610a5820981af6e3e4b853 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_double_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_double_grad.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-import paddle
-from paddle.fluid.wrapped_decorator import wrap_decorator
-from paddle.vision.models import resnet50, resnet101
 import unittest
 from unittest import TestCase
+
 import numpy as np
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.wrapped_decorator import wrap_decorator
+from paddle.vision.models import resnet50, resnet101
 
 
 def _dygraph_guard_(func):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_framework.py b/python/paddle/fluid/tests/unittests/test_imperative_framework.py
index 44c5ee01fe52ec374a047e17573dbb76cd292571..fd86679a77a203f7af7f8850017920083d6b4097 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_framework.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_framework.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
-import paddle
-import paddle.fluid as fluid
+
 import numpy as np
 from test_imperative_base import new_program_scope
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_gan.py b/python/paddle/fluid/tests/unittests/test_imperative_gan.py
index d645dbe1f1e9360843618b852aad44be17ccb99e..781253449d58a8770a1e00cb924a1a578a5baf12 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_gan.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_gan.py
@@ -13,16 +13,17 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid import Linear
-from test_imperative_base import new_program_scope
 from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class Discriminator(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_gnn.py b/python/paddle/fluid/tests/unittests/test_imperative_gnn.py
index 58bf0b9ad48d476609d1589d3197ff22e1683059..bff393f38d1332bee6c258df6166702b55e14d93 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_gnn.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_gnn.py
@@ -12,17 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import sys
 import unittest
+
 import numpy as np
-import sys
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.optimizer import AdamOptimizer
-from test_imperative_base import new_program_scope
 from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import AdamOptimizer
 
 
 def gen_data():
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_group.py b/python/paddle/fluid/tests/unittests/test_imperative_group.py
index 672dee430f8896d32211d2ecc9f709553679cbc3..8b037ce722caa87cf659664efe90f7495950164a 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_group.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_group.py
@@ -12,14 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import unittest
 
 import paddle
 import paddle.fluid.core as core
 from paddle.fluid.framework import (
-    _test_eager_guard,
     _in_legacy_dygraph,
+    _test_eager_guard,
     in_dygraph_mode,
 )
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_hook_for_layer.py b/python/paddle/fluid/tests/unittests/test_imperative_hook_for_layer.py
index 462f614defaf278488e314e4637742d7113ef052..6521c5509483ba1e851d67b3285687a9104ef141 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_hook_for_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_hook_for_layer.py
@@ -13,13 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_lod_tensor_to_selected_rows import SimpleNet
 
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.dygraph.base as base
-
-from test_imperative_lod_tensor_to_selected_rows import SimpleNet
 from paddle.fluid.framework import _test_eager_guard
 
 call_forward_post_hook = False
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_layer_apply.py b/python/paddle/fluid/tests/unittests/test_imperative_layer_apply.py
index 156cac0b3a3243d42f13aab2e6fbaf34fbe38004..577569455233644af3b8f0602c229fcc6269cb85 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_layer_apply.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_layer_apply.py
@@ -14,11 +14,11 @@
 
 import unittest
 
+import numpy as np
+
 import paddle
-import paddle.nn as nn
 import paddle.fluid as fluid
-
-import numpy as np
+import paddle.nn as nn
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_layer_children.py b/python/paddle/fluid/tests/unittests/test_imperative_layer_children.py
index 80f3d4cc7ca78d0b8a267ca9b37353253973f199..59717d48949332a8e7e95e246f86511f51c55ca1 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_layer_children.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_layer_children.py
@@ -14,11 +14,11 @@
 
 import unittest
 
+import numpy as np
+
 import paddle
-import paddle.nn as nn
 import paddle.fluid as fluid
-
-import numpy as np
+import paddle.nn as nn
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_layer_trainable.py b/python/paddle/fluid/tests/unittests/test_imperative_layer_trainable.py
index dc4ad0cea15daea4edf1360481d9cea818cb8faf..abcb811f671a6c1f8a9bc5b0115402d6d3a3df72 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_layer_trainable.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_layer_trainable.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+
 import numpy as np
 
+import paddle.fluid as fluid
 import paddle.fluid.dygraph as dygraph
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_layers.py b/python/paddle/fluid/tests/unittests/test_imperative_layers.py
index e0cd3d4f88f64bc45917b4c244d4a3dcf3a5201e..821543a7577c3eb8b4cefde6b6a1759fc5b0c91a 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_layers.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_layers.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle.nn as nn
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_load_static_param.py b/python/paddle/fluid/tests/unittests/test_imperative_load_static_param.py
index 90e757a5d4eae13ddfed8c157fdea1b4ac07928c..b3e23565799b18629b15b0d9d37face00f004aa8 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_load_static_param.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_load_static_param.py
@@ -12,23 +12,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
+import tempfile
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.framework as framework
 from paddle.fluid.dygraph.nn import (
+    NCE,
     BatchNorm,
     Conv3D,
     Embedding,
     GroupNorm,
     LayerNorm,
     Linear,
-    NCE,
     PRelu,
 )
-import numpy as np
-import os
-import tempfile
 
 
 class TestDygraphLoadStatic(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_lod_tensor_to_selected_rows.py b/python/paddle/fluid/tests/unittests/test_imperative_lod_tensor_to_selected_rows.py
index d49552fcb9db88c95ee4798b64aa9d31e5d38aa9..f15205eb3f64dc80080f0a70d5f028874a60a3cc 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_lod_tensor_to_selected_rows.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_lod_tensor_to_selected_rows.py
@@ -13,16 +13,18 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+from test_imperative_base import new_program_scope
+from utils import DyGraphProgramDescTracerTestHelper
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.dygraph.nn import Embedding
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-import numpy as np
-from utils import DyGraphProgramDescTracerTestHelper
+from paddle.fluid.dygraph.nn import Embedding
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class SimpleNet(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_mnist.py b/python/paddle/fluid/tests/unittests/test_imperative_mnist.py
index 67ad27a1ba8d4517123d3e67d0317576725f5cf7..2ca175390d5516fd724f8c31bcf1bd3701543749 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_mnist.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_mnist.py
@@ -13,16 +13,17 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
+from utils import DyGraphProgramDescTracerTestHelper
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
+from paddle.fluid.dygraph.nn import Linear, Pool2D
+from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
 from paddle.fluid.optimizer import SGDOptimizer
-from paddle.fluid.dygraph.nn import Pool2D, Linear
-from test_imperative_base import new_program_scope
-from utils import DyGraphProgramDescTracerTestHelper
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
 
 
 class SimpleImgConvPool(fluid.dygraph.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_mnist_sorted_gradient.py b/python/paddle/fluid/tests/unittests/test_imperative_mnist_sorted_gradient.py
index 1a077311e0541b6689fdbaf1154dbe1debcc20fe..2ed75cb777a93e7359408f982dd23dcb329c4b0e 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_mnist_sorted_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_mnist_sorted_gradient.py
@@ -13,16 +13,17 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
+from test_imperative_mnist import MNIST
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-from test_imperative_mnist import MNIST
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class TestImperativeMnistSortGradient(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_named_members.py b/python/paddle/fluid/tests/unittests/test_imperative_named_members.py
index 044661940cb114efc6c8b87c4a824842cfbb1265..622839253d2ab25b419d7a005a52149a1346b613 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_named_members.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_named_members.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_numpy_bridge.py b/python/paddle/fluid/tests/unittests/test_imperative_numpy_bridge.py
index 4e333f7ca4e0ff6e8d0dfed6b406c8c476c4a743..15af13c2f57240abefbd5c0821892dcef02a67a8 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_numpy_bridge.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_numpy_bridge.py
@@ -16,6 +16,7 @@ import unittest
 import warnings
 
 import numpy as np
+
 import paddle.fluid as fluid
 from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_ocr_attention_model.py b/python/paddle/fluid/tests/unittests/test_imperative_ocr_attention_model.py
index 6205bb7f58b63043b680c2c2c35bd8813e76c15b..fcaafc72b8cce0c8f6af3a96405999fb5e9ead32 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_ocr_attention_model.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_ocr_attention_model.py
@@ -13,19 +13,21 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
+from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.dygraph.nn import (
-    Pool2D,
-    Linear,
     BatchNorm,
     Embedding,
     GRUUnit,
+    Linear,
+    Pool2D,
 )
-from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py b/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py
index 917876c9741a19cb47a4bde5db14bf72fabce286..521ff77d58f35810cf9c58af70d92a0c8f1a0408 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py
@@ -12,39 +12,37 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import itertools
 import unittest
+
 import numpy as np
-import itertools
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
+from paddle.distributed.fleet.meta_optimizers import DGCMomentumOptimizer
 from paddle.fluid import core
+from paddle.fluid.dygraph import Linear
+from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.optimizer import (
-    SGDOptimizer,
-    Adam,
-    MomentumOptimizer,
-    LarsMomentumOptimizer,
+    AdadeltaOptimizer,
     AdagradOptimizer,
+    Adam,
     AdamaxOptimizer,
-    DpsgdOptimizer,
     DecayedAdagradOptimizer,
-    AdadeltaOptimizer,
-    RMSPropOptimizer,
+    DpsgdOptimizer,
+    ExponentialMovingAverage,
     FtrlOptimizer,
     LambOptimizer,
-)
-from paddle.fluid.optimizer import (
+    LarsMomentumOptimizer,
+    LookaheadOptimizer,
     ModelAverage,
-    ExponentialMovingAverage,
+    MomentumOptimizer,
     PipelineOptimizer,
-    LookaheadOptimizer,
     RecomputeOptimizer,
+    RMSPropOptimizer,
+    SGDOptimizer,
 )
-from paddle.fluid.dygraph import Linear
-from test_imperative_base import new_program_scope
-from paddle.fluid.framework import _test_eager_guard
-
-from paddle.distributed.fleet.meta_optimizers import DGCMomentumOptimizer
 
 # Note(wangzhongpu)
 # In dygraph, don't support ModelAverage, DGCMomentumOptimizer, ExponentialMovingAverage, PipelineOptimizer, LookaheadOptimizer, RecomputeOptimizer.
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_optimizer_v2.py b/python/paddle/fluid/tests/unittests/test_imperative_optimizer_v2.py
index 0c6853ce653689dcb69f15c76285d7abece76c0a..8bc9a953aaf2976ee67503e4118f99da9c2f4a26 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_optimizer_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_optimizer_v2.py
@@ -12,36 +12,34 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import itertools
 import unittest
+
 import numpy as np
-import itertools
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
+from paddle.distributed.fleet.meta_optimizers import DGCMomentumOptimizer
 from paddle.fluid import core
+from paddle.fluid.dygraph import Linear
+from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.optimizer import (
-    MomentumOptimizer,
-    LarsMomentumOptimizer,
+    AdadeltaOptimizer,
     AdagradOptimizer,
     AdamaxOptimizer,
-    DpsgdOptimizer,
     DecayedAdagradOptimizer,
-    AdadeltaOptimizer,
-    RMSPropOptimizer,
+    DpsgdOptimizer,
+    ExponentialMovingAverage,
     FtrlOptimizer,
-)
-from paddle.fluid.optimizer import (
+    LarsMomentumOptimizer,
+    LookaheadOptimizer,
     ModelAverage,
-    ExponentialMovingAverage,
+    MomentumOptimizer,
     PipelineOptimizer,
-    LookaheadOptimizer,
     RecomputeOptimizer,
+    RMSPropOptimizer,
 )
-from paddle.fluid.dygraph import Linear
-from test_imperative_base import new_program_scope
-from paddle.fluid.framework import _test_eager_guard
-
-from paddle.distributed.fleet.meta_optimizers import DGCMomentumOptimizer
 
 # Note(wangzhongpu)
 # In dygraph, don't support ModelAverage, DGCMomentumOptimizer, ExponentialMovingAverage, PipelineOptimizer, LookaheadOptimizer, RecomputeOptimizer.
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_parallel_coalesce_split.py b/python/paddle/fluid/tests/unittests/test_imperative_parallel_coalesce_split.py
index aee8c08582c4c0dba1b1111e2c34c7fcd77fc7c3..721feaf188ea7c89e83c90c7d79fea11e951458a 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_parallel_coalesce_split.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_parallel_coalesce_split.py
@@ -13,18 +13,19 @@
 # limitations under the License.
 
 import unittest
-import numpy as np
 from collections import OrderedDict
 
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from paddle.fluid.dygraph.parallel import DataParallel
 from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.dygraph.parallel import (
+    DataParallel,
     _coalesce_tensors,
-    _split_tensors,
     _reshape_inplace,
+    _split_tensors,
 )
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_partitial_backward.py b/python/paddle/fluid/tests/unittests/test_imperative_partitial_backward.py
index 7f723a5d665d5c389ad525ca40bc954656e97d86..042fb294ff9fd103d07c968b5007791822f2edfb 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_partitial_backward.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_partitial_backward.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+
 import numpy as np
+
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn.py b/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn.py
index 2630e3ce689f53c7fd78d472fd00dcc31227cce5..3765a6676d0bbe1d47c231daf72a5dd8a070a028 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn.py
@@ -13,18 +13,20 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+from test_imperative_base import new_program_scope
+from utils import DyGraphProgramDescTracerTestHelper, is_equal_program
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.dygraph.nn import Embedding
 import paddle.fluid.framework as framework
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid.dygraph.base import to_variable
+from paddle.fluid.dygraph.nn import Embedding
+from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 from paddle.jit import TracedLayer
-from test_imperative_base import new_program_scope
-import numpy as np
-from utils import DyGraphProgramDescTracerTestHelper, is_equal_program
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
 
 
 class SimpleLSTMRNN(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn_sorted_gradient.py b/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn_sorted_gradient.py
index 38c8b9ca73dd464c0a845e346052f9a73e562325..fd43a5e917716009e81d441240a426a2f64ad54e 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn_sorted_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_ptb_rnn_sorted_gradient.py
@@ -13,16 +13,18 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+from test_imperative_base import new_program_scope
+from test_imperative_ptb_rnn import PtbModel
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.framework as framework
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-from test_imperative_ptb_rnn import PtbModel
-import numpy as np
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class TestDygraphPtbRnnSortGradient(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_recurrent_usage.py b/python/paddle/fluid/tests/unittests/test_imperative_recurrent_usage.py
index 3cafc512cba1ebed7fad4623fd402c1906e89266..26364bf1c9841066dd7b1353c8c09eb5e3008d1d 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_recurrent_usage.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_recurrent_usage.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
+
+import numpy as np
+from test_imperative_base import new_program_scope
+
 import paddle
+import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-import numpy as np
+from paddle.fluid.framework import _test_eager_guard
 
 
 class RecurrentTest(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_reinforcement.py b/python/paddle/fluid/tests/unittests/test_imperative_reinforcement.py
index 56b210f22d1eebc215f829b5f761761c99f981b8..0181c7a431c369fab5f2edc9be24a5303c46fba9 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_reinforcement.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_reinforcement.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import core
-from paddle.fluid.optimizer import SGDOptimizer
 import paddle.fluid.dygraph.nn as nn
-from test_imperative_base import new_program_scope
+from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class Policy(fluid.dygraph.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_resnet.py b/python/paddle/fluid/tests/unittests/test_imperative_resnet.py
index 18e8b8d1cc321d5c0d358115add22d4cf85e9b48..eca1e2d8cce26300d62e4a7f33e800d3f29cbed1 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_resnet.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_resnet.py
@@ -13,18 +13,18 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
+from utils import DyGraphProgramDescTracerTestHelper, is_equal_program
 
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import core
-from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid import Pool2D, BatchNorm, Linear
+from paddle.fluid import BatchNorm, Linear, Pool2D, core
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-from utils import DyGraphProgramDescTracerTestHelper, is_equal_program
+from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
+from paddle.fluid.layer_helper import LayerHelper
 from paddle.jit import TracedLayer
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
 
 # NOTE(zhiqiu): run with FLAGS_cudnn_deterministic=1
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_resnet_sorted_gradient.py b/python/paddle/fluid/tests/unittests/test_imperative_resnet_sorted_gradient.py
index 9e203092dc77b46a333f9b883d24dfdd8ee1db61..50afad1b5cf0eda65c5293f787b3c92eadf49a56 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_resnet_sorted_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_resnet_sorted_gradient.py
@@ -13,14 +13,15 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
+from test_imperative_resnet import ResNet
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-from test_imperative_resnet import ResNet
 from paddle.fluid.framework import _test_eager_guard
 
 batch_size = 8
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_save_load.py b/python/paddle/fluid/tests/unittests/test_imperative_save_load.py
index 82084cfd27ba5378f48cff337bee0bd9588eed4a..6f2645750f0d246ace0e9d87429bc25e1743b96f 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_save_load.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_save_load.py
@@ -14,15 +14,17 @@
 
 import os
 import unittest
+
+import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.dygraph.nn import Embedding
-from paddle.fluid.optimizer import Adam
 from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.dygraph.learning_rate_scheduler import LearningRateDecay
-import numpy as np
-import paddle
+from paddle.fluid.dygraph.nn import Embedding
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import Adam
 
 
 class SimpleLSTMRNN(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_save_load_v2.py b/python/paddle/fluid/tests/unittests/test_imperative_save_load_v2.py
index 2f81d59a60916d4e03c95d704b215171d8028ae4..65e389b359610123dcb851873f1c3a57d61408e8 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_save_load_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_save_load_v2.py
@@ -13,19 +13,19 @@
 # limitations under the License.
 
 import os
+import tempfile
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.dygraph.nn import Embedding
-from paddle.optimizer import Adam
 from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.dygraph.learning_rate_scheduler import LearningRateDecay
-import numpy as np
-import paddle
+from paddle.fluid.dygraph.nn import Embedding
 from paddle.fluid.framework import _test_eager_guard
-
-import tempfile
+from paddle.optimizer import Adam
 
 
 class SimpleLSTMRNN(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_se_resnext.py b/python/paddle/fluid/tests/unittests/test_imperative_se_resnext.py
index d977dadeeba84eb693de96563f6109d8aaff2d6f..1970c63bace0576eef28dbdfedaee72c01ebeb57 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_se_resnext.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_se_resnext.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.dygraph.nn import Pool2D, BatchNorm, Linear
-from test_imperative_base import new_program_scope
+from paddle.fluid.dygraph.nn import BatchNorm, Linear, Pool2D
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.layer_helper import LayerHelper
 
 if fluid.is_compiled_with_cuda():
     fluid.set_flags({'FLAGS_cudnn_deterministic': True})
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_selected_rows.py b/python/paddle/fluid/tests/unittests/test_imperative_selected_rows.py
index dc64e7d0574915c6a6e90bc63d3227b9da64ba33..72c77e753f54b6bcc1da74c1e8467a6ca5ce2f56 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_selected_rows.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_selected_rows.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
-from paddle.fluid.dygraph.base import to_variable
-from paddle.fluid.optimizer import SGDOptimizer
+
 import numpy as np
-import paddle.fluid.core as core
+
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
+from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class SimpleNet(paddle.nn.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_selected_rows_to_lod_tensor.py b/python/paddle/fluid/tests/unittests/test_imperative_selected_rows_to_lod_tensor.py
index 1f27b0190a6aeee8f0454d2e985a89fc0b55c20a..cc31e922b5efa2eb367c080ff19f9099f4534aed 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_selected_rows_to_lod_tensor.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_selected_rows_to_lod_tensor.py
@@ -13,16 +13,18 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+from test_imperative_base import new_program_scope
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.dygraph.nn import Embedding
 import paddle.fluid.framework as framework
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid.dygraph.base import to_variable
-from test_imperative_base import new_program_scope
-import numpy as np
+from paddle.fluid.dygraph.nn import Embedding
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.optimizer import SGDOptimizer
 
 
 class SimpleNet(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_signal_handler.py b/python/paddle/fluid/tests/unittests/test_imperative_signal_handler.py
index 488500cb3802a552333da64ae869b57c85dd0c40..f374d0b073c271d51309884787c072411c0c7766 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_signal_handler.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_signal_handler.py
@@ -12,12 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import multiprocessing
 import os
-import sys
 import signal
-import unittest
-import multiprocessing
+import sys
 import time
+import unittest
 
 from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_star_gan_with_gradient_penalty.py b/python/paddle/fluid/tests/unittests/test_imperative_star_gan_with_gradient_penalty.py
index f9034aa45f6f933cabe3a47ebacf34081c952660..9b52dc0a04731b4a45e40062bf3457f72ec12025 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_star_gan_with_gradient_penalty.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_star_gan_with_gradient_penalty.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-from paddle.tensor import random
-import numpy as np
-import unittest
 from paddle import _legacy_C_ops
 from paddle.fluid.framework import _test_eager_guard
+from paddle.tensor import random
 
 if fluid.is_compiled_with_cuda():
     fluid.core.globals()['FLAGS_cudnn_deterministic'] = True
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_static_runner_mnist.py b/python/paddle/fluid/tests/unittests/test_imperative_static_runner_mnist.py
index 825144cd16ade1927948dc5351c5e015e3703b75..d129a9270ab5d07c3d6e9a454477f110de020d11 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_static_runner_mnist.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_static_runner_mnist.py
@@ -15,11 +15,11 @@
 import unittest
 
 import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from test_imperative_base import new_program_scope
 
 LOADED_VAR_SUFFIX = ".load_0"
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_static_runner_while.py b/python/paddle/fluid/tests/unittests/test_imperative_static_runner_while.py
index d163350f136b7e4c9079a45b03fab296b46e464c..b0f6418e24c2c64cc157f43390b843f407f715e7 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_static_runner_while.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_static_runner_while.py
@@ -15,13 +15,12 @@
 import unittest
 
 import numpy as np
+from jit_load_rename_var import rename_var_with_generator
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import core
-from paddle.fluid import unique_name
-from test_imperative_base import new_program_scope
-from jit_load_rename_var import rename_var_with_generator
+from paddle.fluid import core, unique_name
 
 LOADED_VAR_SUFFIX = ".load_0"
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_tensor_clear_gradient.py b/python/paddle/fluid/tests/unittests/test_imperative_tensor_clear_gradient.py
index 0445e09232f2c27f2b593b58cddca2a445ee88a8..946e55c1e9ea330311e1b8ed3e4002ff5cf56233 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_tensor_clear_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_tensor_clear_gradient.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-import paddle
-from paddle.fluid.wrapped_decorator import wrap_decorator
 import unittest
 from unittest import TestCase
+
 import numpy as np
 
+import paddle
+import paddle.fluid as fluid
+from paddle.fluid.wrapped_decorator import wrap_decorator
+
 
 def _dygraph_guard_(func):
     def __impl__(*args, **kwargs):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_thread_local_has_grad.py b/python/paddle/fluid/tests/unittests/test_imperative_thread_local_has_grad.py
index 93a7469b55fdf69c19fb8eec04a5b202e249cbe2..8e7418b2f70754a10ec0133d7c61fd663b67f755 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_thread_local_has_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_thread_local_has_grad.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import threading
+import time
 import unittest
+
+import numpy as np
+
 import paddle
-import time
 import paddle.nn as nn
-import numpy as np
-import threading
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_trace_non_persistable_inputs.py b/python/paddle/fluid/tests/unittests/test_imperative_trace_non_persistable_inputs.py
index 43cad7ed996848f0fd85133d847124a7fb906ca5..72d987b0d4c5fdb0a8173de42e41faafa5f78e38 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_trace_non_persistable_inputs.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_trace_non_persistable_inputs.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
-import paddle.fluid as fluid
+
 import numpy as np
-import os
+
+import paddle.fluid as fluid
 
 
 class SimpleFCLayer(fluid.dygraph.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_transformer_sorted_gradient.py b/python/paddle/fluid/tests/unittests/test_imperative_transformer_sorted_gradient.py
index 8b34780ea7cc63f8f96d04aed9a46df6f47d9fc7..ccdf99f0f783dd685e240882a25268b67f5fae32 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_transformer_sorted_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_transformer_sorted_gradient.py
@@ -13,16 +13,17 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+from test_imperative_base import new_program_scope
+
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import Embedding, LayerNorm, Linear, Layer
-from paddle.fluid.dygraph import to_variable, guard
-from paddle.jit import TracedLayer
-from test_imperative_base import new_program_scope
-from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
-from paddle.fluid import core
-import numpy as np
 import paddle.nn.functional as F
+from paddle.fluid import Embedding, Layer, LayerNorm, Linear, core
+from paddle.fluid.dygraph import guard, to_variable
+from paddle.fluid.framework import _in_legacy_dygraph, _test_eager_guard
+from paddle.jit import TracedLayer
 
 np.set_printoptions(suppress=True)
 
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_triple_grad.py b/python/paddle/fluid/tests/unittests/test_imperative_triple_grad.py
index 231a3157104c81d8fe76f407b37988891cbb0bcd..175e42fb60017be4688e8c879136a6a44544beb7 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_triple_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_triple_grad.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-import paddle
-from paddle.fluid.wrapped_decorator import wrap_decorator
 import unittest
 from unittest import TestCase
+
 import numpy as np
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.wrapped_decorator import wrap_decorator
 
 
 def _dygraph_guard_(func):
diff --git a/python/paddle/fluid/tests/unittests/test_imperative_using_non_zero_gpu.py b/python/paddle/fluid/tests/unittests/test_imperative_using_non_zero_gpu.py
index 9d7ece633604d1e09503f78ca9469793e6923a15..f9b3abf1b07e1bdae887bec3ab89a038872999c9 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_using_non_zero_gpu.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_using_non_zero_gpu.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
 import unittest
-from paddle.fluid.dygraph import to_variable, guard
+
 import numpy as np
+
+import paddle
+import paddle.fluid as fluid
+from paddle.fluid.dygraph import guard, to_variable
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_increment.py b/python/paddle/fluid/tests/unittests/test_increment.py
index 4e435e55794e6a9dc3b19e704cda15d9bb8c94b5..18901aab4ccdafd4b8420da3179b169c3d33fcef 100755
--- a/python/paddle/fluid/tests/unittests/test_increment.py
+++ b/python/paddle/fluid/tests/unittests/test_increment.py
@@ -15,6 +15,7 @@
 import unittest
 
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_index_add_op.py b/python/paddle/fluid/tests/unittests/test_index_add_op.py
index c54479b3529683ef47fc8ed02e0f399d12261635..0e2e9dbd1a454437196d834ae6d645e744e37802 100644
--- a/python/paddle/fluid/tests/unittests/test_index_add_op.py
+++ b/python/paddle/fluid/tests/unittests/test_index_add_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
 from paddle.fluid import Program
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_index_sample_op.py b/python/paddle/fluid/tests/unittests/test_index_sample_op.py
index 550ddfe344f3eb7961ab72d80f585e2111aefdf0..84defacc099874a2713bb76fb4e0b148f5ac9521 100755
--- a/python/paddle/fluid/tests/unittests/test_index_sample_op.py
+++ b/python/paddle/fluid/tests/unittests/test_index_sample_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
-import paddle
-import paddle.fluid as fluid
+
 import numpy as np
 from op_test import OpTest
 
+import paddle
+import paddle.fluid as fluid
+
 
 class TestIndexSampleOp(OpTest):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_index_select_op.py b/python/paddle/fluid/tests/unittests/test_index_select_op.py
index edb2dc711822a5978d9d06e554d86c16e4d0ac24..39895f2691ca3f774b60323734d32d3ec4c88491 100644
--- a/python/paddle/fluid/tests/unittests/test_index_select_op.py
+++ b/python/paddle/fluid/tests/unittests/test_index_select_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_infer_no_need_buffer_slots.py b/python/paddle/fluid/tests/unittests/test_infer_no_need_buffer_slots.py
index 659aa36c334d3734fdf235eb69e372d4263c55f4..ed64e80e65872ef19777e2711419a0bbd0e2aabb 100644
--- a/python/paddle/fluid/tests/unittests/test_infer_no_need_buffer_slots.py
+++ b/python/paddle/fluid/tests/unittests/test_infer_no_need_buffer_slots.py
@@ -15,8 +15,8 @@
 import unittest
 
 import paddle.fluid as fluid
-import paddle.fluid.framework as framework
 import paddle.fluid.core as core
+import paddle.fluid.framework as framework
 
 
 class TestInferNoNeedBufferSlots(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_inference_api.py b/python/paddle/fluid/tests/unittests/test_inference_api.py
index e62b258fefefde7340e3e0bf4d026d20023d7bec..dff2c83623736d488c06ccbda18e649c60ccceae 100644
--- a/python/paddle/fluid/tests/unittests/test_inference_api.py
+++ b/python/paddle/fluid/tests/unittests/test_inference_api.py
@@ -13,15 +13,20 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 paddle.enable_static()
 import numpy as np
+
 import paddle.fluid as fluid
-from paddle.fluid.core import PaddleTensor
-from paddle.fluid.core import PaddleDType
-from paddle.inference import Config, create_predictor
-from paddle.inference import get_trt_compile_version, get_trt_runtime_version
+from paddle.fluid.core import PaddleDType, PaddleTensor
+from paddle.inference import (
+    Config,
+    create_predictor,
+    get_trt_compile_version,
+    get_trt_runtime_version,
+)
 
 
 class TestInferenceApi(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_inference_model_io.py b/python/paddle/fluid/tests/unittests/test_inference_model_io.py
index 1e98b7dbb258cccb658023b3ef497b7564f91512..b7aa6e7ba0ca5875e0c260bda3f2dd9ea89d67c0 100644
--- a/python/paddle/fluid/tests/unittests/test_inference_model_io.py
+++ b/python/paddle/fluid/tests/unittests/test_inference_model_io.py
@@ -12,25 +12,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-
-import os
 import importlib
+import os
 import tempfile
-import numpy as np
-import paddle.fluid.core as core
-import paddle.fluid as fluid
+import unittest
 import warnings
 
+import numpy as np
+
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.fluid.executor as executor
 import paddle.fluid.layers as layers
 import paddle.fluid.optimizer as optimizer
 from paddle.fluid.compiler import CompiledProgram
 from paddle.fluid.framework import Program, program_guard
 from paddle.fluid.io import (
-    save_inference_model,
     load_inference_model,
+    save_inference_model,
     save_persistables,
 )
 
diff --git a/python/paddle/fluid/tests/unittests/test_initializer.py b/python/paddle/fluid/tests/unittests/test_initializer.py
index 4454d7a9bb8d5dd77de14403a331c5d096fcaf85..11e871e26da438d12f52361c78b8888bafc22e53 100644
--- a/python/paddle/fluid/tests/unittests/test_initializer.py
+++ b/python/paddle/fluid/tests/unittests/test_initializer.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import math
 import unittest
 
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.framework as framework
diff --git a/python/paddle/fluid/tests/unittests/test_initializer_nn.py b/python/paddle/fluid/tests/unittests/test_initializer_nn.py
index c9b81720ba94b138d36adc99a4e634fd7efd9e2b..75dc9e224e0a84cf04535446481ee6149827000c 100644
--- a/python/paddle/fluid/tests/unittests/test_initializer_nn.py
+++ b/python/paddle/fluid/tests/unittests/test_initializer_nn.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
 
+import numpy as np
+
 import paddle
-import paddle.nn as nn
 import paddle.fluid as fluid
 import paddle.fluid.framework as framework
+import paddle.nn as nn
 import paddle.nn.initializer as initializer
 from paddle.fluid.core import VarDesc
 
diff --git a/python/paddle/fluid/tests/unittests/test_inner.py b/python/paddle/fluid/tests/unittests/test_inner.py
index 3e30e9fa2284b7af3757bd06f11c0ecee986468b..7fe097ba22b55c6e470324668a18867a99f6e96d 100644
--- a/python/paddle/fluid/tests/unittests/test_inner.py
+++ b/python/paddle/fluid/tests/unittests/test_inner.py
@@ -17,8 +17,8 @@ import unittest
 import numpy as np
 
 import paddle
-from paddle.static import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
+from paddle.static import Program, program_guard
 
 
 class TestMultiplyApi(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_inplace.py b/python/paddle/fluid/tests/unittests/test_inplace.py
index 2496ee37a05e4b43ffd37f66ada2216d5acc4dfe..8912cad2c3b9d2e58f7d7f112914efba081ff1b1 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_inplace_abn_op.py b/python/paddle/fluid/tests/unittests/test_inplace_abn_op.py
index 6aa644e3ac625490dca7402c5e7f36736ddd5fcb..fd9d7a26b1abc60129493754fa6cd64fbe120d25 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace_abn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace_abn_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import numpy as np
-import os
-import paddle.fluid.core as core
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 class TestInplaceANBOpTraining(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_inplace_addto_strategy.py b/python/paddle/fluid/tests/unittests/test_inplace_addto_strategy.py
index 252fdf68699b6c7a99aa236d50bf508680da3630..9f448e7f07a47b2ee438ee5e45228ee93668f3bd 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace_addto_strategy.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace_addto_strategy.py
@@ -14,9 +14,10 @@
 
 import unittest
 
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import numpy as np
 
 
 class ConvBNLayer(fluid.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_inplace_and_clear_gradient.py b/python/paddle/fluid/tests/unittests/test_inplace_and_clear_gradient.py
index aa7e837b6cd280513815629d37c28d9b8cbdd187..087be59cd32109a34e07d632bbc4524937c11915 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace_and_clear_gradient.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace_and_clear_gradient.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
 from paddle import _legacy_C_ops
-import unittest
 
 paddle.disable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_inplace_auto_generated_apis.py b/python/paddle/fluid/tests/unittests/test_inplace_auto_generated_apis.py
index d8f8b5dbc72ce1a98915a55e3db39fefa77ac6b5..bbf06f74c24d0f9971e04e1ece6f4ae127613633 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace_auto_generated_apis.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace_auto_generated_apis.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_inplace_softmax_with_cross_entropy.py b/python/paddle/fluid/tests/unittests/test_inplace_softmax_with_cross_entropy.py
index 8e9b154a41cce03eab7076d9d55414b6ee5bb9c0..fb6f04d48f04a630c923609f8067f560db08fc7e 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace_softmax_with_cross_entropy.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace_softmax_with_cross_entropy.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid as fluid
-import numpy as np
 import unittest
 
+import numpy as np
+
+import paddle.fluid as fluid
+
 
 class TestSoftmaxWithXe(unittest.TestCase):
     def setUp(self):
diff --git a/python/paddle/fluid/tests/unittests/test_input_spec.py b/python/paddle/fluid/tests/unittests/test_input_spec.py
index 88ffc212696454f715702a7738f72fb4e5cd26ba..3a623f463c1813d5c3b5d7d16270c62d44a8ec78 100644
--- a/python/paddle/fluid/tests/unittests/test_input_spec.py
+++ b/python/paddle/fluid/tests/unittests/test_input_spec.py
@@ -13,17 +13,18 @@
 # limitations under the License.
 
 import os
-import unittest
 import tempfile
+import unittest
+
 import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-from paddle.static import InputSpec
-from paddle.fluid.framework import convert_np_dtype_to_dtype_
 from paddle.fluid.dygraph.dygraph_to_static.utils import (
     _compatible_non_tensor_spec,
 )
+from paddle.fluid.framework import convert_np_dtype_to_dtype_
+from paddle.static import InputSpec
 
 
 class TestInputSpec(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_install_check.py b/python/paddle/fluid/tests/unittests/test_install_check.py
index 15f2b5f3b7eedbeef80aa03e3f3d72afc5e607da..4fe8cd6203852bb70a6d1969ef8234c85da8f9d4 100644
--- a/python/paddle/fluid/tests/unittests/test_install_check.py
+++ b/python/paddle/fluid/tests/unittests/test_install_check.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import unittest
+
 import paddle
-import os
 
 
 class TestInstallCheck(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_instance_norm_op.py b/python/paddle/fluid/tests/unittests/test_instance_norm_op.py
index c5cf210f340b0744a2ca77f091b82aa2603c6871..406fe75fc388d20a4239360ca2c0017003458b1d 100644
--- a/python/paddle/fluid/tests/unittests/test_instance_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_instance_norm_op.py
@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 from paddle.fluid.dygraph import to_variable
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_instance_norm_op_v2.py b/python/paddle/fluid/tests/unittests/test_instance_norm_op_v2.py
index 31719eecfa9dcaacc3a7b9769afb3bb4f7a9837f..705b93ba9c620bf3b5f52ab88ac0b3e44d3d3112 100644
--- a/python/paddle/fluid/tests/unittests/test_instance_norm_op_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_instance_norm_op_v2.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-import paddle.fluid as fluid
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
-import paddle
 
 
 class TestInstanceNorm(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_inverse_op.py b/python/paddle/fluid/tests/unittests/test_inverse_op.py
index f06d32170ba9b80e5d55918146869943ce8f3ef9..656b51bce3b9870e61ac4da5552f94490c4b23f1 100644
--- a/python/paddle/fluid/tests/unittests/test_inverse_op.py
+++ b/python/paddle/fluid/tests/unittests/test_inverse_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import paddle
-from op_test import OpTest
 
 
 class TestInverseOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_io_save_load.py b/python/paddle/fluid/tests/unittests/test_io_save_load.py
index 80c2ae1f92ff565796e1881528c8a7aa48782b21..c24e48d740781140eeb70c0e984f77c8f8a5ebad 100644
--- a/python/paddle/fluid/tests/unittests/test_io_save_load.py
+++ b/python/paddle/fluid/tests/unittests/test_io_save_load.py
@@ -12,13 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
+import tempfile
 import unittest
+
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
-import tempfile
-import os
 
 
 class TestSaveLoadAPIError(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_iou_similarity_op.py b/python/paddle/fluid/tests/unittests/test_iou_similarity_op.py
index 3d131339794832755f462cc6f357327ee10c5723..614766b6609ba10f7b9cbdfa47685dd8e909ab0d 100644
--- a/python/paddle/fluid/tests/unittests/test_iou_similarity_op.py
+++ b/python/paddle/fluid/tests/unittests/test_iou_similarity_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy.random as random
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_ir_graph.py b/python/paddle/fluid/tests/unittests/test_ir_graph.py
index a8effa96920a841a5a0662acc10af10ab4107d8f..0aabb05be7d4494a03fa247b6ce66880659cda39 100644
--- a/python/paddle/fluid/tests/unittests/test_ir_graph.py
+++ b/python/paddle/fluid/tests/unittests/test_ir_graph.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 from paddle import fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_ir_inplace_pass.py b/python/paddle/fluid/tests/unittests/test_ir_inplace_pass.py
index 62ea08307ce1572c77f1a9d3930daf068926cb86..b7a0ab0d450426949ca39671f36500ff9a06533a 100644
--- a/python/paddle/fluid/tests/unittests/test_ir_inplace_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_ir_inplace_pass.py
@@ -14,11 +14,13 @@
 
 import os
 import unittest
+
 import numpy as np
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
+import paddle.fluid.core as core
 
 
 def fc_with_batchnorm(use_feed):
diff --git a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_ifelse_op.py b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_ifelse_op.py
index 657c267767dfa49deefd382a49eb7fef9ea3204a..595dd02e432bdadea07faa016cb2a01eeed83557 100644
--- a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_ifelse_op.py
+++ b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_ifelse_op.py
@@ -14,16 +14,15 @@
 
 # nlp model stack of op operate on lod. It's a classical test case in optimize pass.
 
+import unittest
+
 import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
-
-import unittest
 import paddle.fluid.core as core
-
-from paddle.fluid import compiler, Program, program_guard
+import paddle.fluid.layers as layers
+from paddle.fluid import Program, compiler, program_guard
 from paddle.fluid.executor import Executor
 from paddle.fluid.optimizer import MomentumOptimizer
 
diff --git a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_nlp.py b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_nlp.py
index 85f78d9aef4a1b08b562a9422d27750cfe012e2d..53d01d9df693356e13c66b0a08add1eed0f00f10 100644
--- a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_nlp.py
+++ b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_nlp.py
@@ -14,11 +14,13 @@
 
 # nlp model stack of op operate on lod. It's a classical test case in optimize pass.
 
-import paddle
-import paddle.fluid as fluid
 import unittest
+
 from ir_memory_optimize_net_base import TestIrMemOptBase
 
+import paddle
+import paddle.fluid as fluid
+
 
 def lstm_net(
     data,
diff --git a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_pass.py b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_pass.py
index a15079021ed561d87de43df9ee6f473d5f602a81..6cf56915832d9904e2f6450dc8a4176923738375 100644
--- a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_pass.py
+++ b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_pass.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
-import paddle.fluid as fluid
-import paddle.fluid.core as core
+import unittest
+
 import numpy as np
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
+
 import paddle
-import unittest
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 
 
 def _feed_data_helper():
diff --git a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_transformer.py b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_transformer.py
index 8d1191fddd5b3e545dda1064bba180d6049c877f..175cab191e6a7740dfe007d8f0cef042ead902a3 100644
--- a/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_transformer.py
+++ b/python/paddle/fluid/tests/unittests/test_ir_memory_optimize_transformer.py
@@ -14,11 +14,12 @@
 
 import os
 import unittest
+
 import paddle.fluid.core as core
 
 os.environ['FLAGS_eager_delete_tensor_gb'] = "0.0"
 
-from parallel_executor_test_base import TestParallelExecutorBase, DeviceType
+from parallel_executor_test_base import DeviceType, TestParallelExecutorBase
 from test_parallel_executor_transformer import get_feed_data_reader, transformer
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_is_complex.py b/python/paddle/fluid/tests/unittests/test_is_complex.py
index fd2e58eff6399bed62ebf73538b11ce7ab91b515..f65546da552f05ce558ba1cc05001a68d86f0ea9 100644
--- a/python/paddle/fluid/tests/unittests/test_is_complex.py
+++ b/python/paddle/fluid/tests/unittests/test_is_complex.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import numpy as np
 import unittest
 
+import numpy as np
+
+import paddle
+
 
 class TestIsComplex(unittest.TestCase):
     def test_for_integer(self):
diff --git a/python/paddle/fluid/tests/unittests/test_is_empty_op.py b/python/paddle/fluid/tests/unittests/test_is_empty_op.py
index d6235f7abc4bb915af3fc6a5b775e9994e7e45d3..6cf410eaede84700d983b46751f5d15015e5791b 100644
--- a/python/paddle/fluid/tests/unittests/test_is_empty_op.py
+++ b/python/paddle/fluid/tests/unittests/test_is_empty_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_is_integer.py b/python/paddle/fluid/tests/unittests/test_is_integer.py
index 9e0eae91292966069f01963e522378abd69ef912..2ef57ca1a7aefa50325b5f1e45f3e67f0e2d8438 100644
--- a/python/paddle/fluid/tests/unittests/test_is_integer.py
+++ b/python/paddle/fluid/tests/unittests/test_is_integer.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import numpy as np
 import unittest
 
+import numpy as np
+
+import paddle
+
 
 class TestIsInteger(unittest.TestCase):
     def test_for_integer(self):
diff --git a/python/paddle/fluid/tests/unittests/test_is_tensor.py b/python/paddle/fluid/tests/unittests/test_is_tensor.py
index b91b5aaf3e70227ac9ab0ad4f5ad9fcd4dc687e5..3ba3013fac10975d224d4d6159ab7120f366c494 100644
--- a/python/paddle/fluid/tests/unittests/test_is_tensor.py
+++ b/python/paddle/fluid/tests/unittests/test_is_tensor.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import paddle
 
 DELTA = 0.00001
diff --git a/python/paddle/fluid/tests/unittests/test_isclose_op.py b/python/paddle/fluid/tests/unittests/test_isclose_op.py
index 5d53c337ce18cefa1ac795cb0539bd2bd404372f..fc2a5cd5ebef2d54bffc4fcd980caa9f1a9e9392 100644
--- a/python/paddle/fluid/tests/unittests/test_isclose_op.py
+++ b/python/paddle/fluid/tests/unittests/test_isclose_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_isfinite_op.py b/python/paddle/fluid/tests/unittests/test_isfinite_op.py
index cbe12d1cb3f4babb32e13fab0c55273f8efd44bc..24f6ab3dea2e2a6b1039a796a1b9c79286966e80 100644
--- a/python/paddle/fluid/tests/unittests/test_isfinite_op.py
+++ b/python/paddle/fluid/tests/unittests/test_isfinite_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from op_test import OpTest
 
 
 class TestInf(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_isfinite_v2_op.py b/python/paddle/fluid/tests/unittests/test_isfinite_v2_op.py
index e3d094890ac7c6206bf20cb98a3e988ba4d3c550..ef9da3608631391275195a080ec25bd2de44beac 100644
--- a/python/paddle/fluid/tests/unittests/test_isfinite_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_isfinite_v2_op.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
-import paddle.fluid as fluid
 import unittest
+
 import numpy as np
+
+import paddle
+import paddle.fluid as fluid
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_jit_layer.py b/python/paddle/fluid/tests/unittests/test_jit_layer.py
index e6718fafeab92b08cd23498d89800210cf5aa700..c670ac00aed6c382e2eb94ba744ce291f5b78680 100644
--- a/python/paddle/fluid/tests/unittests/test_jit_layer.py
+++ b/python/paddle/fluid/tests/unittests/test_jit_layer.py
@@ -13,16 +13,16 @@
 # limitations under the License.
 
 import os
-import paddle
-import unittest
 import tempfile
+import unittest
+
 import numpy as np
-from paddle.static import InputSpec
+
+import paddle
 from paddle.fluid.framework import _dygraph_place_guard
+from paddle.jit.dy2static.program_translator import ProgramTranslator
 from paddle.jit.layer import Layer
-from paddle.jit.dy2static.program_translator import (
-    ProgramTranslator,
-)
+from paddle.static import InputSpec
 
 paddle.seed(1)
 
diff --git a/python/paddle/fluid/tests/unittests/test_jit_pre_save_hooks.py b/python/paddle/fluid/tests/unittests/test_jit_pre_save_hooks.py
index 69203733c2cb2466821f092be77a9b1980add471..795c7f9b43c7a9fd3766190dfc5eb1d27d2ebecb 100644
--- a/python/paddle/fluid/tests/unittests/test_jit_pre_save_hooks.py
+++ b/python/paddle/fluid/tests/unittests/test_jit_pre_save_hooks.py
@@ -17,9 +17,9 @@ import unittest
 
 import paddle
 from paddle.jit.api import (
-    _run_save_pre_hooks,
     _clear_save_pre_hooks,
     _register_save_pre_hook,
+    _run_save_pre_hooks,
 )
 
 _counter = 0
diff --git a/python/paddle/fluid/tests/unittests/test_jit_save_load.py b/python/paddle/fluid/tests/unittests/test_jit_save_load.py
index 7632c958464a4fe683ad0ce28c4019e681029bd8..faf6a61df3f3902aba572f1098fbc6b4b8d92148 100644
--- a/python/paddle/fluid/tests/unittests/test_jit_save_load.py
+++ b/python/paddle/fluid/tests/unittests/test_jit_save_load.py
@@ -16,17 +16,19 @@
 import os
 import pickle
 import shutil
-import unittest
 import tempfile
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle.static import InputSpec
 import paddle.fluid as fluid
-from paddle.fluid.layers.utils import flatten
+from paddle.fluid import unique_name
 from paddle.fluid.dygraph import Linear
-from paddle.jit.api import declarative
 from paddle.fluid.dygraph.io import INFER_PARAMS_INFO_SUFFIX
-from paddle.fluid import unique_name
+from paddle.fluid.layers.utils import flatten
+from paddle.jit.api import declarative
+from paddle.static import InputSpec
 
 BATCH_SIZE = 32
 BATCH_NUM = 10
diff --git a/python/paddle/fluid/tests/unittests/test_kldiv_loss_op.py b/python/paddle/fluid/tests/unittests/test_kldiv_loss_op.py
index 9fd0868f1e4c77c5fd30420198df67b66af39c30..5d6e3af092accb25697043ec0f8e6ccacb44e4ab 100644
--- a/python/paddle/fluid/tests/unittests/test_kldiv_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_kldiv_loss_op.py
@@ -11,10 +11,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
+import paddle
 from paddle.nn.functional import kl_div
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_kron_op.py b/python/paddle/fluid/tests/unittests/test_kron_op.py
index a2f1657a06e6608eea4d2ddde3f36b0262f4fa9c..ae9ce0525d553c16a07c430a8cbcc64473e2448f 100644
--- a/python/paddle/fluid/tests/unittests/test_kron_op.py
+++ b/python/paddle/fluid/tests/unittests/test_kron_op.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_kthvalue_op.py b/python/paddle/fluid/tests/unittests/test_kthvalue_op.py
index f3f5ccf18797d90ccc813b4204c541d74efc062d..276e3f4b8aa9bc04370a0f2c317466a2ba55b23f 100644
--- a/python/paddle/fluid/tests/unittests/test_kthvalue_op.py
+++ b/python/paddle/fluid/tests/unittests/test_kthvalue_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/test_l1_loss.py b/python/paddle/fluid/tests/unittests/test_l1_loss.py
index 00b716ce8715481cf7bd41870ec0a0336ecde8ce..f1bce0d1b6a92caf3e14d38106ea8ba02d55ebaf 100644
--- a/python/paddle/fluid/tests/unittests/test_l1_loss.py
+++ b/python/paddle/fluid/tests/unittests/test_l1_loss.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
-import numpy as np
-import unittest
 
 
 class TestFunctionalL1Loss(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_l1_norm_op.py b/python/paddle/fluid/tests/unittests/test_l1_norm_op.py
index 03d69e2334750224a54de7cfedd8cb799b47e117..7ca647da0a3b7864331c910bc1a7f4b9f06efad9 100644
--- a/python/paddle/fluid/tests/unittests/test_l1_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_l1_norm_op.py
@@ -12,8 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import unittest
+
+import numpy as np
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py b/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py
index 7f6e6d8434d18ae648ad72f267ad6d7a9c260ce8..3c97be9c42b85e9e8ef85876a38e2e2bbef5e096 100644
--- a/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py
+++ b/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
 import numpy as np
+
 import paddle
-from paddle import fluid
 import paddle.fluid.dygraph as dg
 import paddle.nn.functional as F
-import unittest
+from paddle import fluid
 
 
 class LabelSmoothTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_label_smooth_op.py b/python/paddle/fluid/tests/unittests/test_label_smooth_op.py
index e8c4fbc43d32a5e3ce83e870659e6e29a90e02d8..b62a75438a7fd4569b85c39673a08a92fbfaf194 100644
--- a/python/paddle/fluid/tests/unittests/test_label_smooth_op.py
+++ b/python/paddle/fluid/tests/unittests/test_label_smooth_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lamb_op.py b/python/paddle/fluid/tests/unittests/test_lamb_op.py
index 9c3bbe6d830bc0e5e8d9b193e5289500227e04d4..ba3a865d31c0194bd2afe5b93fe82b12ba054119 100644
--- a/python/paddle/fluid/tests/unittests/test_lamb_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lamb_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 from paddle.fluid import core
 from paddle.fluid.op import Operator
diff --git a/python/paddle/fluid/tests/unittests/test_lambv2_op.py b/python/paddle/fluid/tests/unittests/test_lambv2_op.py
index bb2aee8873984e1024ade30099ec0ef5b275d5f1..6b513008109ec6a4315388ddd4c53b3f6fa7b5dc 100644
--- a/python/paddle/fluid/tests/unittests/test_lambv2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lambv2_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from paddle.fluid import core
-from paddle.fluid.dygraph.base import switch_to_static_graph
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
+from paddle.fluid import core
+from paddle.fluid.dygraph.base import switch_to_static_graph
 
 
 class LAMBOptimizer(paddle.optimizer.Lamb):
diff --git a/python/paddle/fluid/tests/unittests/test_launch_coverage.py b/python/paddle/fluid/tests/unittests/test_launch_coverage.py
index 1f00ea9af55639db585d568a3b0d0e35b9bcbff1..006915662876ee8fdb83bc437a47df3b09b7e3af 100644
--- a/python/paddle/fluid/tests/unittests/test_launch_coverage.py
+++ b/python/paddle/fluid/tests/unittests/test_launch_coverage.py
@@ -13,14 +13,14 @@
 # limitations under the License.
 
 import unittest
+from argparse import REMAINDER, ArgumentParser
 
-from argparse import ArgumentParser, REMAINDER
+from paddle.distributed.fleet.launch_utils import find_free_ports
 from paddle.distributed.utils.launch_utils import (
     _print_arguments,
-    get_gpus,
     get_cluster_from_args,
+    get_gpus,
 )
-from paddle.distributed.fleet.launch_utils import find_free_ports
 
 
 def _parse_args():
diff --git a/python/paddle/fluid/tests/unittests/test_layer_norm_op.py b/python/paddle/fluid/tests/unittests/test_layer_norm_op.py
index 502f4ec5bb9775e61a100d640cc845703f6d36d9..200372d2d143f6c8feed9e155d87fa64b104adb0 100644
--- a/python/paddle/fluid/tests/unittests/test_layer_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_layer_norm_op.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import unittest
+from functools import reduce
+from operator import mul
+
 import numpy as np
-import paddle
+from op_test import _set_use_system_allocator
 
-from operator import mul
-import paddle.fluid.core as core
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.nn.functional as F
-from functools import reduce
-from op_test import _set_use_system_allocator
 from paddle.fluid import Program, program_guard
 from paddle.fluid.contrib.mixed_precision.fp16_utils import (
     _keep_layer_norm_scale_bias_to_fp32,
diff --git a/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py b/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py
index 6e9e4931465434a3a354098e6730e09392422a25..8b258c75661655d1589b39d975e990a54642beb9 100644
--- a/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py
@@ -13,13 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
-import paddle.fluid as fluid
-from paddle.fluid.framework import _test_eager_guard
+
+import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
-import paddle
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestDygraphLayerNormv2(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_layers.py b/python/paddle/fluid/tests/unittests/test_layers.py
index c5cf9253f755fee0acbd9d102b3b382d18e93c92..f3f5598f52c7330ceb511ad546fc451c7e317654 100644
--- a/python/paddle/fluid/tests/unittests/test_layers.py
+++ b/python/paddle/fluid/tests/unittests/test_layers.py
@@ -12,29 +12,31 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import contextlib
+import inspect
 import unittest
 
-import contextlib
 import numpy as np
 from decorator_helper import prog_scope
-import inspect
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid.layers.device import get_places
+import paddle.fluid.layers as layers
 import paddle.fluid.nets as nets
-from paddle.fluid.framework import Program, program_guard, default_main_program
-from paddle.fluid.param_attr import ParamAttr
+import paddle.nn.functional as F
 from paddle.fluid import core
+from paddle.fluid.dygraph import base, nn, to_variable
+from paddle.fluid.framework import (
+    Program,
+    _test_eager_guard,
+    default_main_program,
+    program_guard,
+)
 from paddle.fluid.initializer import Constant
-import paddle.fluid.layers as layers
-from test_imperative_base import new_program_scope
-from paddle.fluid.dygraph import nn
-from paddle.fluid.dygraph import base
-from paddle.fluid.dygraph import to_variable
-from paddle.fluid.framework import _test_eager_guard
+from paddle.fluid.layers.device import get_places
+from paddle.fluid.param_attr import ParamAttr
 from paddle.tensor import random
-import paddle.nn.functional as F
 
 
 class LayerTest(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_layout_autotune.py b/python/paddle/fluid/tests/unittests/test_layout_autotune.py
index 259fe01601e968511090fac6353b759fdbff8a9b..70c283a549a09bb6c0466928a1cdaa9ce8bbc0ba 100644
--- a/python/paddle/fluid/tests/unittests/test_layout_autotune.py
+++ b/python/paddle/fluid/tests/unittests/test_layout_autotune.py
@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import json
+import os
 import tempfile
 import unittest
 import warnings
diff --git a/python/paddle/fluid/tests/unittests/test_lazy_init.py b/python/paddle/fluid/tests/unittests/test_lazy_init.py
index e8148e542b1802dd614aeba2fa6c25fb8b3e7d9c..8b2bef91c00e8e3151fcea995e752e038d91e613 100644
--- a/python/paddle/fluid/tests/unittests/test_lazy_init.py
+++ b/python/paddle/fluid/tests/unittests/test_lazy_init.py
@@ -12,11 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
+
+import paddle
 from paddle import LazyGuard
-from paddle.nn import Linear, Layer
+from paddle.fluid import unique_name
+from paddle.nn import Layer, Linear
 from paddle.nn.initializer import (
     Constant,
     Normal,
@@ -25,7 +28,6 @@ from paddle.nn.initializer import (
     XavierNormal,
     XavierUniform,
 )
-from paddle.fluid import unique_name
 
 
 class TestInitializerBase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_lbfgs.py b/python/paddle/fluid/tests/unittests/test_lbfgs.py
index 21d96d17c2ad9fbcecf0399c224403fff82ae559..a13aeadb08466441ca97e9464e12c696de5cbd3b 100644
--- a/python/paddle/fluid/tests/unittests/test_lbfgs.py
+++ b/python/paddle/fluid/tests/unittests/test_lbfgs.py
@@ -18,7 +18,6 @@ import numpy as np
 
 import paddle
 import paddle.nn.functional as F
-
 from paddle.incubate.optimizer.functional.lbfgs import minimize_lbfgs
 
 np.random.seed(123)
diff --git a/python/paddle/fluid/tests/unittests/test_lcm.py b/python/paddle/fluid/tests/unittests/test_lcm.py
index 83f3f82d7e7a204dff7e45e592253153aefc0bfb..0e110468d6a966e5d9ed0c69909426f5e109ba03 100644
--- a/python/paddle/fluid/tests/unittests/test_lcm.py
+++ b/python/paddle/fluid/tests/unittests/test_lcm.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_lerp_op.py b/python/paddle/fluid/tests/unittests/test_lerp_op.py
index 1cae3fbaba9ac9a2015a42dcfd92a3a8f28cb09b..625d5b1b13dfe774985ac7e6993ba7c5912af089 100644
--- a/python/paddle/fluid/tests/unittests/test_lerp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lerp_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid.core as core
 
diff --git a/python/paddle/fluid/tests/unittests/test_lgamma_op.py b/python/paddle/fluid/tests/unittests/test_lgamma_op.py
index 3b88e7fda57c9c22f9454264508ae64a0d0b8943..43d0b139acd1d0f0f01e057fbfafd7d6351f77e1 100644
--- a/python/paddle/fluid/tests/unittests/test_lgamma_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lgamma_op.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import math
+import unittest
+
 import numpy as np
-import paddle
 from op_test import OpTest
 from scipy import special
 
+import paddle
+
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_limit_by_capacity_op.py b/python/paddle/fluid/tests/unittests/test_limit_by_capacity_op.py
index 02c71ea3a4147d75f4fc101125ab8bd1dc09ec18..597ffcf79714b4385b560dd9983ecc8a04497ea9 100644
--- a/python/paddle/fluid/tests/unittests/test_limit_by_capacity_op.py
+++ b/python/paddle/fluid/tests/unittests/test_limit_by_capacity_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
-import paddle
+
 import numpy as np
+
+import paddle
 from paddle.distributed.models.moe import utils
 from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_linalg_cond.py b/python/paddle/fluid/tests/unittests/test_linalg_cond.py
index 4724bbc6d080203847d0eb3ef3521defeb16fd49..61ad09cbfe400b78a43fea44dc3c4d62b3f4238b 100644
--- a/python/paddle/fluid/tests/unittests/test_linalg_cond.py
+++ b/python/paddle/fluid/tests/unittests/test_linalg_cond.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.static as static
 from paddle.fluid.framework import _test_eager_guard
diff --git a/python/paddle/fluid/tests/unittests/test_linalg_lstsq_op.py b/python/paddle/fluid/tests/unittests/test_linalg_lstsq_op.py
index f627057ed242da74a37be1e526b3a9ade6eb0652..b82fb8ed09a0a53adb07492e2f2bb12187c978cf 100644
--- a/python/paddle/fluid/tests/unittests/test_linalg_lstsq_op.py
+++ b/python/paddle/fluid/tests/unittests/test_linalg_lstsq_op.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py b/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py
index 8c39cbb7c9517fdb6997240d3d81ce3c3fa693f7..353b4d8da55e9c06122ab219ed2710bca0f87771 100644
--- a/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py
@@ -13,7 +13,9 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_linear.py b/python/paddle/fluid/tests/unittests/test_linear.py
index 0cec046354294cd5f846670c3d7ede07a23ed879..71f5c831ae4b6ddb8b87296ca6b8df1e96fdcef3 100644
--- a/python/paddle/fluid/tests/unittests/test_linear.py
+++ b/python/paddle/fluid/tests/unittests/test_linear.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
+
 import paddle
-from paddle import fluid
+import paddle.fluid.core as core
 import paddle.nn.functional as F
+from paddle import fluid
 
 
 class LinearTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_linear_chain_crf_op.py b/python/paddle/fluid/tests/unittests/test_linear_chain_crf_op.py
index d352275c263f8c6ccdaec7dce31190b7424df442..6899a340633787754673c611b7f69507bbdaaaff 100755
--- a/python/paddle/fluid/tests/unittests/test_linear_chain_crf_op.py
+++ b/python/paddle/fluid/tests/unittests/test_linear_chain_crf_op.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import random
-import numpy as np
+import unittest
 
+import numpy as np
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_linear_interp_op.py b/python/paddle/fluid/tests/unittests/test_linear_interp_op.py
index a413f2f7a325b94b6a3b89838fdd1bafd5b5f2a8..c05f55a3634b4b24fbfce158b32a2e9e6e83c258 100755
--- a/python/paddle/fluid/tests/unittests/test_linear_interp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_linear_interp_op.py
@@ -14,11 +14,13 @@
 
 import platform
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_linear_interp_v2_op.py b/python/paddle/fluid/tests/unittests/test_linear_interp_v2_op.py
index 38817856fc999a0c500c937dff20ba846aac1ceb..a56419b81a1507e4abf44a262ecc0471d83cac5a 100755
--- a/python/paddle/fluid/tests/unittests/test_linear_interp_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_linear_interp_v2_op.py
@@ -14,11 +14,13 @@
 
 import platform
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
 from paddle.nn.functional import interpolate
 
diff --git a/python/paddle/fluid/tests/unittests/test_linspace.py b/python/paddle/fluid/tests/unittests/test_linspace.py
index 3549d46ec9eec9e1780cee01b21e15d5798354c7..2e2c2718f9b97b595e25e021f3cc5a4378fd16ad 100644
--- a/python/paddle/fluid/tests/unittests/test_linspace.py
+++ b/python/paddle/fluid/tests/unittests/test_linspace.py
@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
-from paddle.fluid import core
+from paddle.fluid import Program, core, program_guard
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py b/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
index 3bac2d40ae3a20c31391df3bdb617f175e20c3bd..4c63a4f2a9e4c1b43bd31a47c1085a436a5ad64a 100644
--- a/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
@@ -13,17 +13,19 @@
 # limitations under the License.
 
 import os
+
 from dist_test_utils import remove_ps_flag, silentremove
 
 silentremove("test_handle_signal_in_serv_op.flag")
 silentremove("test_list_and_serv_run_empty_optimize_block.flag")
 
-import paddle
-import paddle.fluid as fluid
 import time
 import unittest
 from multiprocessing import Process
 
+import paddle
+import paddle.fluid as fluid
+
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_load_op.py b/python/paddle/fluid/tests/unittests/test_load_op.py
index a299e6aaffe00482d5a505041e899825d4db0ce9..acf0a810293872b19e59680930d2b3304d2601d4 100644
--- a/python/paddle/fluid/tests/unittests/test_load_op.py
+++ b/python/paddle/fluid/tests/unittests/test_load_op.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
+import tempfile
 import unittest
+
 import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import os
-import tempfile
-import paddle
 
 
 class TestLoadOp(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_load_op_xpu.py b/python/paddle/fluid/tests/unittests/test_load_op_xpu.py
index 21e4636ce5b69869ea3dafb018efa8497ce4627e..3ede3b26914881a8e244c42acfc0ab4c14af39e7 100644
--- a/python/paddle/fluid/tests/unittests/test_load_op_xpu.py
+++ b/python/paddle/fluid/tests/unittests/test_load_op_xpu.py
@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
 import os
 import tempfile
+import unittest
+
+import numpy as np
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import paddle
 
 
 @unittest.skipIf(
diff --git a/python/paddle/fluid/tests/unittests/test_load_state_dict_from_old_format.py b/python/paddle/fluid/tests/unittests/test_load_state_dict_from_old_format.py
index 6bace212953a62bd77f0004fe6dd8498e2659885..98518f52f669a4875e4fac53b7126c2d4f2bd658 100644
--- a/python/paddle/fluid/tests/unittests/test_load_state_dict_from_old_format.py
+++ b/python/paddle/fluid/tests/unittests/test_load_state_dict_from_old_format.py
@@ -13,14 +13,15 @@
 # limitations under the License.
 
 import os
+import tempfile
 import unittest
+
 import numpy as np
+from test_imperative_base import new_program_scope
 
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import core
-from test_imperative_base import new_program_scope
-import tempfile
 
 
 def convolutional_neural_network(img):
diff --git a/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py b/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py
index 756b2ab77320ef5e3ed466c43e0773a85e5ad6fa..15d81c68e8c8f310c3a57dd2cf30a0f5da64c044 100644
--- a/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py
+++ b/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import os
 import shutil
+import unittest
+
 import paddle.fluid as fluid
 from paddle.fluid.executor import Executor
 
diff --git a/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py b/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py
index a09707c5767a913e3e97235bc4bde8b43f140b7e..e5b71c2d65e78fb2acf29477310c5ae29cf225a5 100644
--- a/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py
+++ b/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py
@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import copy
 import unittest
+
 import numpy as np
-import copy
 from op_test import OpTest
 from test_multiclass_nms_op import iou
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py b/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py
index 4b702d0a0f0ac163027074ededb579e4c3034b99..4b18c2a9fd81fc4466af0367b8df411411304ec6 100644
--- a/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py
@@ -14,13 +14,14 @@
 
 import unittest
 
+import numpy
+
 import paddle
-import paddle.fluid.layers as layers
-from paddle.fluid.executor import Executor
-import paddle.fluid.core as core
 import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.fluid.layers as layers
 from paddle.fluid import Program, program_guard
-import numpy
+from paddle.fluid.executor import Executor
 
 
 class TestLoDArrayLength(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_lod_rank_table.py b/python/paddle/fluid/tests/unittests/test_lod_rank_table.py
index 88ad04a52c20542ec4f1ebc6bca80465b60a27bc..c523c31a24b44ea0f15f17041441e8b9e066a6df 100644
--- a/python/paddle/fluid/tests/unittests/test_lod_rank_table.py
+++ b/python/paddle/fluid/tests/unittests/test_lod_rank_table.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import unittest
+
+import numpy
+
+from paddle.fluid import Program, core, program_guard
+from paddle.fluid.executor import Executor
 from paddle.fluid.layers import data
 from paddle.fluid.layers.control_flow import lod_rank_table
-from paddle.fluid.executor import Executor
-from paddle.fluid import Program, program_guard, core
-import numpy
-import unittest
 
 
 class TestLoDRankTable(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_lod_reset_op.py b/python/paddle/fluid/tests/unittests/test_lod_reset_op.py
index 5e9bd45907a40c67752ac961112e900b034f88f3..a9c8b47cbb991be491b46d934a7fa119afae35c8 100644
--- a/python/paddle/fluid/tests/unittests/test_lod_reset_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lod_reset_op.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
 from op_test import OpTest
+
+import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lod_tensor_array.py b/python/paddle/fluid/tests/unittests/test_lod_tensor_array.py
index c6656ff1caa66b0eb08352093952dc2e006a1ec6..d38627ebec46e2d932495cd88add1f16dad61049 100644
--- a/python/paddle/fluid/tests/unittests/test_lod_tensor_array.py
+++ b/python/paddle/fluid/tests/unittests/test_lod_tensor_array.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
+import numpy as np
+
 import paddle
 import paddle.fluid.core as core
-import numpy as np
 
 
 class TestLoDTensorArray(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_log_loss_op.py b/python/paddle/fluid/tests/unittests/test_log_loss_op.py
index 35d31128732bd850fc0433b983440ae50dbf9e73..908f4bf94e510f7dc71704b0758fa9e24d07d2b8 100644
--- a/python/paddle/fluid/tests/unittests/test_log_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_log_loss_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_log_softmax.py b/python/paddle/fluid/tests/unittests/test_log_softmax.py
index ab371869c85c97e96fc272aba88cc85e1bcc3785..274d4cf05bd098d95e3cb17e4d40c239149433ca 100644
--- a/python/paddle/fluid/tests/unittests/test_log_softmax.py
+++ b/python/paddle/fluid/tests/unittests/test_log_softmax.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from paddle.fluid.tests.unittests.op_test import OpTest, convert_float_to_uint16
+
 import paddle
 import paddle.fluid.core as core
 import paddle.nn.functional as F
+from paddle.fluid.tests.unittests.op_test import OpTest, convert_float_to_uint16
 
 np.random.seed(10)
 
diff --git a/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py b/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py
index 96f0e4bff6a669574a799ef8b818c5075b7f6bf5..556db0f258564402963b8fc3cb4b2d46dbe38b09 100644
--- a/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py
@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import Optional
-import unittest
 import itertools
+import unittest
+from typing import Optional
+
 import numpy as np
+from op_test import OpTest
+
 import paddle
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-from op_test import OpTest
+import paddle.fluid.core as core
 
 
 def np_naive_logcumsumexp(x: np.ndarray, axis: Optional[int] = None):
diff --git a/python/paddle/fluid/tests/unittests/test_logical_op.py b/python/paddle/fluid/tests/unittests/test_logical_op.py
index c05d99a4d941674a68144b08e729329d233eed73..02466986238c103f7df78477d699bebb9a921cd8 100755
--- a/python/paddle/fluid/tests/unittests/test_logical_op.py
+++ b/python/paddle/fluid/tests/unittests/test_logical_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
-from paddle.static import Program, program_guard, Executor
-from paddle.framework import _non_static_mode
 from paddle.fluid.framework import _test_eager_guard
+from paddle.framework import _non_static_mode
+from paddle.static import Executor, Program, program_guard
 
 SUPPORTED_DTYPES = [
     bool,
diff --git a/python/paddle/fluid/tests/unittests/test_logit_op.py b/python/paddle/fluid/tests/unittests/test_logit_op.py
index 74f645fb68d1c8952a289c1ec4d5928111fddaa4..464247d3e73ab048ffdd5dabef67c7c665d233b7 100644
--- a/python/paddle/fluid/tests/unittests/test_logit_op.py
+++ b/python/paddle/fluid/tests/unittests/test_logit_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_logspace.py b/python/paddle/fluid/tests/unittests/test_logspace.py
index 170d056895a941995065f83820ff010c20466b1a..2a0d466a600d89a813b7df95a52659f10bd67147 100644
--- a/python/paddle/fluid/tests/unittests/test_logspace.py
+++ b/python/paddle/fluid/tests/unittests/test_logspace.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_logsumexp.py b/python/paddle/fluid/tests/unittests/test_logsumexp.py
index 1389ad1564fd1cf23a00d7d7c4c93f728ae17365..eed00f73e727415add9a001dd73f5ed52fb4dd39 100644
--- a/python/paddle/fluid/tests/unittests/test_logsumexp.py
+++ b/python/paddle/fluid/tests/unittests/test_logsumexp.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
-import paddle.fluid.core as core
 from op_test import OpTest
 
+import paddle
+import paddle.fluid.core as core
+
 
 def ref_logsumexp(x, axis=None, keepdim=False, reduce_all=False):
     if isinstance(axis, int):
diff --git a/python/paddle/fluid/tests/unittests/test_lookahead.py b/python/paddle/fluid/tests/unittests/test_lookahead.py
index ab8394c2f7dd297af49bbe26a79efe55a69f20e9..e90c9bf0c8b629667b656b0968d354e9748146c3 100644
--- a/python/paddle/fluid/tests/unittests/test_lookahead.py
+++ b/python/paddle/fluid/tests/unittests/test_lookahead.py
@@ -13,9 +13,11 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-import paddle.fluid as fluid
+
 import paddle
+import paddle.fluid as fluid
 import paddle.nn as nn
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_bf16_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_bf16_op.py
index ca60044439649fec6a9e2f16b0e3a8c4befa9cf2..ec9eee17c0141600651bd4074667042b64a856f9 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_bf16_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_bf16_op.py
@@ -13,17 +13,19 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
+import paddle.fluid as fluid
+import paddle.fluid.core as core
+from paddle import enable_static
+from paddle.fluid.op import Operator
 from paddle.fluid.tests.unittests.op_test import (
     OpTest,
     convert_float_to_uint16,
     convert_uint16_to_float,
     skip_check_grad_ci,
 )
-import paddle.fluid as fluid
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
-from paddle import enable_static
 
 
 def _lookup(weights, ids, flat_ids, op_version="lookup_table"):
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py
index 42a491344c62cd994f0f40390817f5a07d1a40da..19b7ca2597be5a0c6418397f637b10194220e2bc 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import struct
 import unittest
+
 import numpy as np
 from op_test import OpTest
-import struct
 
 
 class TestLookupTableDequantOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_op.py
index 02fccaaca223281c9a7f35678f06b14c7052abcf..1892ce5c56d55a5254389a636c2e984aeb96cc83 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_op.py
@@ -13,13 +13,15 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci, check_out_dtype
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
+from op_test import OpTest, check_out_dtype, skip_check_grad_ci
+
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
+import paddle.fluid.core as core
 import paddle.nn.functional as F
+from paddle.fluid import Program, program_guard
+from paddle.fluid.op import Operator
 
 
 class TestLookupTableOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py
index e0dbf743430c6625c5917eeec0796e2dc2abdf23..c022f564809a981ad8dd8268b349f0a068db4606 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py
@@ -13,18 +13,20 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
+
 import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid.tests.unittests.op_test import convert_uint16_to_float
 from paddle.fluid.tests.unittests.test_lookup_table_bf16_op import (
-    _lookup,
     TestLookupTableBF16Op,
     TestLookupTableBF16OpIds4D,
     TestLookupTableBF16OpWIsSelectedRows,
     TestLookupTableBF16OpWIsSelectedRows4DIds,
+    _lookup,
 )
-import paddle.fluid as fluid
-import paddle.fluid.core as core
 
 
 class TestLookupTableV2BF16Op(TestLookupTableBF16Op):
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_v2_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_v2_op.py
index e39df64180da4f798bc947ac4a45b0efde7323dc..2a74fff41d734f55c2c1d5c50d3584e78289feaa 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_v2_op.py
@@ -13,14 +13,15 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest, skip_check_grad_ci
+
 import paddle
-import paddle.fluid.core as core
-import paddle.fluid as fluid
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 from paddle.fluid import Program, program_guard
+from paddle.fluid.op import Operator
 
 
 class TestStaticGraphSupportMultipleInt(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_lr_scheduler.py b/python/paddle/fluid/tests/unittests/test_lr_scheduler.py
index d1f656a5663b69051ad81ad28f459076d70bc5e6..4d87942ef799bd5a0d2cd1eb44ad7f081b885061 100644
--- a/python/paddle/fluid/tests/unittests/test_lr_scheduler.py
+++ b/python/paddle/fluid/tests/unittests/test_lr_scheduler.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import math
-import numpy as np
 import unittest
 
+import numpy as np
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
diff --git a/python/paddle/fluid/tests/unittests/test_lrn_op.py b/python/paddle/fluid/tests/unittests/test_lrn_op.py
index 521889f53eca76e0edce360599c4d819b12ce9dd..36aab4fb5adf24842f8dc633210249b8c2fa5417 100644
--- a/python/paddle/fluid/tests/unittests/test_lrn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lrn_op.py
@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import unittest
+
 import numpy as np
+from op_test import OpTest
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from op_test import OpTest
 from paddle.fluid import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lstm_cudnn_op.py b/python/paddle/fluid/tests/unittests/test_lstm_cudnn_op.py
index b82b38c7ba5f6401e20a13ee48baa27fb74d88ae..cbc7450bbc6d218c108c7463bb6a46bbdafb7325 100644
--- a/python/paddle/fluid/tests/unittests/test_lstm_cudnn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lstm_cudnn_op.py
@@ -12,16 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-import numpy as np
 import math
+import random
+import unittest
 
-import paddle.fluid.core as core
+import numpy as np
 from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
+import paddle.fluid.core as core
 import paddle.fluid.layers as layers
-import random
 
 random.seed(2)
 np.set_printoptions(threshold=np.inf)
diff --git a/python/paddle/fluid/tests/unittests/test_lstm_op.py b/python/paddle/fluid/tests/unittests/test_lstm_op.py
index aeb9b28c860c0012a0fe4a4f7fa565fa621952b5..8df805a231b92dc50e35ab042d6f7a65a4cc8443 100644
--- a/python/paddle/fluid/tests/unittests/test_lstm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lstm_op.py
@@ -13,12 +13,14 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 from paddle import fluid
-from paddle.fluid.layers import lstm as LSTM
+from paddle.fluid.framework import Program, program_guard
 from paddle.fluid.layers import fill_constant
-from paddle.fluid.framework import program_guard, Program
+from paddle.fluid.layers import lstm as LSTM
 
 SIGMOID_THRESHOLD_MIN = -40.0
 SIGMOID_THRESHOLD_MAX = 13.0
diff --git a/python/paddle/fluid/tests/unittests/test_lstm_unit_op.py b/python/paddle/fluid/tests/unittests/test_lstm_unit_op.py
index d46e8e4719e818851c0cf6acfaed30dc1041f21b..e389ae936b6fae8f59ced2d2b6ebe4665f028aad 100644
--- a/python/paddle/fluid/tests/unittests/test_lstm_unit_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lstm_unit_op.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 from op_test import OpTest
+
 from paddle import fluid
+from paddle.fluid.framework import Program, program_guard
 from paddle.fluid.layers import lstm_unit
-from paddle.fluid.framework import program_guard, Program
 
 
 def sigmoid_np(x):
diff --git a/python/paddle/fluid/tests/unittests/test_lstmp_op.py b/python/paddle/fluid/tests/unittests/test_lstmp_op.py
index 730af353dce6be11a8603455cc25652c763631cc..c299f54159465e1cd7df5c2605a52fcd4f3145bb 100644
--- a/python/paddle/fluid/tests/unittests/test_lstmp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lstmp_op.py
@@ -13,8 +13,10 @@
 # limitations under the License.
 
 import unittest
+
 import numpy as np
 import test_lstm_op as LstmTest
+
 from paddle import fluid
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_lu_op.py b/python/paddle/fluid/tests/unittests/test_lu_op.py
index d76fdf16ad9334c13182f2fde06380803fdc8e3f..790ebb36f6d7c24a08acd171e38d34cf96829657 100644
--- a/python/paddle/fluid/tests/unittests/test_lu_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lu_op.py
@@ -12,16 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from op_test import OpTest
-import unittest
+import copy
 import itertools
+import unittest
+
 import numpy as np
+import scipy
+import scipy.linalg
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import scipy
-import scipy.linalg
-import copy
 
 
 def scipy_lu(A, pivot):
diff --git a/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py b/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py
index 0c00fbea8208808fc9cce8f9a1596fd83725a3f3..677ae648fbe09bb320e410313248333b637251ef 100644
--- a/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py
@@ -12,16 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from op_test import OpTest
-import unittest
+import copy
 import itertools
+import unittest
+
 import numpy as np
+import scipy
+import scipy.linalg
+from op_test import OpTest
+
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import scipy
-import scipy.linalg
-import copy
 
 
 def scipy_lu_unpack(A):