fix a error

Author: JiayiFeng

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

@@ -336,8 +336,6 @@ def find_actual(target_name, fetch_list):
                 actual_t = np.array(actual)
                 expect = self.outputs[out_name]
                 expect_t = expect[0] if isinstance(expect, tuple) else expect
-                import pdb
-                pdb.set_trace()
                 self.assertTrue(
                     np.allclose(
                         actual_t, expect_t, atol=atol),