np.unicode_ => np.str_ (#49975)

Author: kk-2000

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

@@ -41,7 +41,7 @@ def test_constructor_with_args(self):
         self.assertEqual(ST2.name, "ST2")
         self.assertEqual(ST2.shape, shape)
         np.testing.assert_array_equal(
-            ST2.numpy(), np.empty(shape, dtype=np.unicode_)
+            ST2.numpy(), np.empty(shape, dtype=np.str_)
         )
 
         ST3 = core.eager.StringTensor(self.str_arr, "ST3")  # constructor 3
@@ -74,7 +74,7 @@ def test_constructor_with_kwargs(self):
         self.assertEqual(ST1.name, "ST1")
         self.assertEqual(ST1.shape, shape)
         np.testing.assert_array_equal(
-            ST1.numpy(), np.empty(shape, dtype=np.unicode_)
+            ST1.numpy(), np.empty(shape, dtype=np.str_)
         )
 
         ST2 = core.eager.StringTensor(self.str_arr, name="ST2")  # constructor 3