Complex op test (#29753)

* delete no need to calculate inputs in dygraph op_test

* delete no need to calculate inputs in dygraph op_test

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

@@ -1544,6 +1544,10 @@ class OpTest(unittest.TestCase):
                 grad_outputs = []
                 for grad_out_value in user_defined_grad_outputs:
                     grad_outputs.append(paddle.to_tensor(grad_out_value))
+                # delete the inputs which no need to calculate grad
+                for no_grad_val in no_grad_set:
+                    del (inputs[no_grad_val])
+
                 grad_inputs = paddle.grad(
                     outputs=fluid.layers.utils.flatten(outputs),
                     inputs=fluid.layers.utils.flatten(inputs),