diff --git a/python/paddle/optimizer/__init__.py b/python/paddle/optimizer/__init__.py
index edebfdfcf3710049f851945632c1c09d443a7709..07d2935bc764664c88e42494962af46ad4831191 100644
--- a/python/paddle/optimizer/__init__.py
+++ b/python/paddle/optimizer/__init__.py
@@ -12,19 +12,27 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__all__ = [
-    'Optimizer', 'Adagrad', 'Adam', 'AdamW', 'Adamax', 'RMSProp', 'Adadelta',
-    'SGD', 'Momentum', 'Lamb', 'lr'
-]
+from .optimizer import Optimizer  # noqa: F401
+from .adagrad import Adagrad  # noqa: F401
+from .adam import Adam  # noqa: F401
+from .adamw import AdamW  # noqa: F401
+from .adamax import Adamax  # noqa: F401
+from .rmsprop import RMSProp  # noqa: F401
+from .adadelta import Adadelta  # noqa: F401
+from .sgd import SGD  # noqa: F401
+from .momentum import Momentum  # noqa: F401
+from .lamb import Lamb  # noqa: F401
+from . import lr  # noqa: F401
 
-from .optimizer import Optimizer
-from .adagrad import Adagrad
-from .adam import Adam
-from .adamw import AdamW
-from .adamax import Adamax
-from .rmsprop import RMSProp
-from .adadelta import Adadelta
-from .sgd import SGD
-from .momentum import Momentum
-from .lamb import Lamb
-from . import lr
+__all__ = [     #noqa
+           'Optimizer',
+           'Adagrad',
+           'Adam',
+           'AdamW',
+           'Adamax',
+           'RMSProp',
+           'Adadelta',
+           'SGD',
+           'Momentum',
+           'Lamb'
+]
diff --git a/python/paddle/optimizer/adadelta.py b/python/paddle/optimizer/adadelta.py
index e921eda41cfb6a003994a36e8da16892c8150c77..42e2a5851c21bd3218ef319e40db6d446971c6b3 100644
--- a/python/paddle/optimizer/adadelta.py
+++ b/python/paddle/optimizer/adadelta.py
@@ -17,8 +17,6 @@ from ..fluid import core
 from ..fluid import framework
 from ..fluid.framework import Variable, name_scope
 
-__all__ = ["Adadelta"]
-
 
 class Adadelta(Optimizer):
     r"""
diff --git a/python/paddle/optimizer/adagrad.py b/python/paddle/optimizer/adagrad.py
index ec14828e693ee67c03a748622bc1034f1303d80f..d3077949ff0aed02e22c889a15c613d572f0871d 100644
--- a/python/paddle/optimizer/adagrad.py
+++ b/python/paddle/optimizer/adagrad.py
@@ -17,8 +17,6 @@ from ..fluid import core
 from ..fluid import framework
 from ..fluid.framework import Variable
 
-__all__ = ["Adagrad"]
-
 
 class Adagrad(Optimizer):
     r"""
diff --git a/python/paddle/optimizer/adam.py b/python/paddle/optimizer/adam.py
index 0cafbda893dd2f638886e55e4a1e1d55a5252c31..dcedf4fc5020aa1fdb79ea6b48e095f598dc27e8 100644
--- a/python/paddle/optimizer/adam.py
+++ b/python/paddle/optimizer/adam.py
@@ -24,8 +24,6 @@ from ..fluid.dygraph import base as imperative_base
 
 import paddle
 
-__all__ = ["Adam"]
-
 
 class Adam(Optimizer):
     r"""
diff --git a/python/paddle/optimizer/adamax.py b/python/paddle/optimizer/adamax.py
index 4a6c2278a46f40774afb83a5222bfeac2c776305..9d5adf0bba508a4c213e9fc9b18bec1e737cc9ac 100644
--- a/python/paddle/optimizer/adamax.py
+++ b/python/paddle/optimizer/adamax.py
@@ -17,8 +17,6 @@ from ..fluid import core
 from ..fluid import framework
 from ..fluid.framework import Variable, name_scope
 
-__all__ = ["Adamax"]
-
 
 class Adamax(Optimizer):
     r"""
diff --git a/python/paddle/optimizer/adamw.py b/python/paddle/optimizer/adamw.py
index 32645720c4f73e7be669fb70bfd2c988b96f616e..eb88a48f30320a5d0f632ddfdb2df504b604d31f 100644
--- a/python/paddle/optimizer/adamw.py
+++ b/python/paddle/optimizer/adamw.py
@@ -19,8 +19,6 @@ from ..fluid import framework
 from ..fluid.dygraph import base as imperative_base
 import paddle
 
-__all__ = ['AdamW']
-
 
 class AdamW(Adam):
     r"""
diff --git a/python/paddle/optimizer/lamb.py b/python/paddle/optimizer/lamb.py
index a692f59de5b5fe0865af995c834ec2e39b5db457..bab130ec5909895cbf470ee76a2ef34f76dfa53c 100644
--- a/python/paddle/optimizer/lamb.py
+++ b/python/paddle/optimizer/lamb.py
@@ -17,8 +17,6 @@ from ..fluid import core
 from ..fluid import framework
 from ..fluid.framework import Variable
 
-__all__ = ["Lamb"]
-
 
 class Lamb(Optimizer):
     r"""
diff --git a/python/paddle/optimizer/lr.py b/python/paddle/optimizer/lr.py
index 484b4fb7246a766ea4ee984980b0fc0ffecabf4e..f269bffc75ed9c07992b9a572da56b309281405c 100644
--- a/python/paddle/optimizer/lr.py
+++ b/python/paddle/optimizer/lr.py
@@ -17,10 +17,19 @@ import numpy
 import warnings
 from paddle import Tensor
 
-__all__ = [
-    'LRScheduler', 'NoamDecay', 'PiecewiseDecay', 'NaturalExpDecay',
-    'InverseTimeDecay', 'PolynomialDecay', 'LinearWarmup', 'ExponentialDecay',
-    'MultiStepDecay', 'StepDecay', 'LambdaDecay', 'ReduceOnPlateau',
+__all__ = [ #noqa
+    'LRScheduler',
+    'NoamDecay',
+    'PiecewiseDecay',
+    'NaturalExpDecay',
+    'InverseTimeDecay',
+    'PolynomialDecay',
+    'LinearWarmup',
+    'ExponentialDecay',
+    'MultiStepDecay',
+    'StepDecay',
+    'LambdaDecay',
+    'ReduceOnPlateau',
     'CosineAnnealingDecay'
 ]
 
diff --git a/python/paddle/optimizer/momentum.py b/python/paddle/optimizer/momentum.py
index 111b2720c86687f141169c963ec69f48cfe01df2..932a4ad100ec4aea2ded1fa242acc1c280ac0dae 100644
--- a/python/paddle/optimizer/momentum.py
+++ b/python/paddle/optimizer/momentum.py
@@ -21,7 +21,6 @@ from ..fluid import unique_name
 from ..fluid import layers
 import paddle.fluid as fluid
 from paddle.fluid.regularizer import L2DecayRegularizer
-__all__ = ["Momentum"]
 
 
 class Momentum(Optimizer):
diff --git a/python/paddle/optimizer/optimizer.py b/python/paddle/optimizer/optimizer.py
index 0d44df59012c031cf34735ff10f1a9ec32389399..a050852728da96479b76f38cd1c74a3f4c4e6a6f 100644
--- a/python/paddle/optimizer/optimizer.py
+++ b/python/paddle/optimizer/optimizer.py
@@ -42,8 +42,6 @@ from ..fluid.wrapped_decorator import signature_safe_contextmanager
 from .. import compat as cpt
 from .lr import LRScheduler
 
-__all__ = ['Optimizer']
-
 
 class Optimizer(object):
     r"""Optimizer Base class.
diff --git a/python/paddle/optimizer/rmsprop.py b/python/paddle/optimizer/rmsprop.py
index 12825bb781381253186bad500c6009b8b8d1db43..7146b7d89935c9b45fbcf12726c2225ab4df5814 100644
--- a/python/paddle/optimizer/rmsprop.py
+++ b/python/paddle/optimizer/rmsprop.py
@@ -17,8 +17,6 @@ from ..fluid import core
 from ..fluid import framework
 from ..fluid.framework import Variable
 
-__all__ = ["RMSProp"]
-
 
 class RMSProp(Optimizer):
     r"""
diff --git a/python/paddle/optimizer/sgd.py b/python/paddle/optimizer/sgd.py
index b2937ff1620643d9cd2ca9a92d45f2dabdb161d4..fc208519a2e61397717f354776ad1951041ad472 100644
--- a/python/paddle/optimizer/sgd.py
+++ b/python/paddle/optimizer/sgd.py
@@ -17,7 +17,6 @@ from ..fluid import core
 from ..fluid import framework
 from ..fluid.framework import Variable, name_scope
 from ..fluid.dygraph import no_grad
-__all__ = ["SGD"]
 
 
 class SGD(Optimizer):