[API]Support is_tensor() static branch (#50520)

python/paddle/fluid/tests/unittests/test_is_tensor.py

@@ -20,24 +20,43 @@ DELTA = 0.00001
 
 
 class TestIsTensorApi(unittest.TestCase):
+    def setUp(self):
+        paddle.disable_static()
+
+    def tearDown(self):
+        paddle.enable_static()
+
     def test_is_tensor_real(self, dtype="float32"):
         """Test is_tensor api with a real tensor"""
-        paddle.disable_static()
         x = paddle.rand([3, 2, 4], dtype=dtype)
         self.assertTrue(paddle.is_tensor(x))
 
     def test_is_tensor_list(self, dtype="float32"):
         """Test is_tensor api with a list"""
-        paddle.disable_static()
         x = [1, 2, 3]
         self.assertFalse(paddle.is_tensor(x))
 
     def test_is_tensor_number(self, dtype="float32"):
         """Test is_tensor api with a number"""
-        paddle.disable_static()
         x = 5
         self.assertFalse(paddle.is_tensor(x))
 
 
+class TestIsTensorStatic(unittest.TestCase):
+    def setUp(self):
+        paddle.enable_static()
+
+    def tearDown(self):
+        paddle.disable_static()
+
+    def test_is_tensor(self):
+        x = paddle.rand([3, 2, 4], dtype='float32')
+        self.assertTrue(paddle.is_tensor(x))
+
+    def test_is_tensor_array(self):
+        x = paddle.tensor.create_array('float32')
+        self.assertTrue(paddle.is_tensor(x))
+
+
 if __name__ == '__main__':
     unittest.main()

python/paddle/tensor/logic.py

@@ -779,7 +779,10 @@ def is_tensor(x):
             print(check)  #False
 
     """
-    return isinstance(x, (Tensor, paddle.fluid.core.eager.Tensor))
+    if in_dygraph_mode():
+        return isinstance(x, (Tensor, paddle.fluid.core.eager.Tensor))
+    else:
+        return isinstance(x, Variable)
 
 
 def _bitwise_op(op_name, x, y, out=None, name=None, binary_op=True):