[Cherry-pick][Dy2Stat]Support convert sublayers in Sequential Container (#32978) (#33065)

* Support convert sublayers in Sequential Container

* remove paddle.jit.set_code_level

python/paddle/fluid/dygraph/dygraph_to_static/convert_call_func.py

@@ -26,6 +26,7 @@ import types
 import numpy
 import six
 
+from paddle.fluid.dygraph.container import Sequential
 from paddle.fluid.dygraph.dygraph_to_static.convert_operators import convert_len
 from paddle.fluid.dygraph.dygraph_to_static.logging_utils import TranslatorLogger
 from paddle.fluid.dygraph.dygraph_to_static.program_translator import StaticFunction
@@ -40,6 +41,9 @@ __all__ = ["convert_call"]
 BUILTIN_LIKELY_MODULES = [
     collections, pdb, copy, inspect, re, six, numpy, logging
 ]
+# The api(s) should be considered as plain function and convert
+# them into static layer code.
+PADDLE_NEED_CONVERT_APIS = [Sequential]
 
 translator_logger = TranslatorLogger()
 
@@ -92,6 +96,10 @@ def is_unsupported(func):
                     format(func))
                 return True
 
+    # NOTE: should be placed before `is_paddle_func`
+    if type(func) in PADDLE_NEED_CONVERT_APIS:
+        return False
+
     if is_paddle_func(func):
         translator_logger.log(
             2,

python/paddle/fluid/tests/unittests/dygraph_to_static/test_container.py

+# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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 paddle
+import unittest
+import numpy as np
+
+
+class BufferLayers(paddle.nn.Layer):
+    def __init__(self, out_channel):
+        super(BufferLayers, self).__init__()
+        self.out_channel = out_channel
+
+    def forward(self, x):
+        mean = paddle.mean(x)
+        if mean < 0.:
+            x = x * self._mask()
+
+        out = x - mean
+        return out
+
+    def _mask(self):
+        return paddle.to_tensor(np.zeros([self.out_channel], 'float32'))
+
+
+class SequentialNet(paddle.nn.Layer):
+    def __init__(self, sub_layer, in_channel, out_channel):
+        super(SequentialNet, self).__init__()
+        self.layer = paddle.nn.Sequential(
+            ('l1', paddle.nn.Linear(in_channel, in_channel)),
+            ('l2', paddle.nn.Linear(in_channel, out_channel)),
+            ('l3', sub_layer(out_channel)))
+
+    def forward(self, x):
+        out = self.layer(x)
+        return out
+
+
+class TestSequential(unittest.TestCase):
+    def setUp(self):
+        paddle.set_device('cpu')
+        self.seed = 2021
+
+    def _init_seed(self):
+        paddle.seed(self.seed)
+        np.random.seed(self.seed)
+
+    def _run(self, to_static):
+        self._init_seed()
+        net = SequentialNet(BufferLayers, 10, 3)
+        if to_static:
+            net = paddle.jit.to_static(net)
+        x = paddle.rand([16, 10], 'float32')
+        out = net(x)
+        if to_static:
+            load_out = self._test_load(net, x)
+            self.assertTrue(
+                np.allclose(load_out, out),
+                msg='load_out is {}\st_out is {}'.format(load_out, out))
+
+        return out
+
+    def test_train(self):
+        paddle.jit.set_code_level(100)
+        dy_out = self._run(to_static=False)
+        st_out = self._run(to_static=True)
+        self.assertTrue(
+            np.allclose(dy_out, st_out),
+            msg='dygraph_res is {}\nstatic_res is {}'.format(dy_out, st_out))
+
+    def _test_load(self, net, x):
+        model_path = './sequential_net'
+        paddle.jit.save(net, model_path)
+        load_net = paddle.jit.load(model_path)
+        out = load_net(x)
+        return out
+
+
+if __name__ == '__main__':
+    unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_list.py

@@ -62,9 +62,6 @@ def test_list_append_in_for_loop(x, iter_num):
     return a[0]
 
 
-paddle.jit.set_code_level(100)
-
-
 def test_list_append_in_for_subscript(x):
     x = fluid.dygraph.to_variable(x)
     iter_num = paddle.shape(x)[0]