[Dy2Stat] Fix eval_if_exist_else_none bug (#31261) (#31277)

* fix eval_if_exist_else_none bug

* fix typo

* fix typo

* fix test_op_num unittest

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

@@ -302,9 +302,19 @@ def convert_var_shape_simple(x):
         return x.shape
 
 
-def eval_if_exist_else_none(name):
+def eval_if_exist_else_none(name, local_symbol_table):
+    """
+    Args:
+        name([str]): Expression passed into `eval`.
+        local_symbol_table(dict): Specified from `locals()`. DO NOT use `globals()`,
+                                  it has a higher priority and will hide away variables
+                                  from `locals()`.
+    
+    Returns:
+        Return the variable if found in local_symbol_table else None.
+    """
     try:
-        return eval(name)
+        return eval(name, local_symbol_table)
     except:
         return None
 

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

@@ -58,7 +58,8 @@ def create_convert_shape_node(var_shape_node,
 
 
 def create_choose_shape_node(attr_shape_name, api_shape_name, slice_node=None):
-    eval_exist_func = "paddle.jit.dy2static.eval_if_exist_else_none('{}')".format(
+    # Note(Aurelius84): Add `locals()` to help `eval` to locate the variable correctly.
+    eval_exist_func = "paddle.jit.dy2static.eval_if_exist_else_none('{}', locals())".format(
         api_shape_name)
     args = [attr_shape_name, eval_exist_func]
 

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

@@ -15,6 +15,7 @@
 import numpy as np
 import paddle
 import unittest
+from paddle.jit.dy2static.convert_operators import eval_if_exist_else_none
 
 
 class CallNotExist(paddle.nn.Layer):
@@ -189,5 +190,61 @@ class TestChooseShapeAttrOrApi(unittest.TestCase):
             paddle.shape(x))
 
 
+class TestEvaIfExistElseNone(unittest.TestCase):
+    def test_locals(self):
+        x_shape = [1, 2, 3]
+        self.assertEqual(eval_if_exist_else_none('x_shape', locals()), x_shape)
+
+    def test_globals(self):
+        x_shape = [1, 2, 3]
+
+        def foo():
+            x_shape = [2, 3, 4]
+            self.assertEqual(
+                eval_if_exist_else_none('x_shape', locals()), [2, 3, 4])
+
+        foo()
+
+    def test_invisible_of_func(self):
+        x_shape = [1, 2, 3]
+
+        def foo():
+            x_shape = [2, 3, 4]
+            return x_shape
+
+        self.assertEqual(
+            eval_if_exist_else_none('x_shape', locals()), [1, 2, 3])
+
+    def test_none(self):
+        def foo():
+            x_shape = [2, 3, 4]
+            return x_shape
+
+        self.assertEqual(eval_if_exist_else_none('x_shape', locals()), None)
+
+
+class ShapeLayer(paddle.nn.Layer):
+    def __init__(self):
+        super(ShapeLayer, self).__init__()
+
+    @paddle.jit.to_static(input_spec=[paddle.static.InputSpec(shape=[None, 1])])
+    def forward(self, x):
+        x = paddle.reshape(x, [-1, x.shape[1]])
+        bs = x.shape[0]  # -1
+
+        # for trigger choos_shape_attr_or_api
+        out = paddle.zeros([bs, 1], dtype='float32')
+        return out
+
+
+class TestChooseShapeAttrOrApiWithLayer(unittest.TestCase):
+    def test_tensor_shape(self):
+        x = paddle.zeros(shape=[4, 1], dtype='float32')
+        net = ShapeLayer()
+        out = net(x)
+
+        self.assertTrue(np.array_equal(out.numpy(), x.numpy()))
+
+
 if __name__ == '__main__':
     unittest.main()

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

@@ -484,7 +484,7 @@ class TestOpNumWithTensorShapeInIf1(TestOpNumBasicWithTensorShape):
         self.dygraph_func = dyfunc_with_if_1
 
     def _set_expected_op_num(self):
-        self.expected_op_num = 19
+        self.expected_op_num = 28
         self.expected_shape_op_num = 4
         self.expected_slice_op_num = 2