[Dy2Stat]Support Python3 type hint (#33745)

* support type hint

* fix unittest

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

@@ -485,8 +485,7 @@ def ast_to_func(ast_root, dyfunc, delete_on_exit=True):
             os.remove(filepath)
 
     source = ast_to_source_code(ast_root)
-    import_fluid = "import paddle\nimport paddle.fluid as fluid\n"
-    source = import_fluid + source
+    source = _inject_import_statements() + source
 
     f = tempfile.NamedTemporaryFile(
         mode='w', suffix='.py', delete=False, encoding='utf-8')
@@ -519,6 +518,14 @@ def ast_to_func(ast_root, dyfunc, delete_on_exit=True):
     return callable_func, f.name
 
 
+def _inject_import_statements():
+    import_statements = [
+        "import paddle", "import paddle.fluid as fluid", "from typing import *",
+        "import numpy as np"
+    ]
+    return '\n'.join(import_statements) + '\n'
+
+
 def recover_globals_attribute(src_obj, dst_obj):
     attr_name = '__globals__'
 

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

@@ -65,7 +65,7 @@ class TestOriginInfo(unittest.TestCase):
         self.func = simple_func
 
     def set_static_lineno(self):
-        self.static_abs_lineno_list = [3, 4, 5]
+        self.static_abs_lineno_list = [5, 6, 7]
 
     def set_dygraph_info(self):
         self.line_num = 3
@@ -149,7 +149,7 @@ class TestOriginInfoWithNestedFunc(TestOriginInfo):
         self.func = nested_func
 
     def set_static_lineno(self):
-        self.static_abs_lineno_list = [3, 5, 6, 7, 8]
+        self.static_abs_lineno_list = [5, 7, 8, 9, 10]
 
     def set_dygraph_info(self):
         self.line_num = 5
@@ -174,7 +174,7 @@ class TestOriginInfoWithDecoratedFunc(TestOriginInfo):
         self.func = decorated_func
 
     def set_static_lineno(self):
-        self.static_abs_lineno_list = [3, 4]
+        self.static_abs_lineno_list = [5, 6]
 
     def set_dygraph_info(self):
         self.line_num = 2
@@ -208,7 +208,7 @@ class TestOriginInfoWithDecoratedFunc2(TestOriginInfo):
         self.func = decorated_func2
 
     def set_static_lineno(self):
-        self.static_abs_lineno_list = [3, 4]
+        self.static_abs_lineno_list = [5, 6]
 
     def set_dygraph_info(self):
         self.line_num = 2

python/paddle/fluid/tests/unittests/dygraph_to_static/test_typing.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
+from typing import Tuple, List, Dict, TypeVar
+
+
+class BaseLayer(paddle.nn.Layer):
+    def __init__(self, in_size, out_size):
+        super(BaseLayer, self).__init__()
+        self._linear = paddle.nn.Linear(in_size, out_size)
+
+    def build(self, x):
+        out1 = self._linear(x)
+        out2 = paddle.mean(out1)
+        return out1, out2
+
+
+class LinearNetWithTuple(BaseLayer):
+    def __init__(self, in_size, out_size):
+        super(LinearNetWithTuple, self).__init__(in_size, out_size)
+
+    def forward(self, x) -> Tuple[paddle.Tensor, str]:
+        out1, out2 = self.build(x)
+        return (out2, 'str')
+
+
+class LinearNetWithTuple2(BaseLayer):
+    def __init__(self, in_size, out_size):
+        super(LinearNetWithTuple2, self).__init__(in_size, out_size)
+
+    def forward(self, x) -> Tuple[paddle.Tensor, np.array]:
+        out1, out2 = self.build(x)
+        return (out2, np.ones([4, 16]))
+
+
+class LinearNetWithList(BaseLayer):
+    def __init__(self, in_size, out_size):
+        super(LinearNetWithList, self).__init__(in_size, out_size)
+
+    def forward(self, x) -> List[paddle.Tensor]:
+        out1, out2 = self.build(x)
+        return [out2]
+
+
+class LinearNetWithDict(BaseLayer):
+    def __init__(self, in_size, out_size):
+        super(LinearNetWithDict, self).__init__(in_size, out_size)
+
+    def forward(self, x) -> Dict[str, paddle.Tensor]:
+        out1, out2 = self.build(x)
+        return {'out': out2}
+
+
+class TestTyping(unittest.TestCase):
+    def setUp(self):
+        self.in_num = 16
+        self.out_num = 16
+        self.x = paddle.randn([4, 16])
+        self.spec = [paddle.static.InputSpec(shape=[None, 16], dtype='float32')]
+
+    def build_net(self):
+        return LinearNetWithTuple(self.in_num, self.out_num)
+
+    def save_and_load(self, suffix=''):
+        path = './layer_typing_' + suffix
+        paddle.jit.save(self.net, path, input_spec=self.spec)
+        return paddle.jit.load(path)
+
+    def run_dy(self):
+        out, _ = self.net(self.x)
+        return out
+
+    def test_type(self):
+        self.net = self.build_net()
+        out = self.run_dy()
+        load_net = self.save_and_load('tuple')
+        load_out = load_net(self.x)
+        self.assertTrue(np.allclose(out, load_out))
+
+
+class TestTypingTuple(TestTyping):
+    def build_net(self):
+        return LinearNetWithTuple2(self.in_num, self.out_num)
+
+    def run_dy(self):
+        out, np_data = self.net(self.x)
+        self.assertTrue(np.equal(np_data, np.ones_like(np_data)).all())
+        return out
+
+
+class TestTypingList(TestTyping):
+    def build_net(self):
+        return LinearNetWithList(self.in_num, self.out_num)
+
+    def run_dy(self):
+        out = self.net(self.x)[0]
+        return out
+
+
+class TestTypingDict(TestTyping):
+    def build_net(self):
+        return LinearNetWithDict(self.in_num, self.out_num)
+
+    def run_dy(self):
+        out = self.net(self.x)['out']
+        return out
+
+
+if __name__ == '__main__':
+    unittest.main()