[BugFix] fixed a bug in decorator transformer, it can not analyze decorator...

[BugFix] fixed a bug in decorator transformer, it can not analyze decorator with params correctly (#46055)

* fix deco call

* add raise

* add test

* add warn, fix paddle api

* fix error type

* fix coverage

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

@@ -47,8 +47,6 @@ from paddle.fluid.dygraph.dygraph_to_static.utils import get_attribute_full_name
 
 __all__ = ['DygraphToStaticAst']
 
-DECORATOR_NAMES = ['declarative', 'to_static', 'dygraph_to_static_func']
-
 
 def apply_optimization(transformers):
     """

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

@@ -18,13 +18,14 @@ from __future__ import print_function
 from paddle.utils import gast
 from paddle.fluid.dygraph.dygraph_to_static.static_analysis import AstNodeWrapper
 from paddle.fluid.dygraph.dygraph_to_static.base_transformer import BaseTransformer
-from paddle.fluid.dygraph.dygraph_to_static.utils import create_funcDef_node, ast_to_source_code
+from paddle.fluid.dygraph.dygraph_to_static.utils import create_funcDef_node, ast_to_source_code, is_paddle_api, Dygraph2StaticException
+import warnings
 
 import re
 
 IGNORE_NAMES = [
     'declarative', 'to_static', 'dygraph_to_static_func', 'wraps',
-    'staticmethod', 'classmethod'
+    'staticmethod', 'classmethod', 'decorator'
 ]
 
 
@@ -77,20 +78,35 @@ class DecoratorTransformer(BaseTransformer):
                 deco_name = deco.id
             if deco_name in IGNORE_NAMES:
                 continue
+            elif deco_name == 'contextmanager':
+                warnings.warn(
+                    "Dy2Static : A context manager decorator is used, this may not work correctly after transform."
+                )
 
-            # get function after decoration
             deco_full_name = ast_to_source_code(deco).strip()
-            decoed_func = '_decoby_' + deco_name
+            decoed_func = '_decoedby_' + deco_name
+
+            # get function after decoration
             if isinstance(deco, gast.Call):
+                if '_jst.Call' in deco_full_name:
                     # in this case , the deco_full_name will be like:
                     # '_jst.Call(deco)(5)'
-                rematch = re.match(r'\_jst\.Call\((.+?)\)\((.+?)\)',
+                    rematch = re.match(r'\_jst\.Call\((.+?)\)\((.*)\)',
                                        deco_full_name)
                     re_name = rematch.group(1)
                     re_args = rematch.group(2)
                     re_args_with_func = deco_target + ', ' + re_args
                     decofun_str = 'try:\n\t{0} = _jst.Call({1})({2})\nexcept:\n\t{0} = _jst.Call({1})({3})({4})'\
                         .format(decoed_func, re_name, re_args_with_func, re_args, deco_target)
+                else:
+                    # paddle api will not be transformed to '_jst.Call'
+                    rematch = re.match(r'(.+?)\((.*)\)', deco_full_name)
+                    re_name = rematch.group(1)
+                    re_args = rematch.group(2)
+                    re_args_with_func = deco_target + ', ' + re_args
+                    decofun_str = 'try:\n\t{0} = {1}({2})\nexcept:\n\t{0} = {1}({3})({4})'\
+                        .format(decoed_func, re_name, re_args_with_func, re_args, deco_target)
+
             else:
                 decofun_str = '{} = _jst.Call({})({})'.format(
                     decoed_func, deco_full_name, deco_target)

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

@@ -18,7 +18,9 @@ import paddle
 import unittest
 import numpy as np
 import decos
+import warnings
 from functools import wraps
+from contextlib import contextmanager
 
 
 def deco1(func):
@@ -84,6 +86,14 @@ def deco4(func=None, x=0):
     return decorated(func)
 
 
+def deco5():
+    return deco2
+
+
+def deco6(x=0):
+    return deco2
+
+
 @deco2
 def fun1(x, y=0):
     a = paddle.to_tensor(y)
@@ -114,7 +124,7 @@ def fun4(x, y=0):
 
 
 @deco2
-@deco4(x=5)
+@deco4()
 def fun5(x, y=0):
     a = paddle.to_tensor(y)
     print('in fun5, x=%d' % (x))
@@ -129,15 +139,55 @@ def fun6(x, y=0):
     return a
 
 
+@deco5()
+def fun7(x, y=0):
+    a = paddle.to_tensor(y)
+    print('in fun7, x=%d' % (x))
+    return a
+
+
+@deco6(2)
+def fun8(x, y=0):
+    a = paddle.to_tensor(y)
+    print('in fun8, x=%d' % (x))
+    return a
+
+
 @paddle.jit.to_static
 def forward():
-    funcs = [fun1, fun2, fun3, fun4, fun5, fun6]
+    funcs = [fun1, fun2, fun3, fun4, fun5, fun6, fun7, fun8]
     out = []
     for idx, fun in enumerate(funcs):
         out.append(fun(idx + 1, idx + 1))
     return out
 
 
+@contextmanager
+def contextmanager_warning():
+    yield
+
+
+@contextmanager_warning()
+def fun9():
+    print('in fun9 want contextmanager warning')
+
+
+@paddle.jit.to_static
+def warn1():
+    fun9()
+
+
+@paddle.no_grad()
+def fun10():
+    print('in fun10, paddle api decorated')
+    return True
+
+
+@paddle.jit.to_static
+def deco_with_paddle_api():
+    return fun10()
+
+
 class TestDecoratorTransform(unittest.TestCase):
 
     def test_deco_transform(self):
@@ -146,8 +196,27 @@ class TestDecoratorTransform(unittest.TestCase):
         np.testing.assert_allclose(outs[1], np.array(5), rtol=1e-05)
         np.testing.assert_allclose(outs[2], np.array(6), rtol=1e-05)
         np.testing.assert_allclose(outs[3], np.array(8), rtol=1e-05)
-        np.testing.assert_allclose(outs[4], np.array(12), rtol=1e-05)
+        np.testing.assert_allclose(outs[4], np.array(7), rtol=1e-05)
         np.testing.assert_allclose(outs[5], np.array(9), rtol=1e-05)
+        np.testing.assert_allclose(outs[6], np.array(9), rtol=1e-05)
+        np.testing.assert_allclose(outs[7], np.array(10), rtol=1e-05)
+
+    def test_contextmanager_warning(self):
+        paddle.disable_static()
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            warn1()
+            flag = False
+            for warn in w:
+                if (issubclass(warn.category, UserWarning)
+                    ) and "A context manager decorator is used" in str(
+                        warn.message):
+                    flag = True
+                    break
+            self.assertTrue(flag)
+
+    def test_deco_with_paddle_api(self):
+        self.assertTrue(deco_with_paddle_api())
 
 
 if __name__ == '__main__':