diff --git a/python/paddle/fluid/tests/unittests/test_sampling_id_op.py b/python/paddle/fluid/tests/unittests/test_sampling_id_op.py
index 981958ee0893b3f3eac803f242fdca624860dcf8..674ef2ddf44edb4246c9d952cb75b36fe3d6ddc8 100644
--- a/python/paddle/fluid/tests/unittests/test_sampling_id_op.py
+++ b/python/paddle/fluid/tests/unittests/test_sampling_id_op.py
@@ -36,7 +36,7 @@ class TestSamplingIdOp(OpTest):
         y1 = self.out
         self.check_output_customized(self.verify_output)
         y2 = self.out
-        
+
         # check dtype
         assert y1.dtype == np.int64
         assert y2.dtype == np.int64