diff --git a/python/oneflow/test/modules/test_global_higher_derivative_pool.py b/python/oneflow/test/modules/test_global_higher_derivative_pool.py
index 123e9ffd04f..a8991dc5317 100644
--- a/python/oneflow/test/modules/test_global_higher_derivative_pool.py
+++ b/python/oneflow/test/modules/test_global_higher_derivative_pool.py
@@ -116,6 +116,7 @@ def _test_adaptive_pool_grad_grad_impl(test_case, placement, ndim, mode):
     _check_equal(test_case, ddx.pytorch, ddx.oneflow, "ddx")
     _check_equal(test_case, ddy.pytorch, ddy.oneflow, "ddy")
 
+
 @flow.unittest.skip_unless_1n1d()
 class TestGlobalPoolHigherDerivative(flow.unittest.TestCase):
     @globaltest