diff --git a/models/rank/dien/model.py b/models/rank/dien/model.py
index 0a2d1c7f6b18158492ed5c739203da39c5181f49..74dc97fc4b648fa1d4545520c1033174e44b797e 100755
--- a/models/rank/dien/model.py
+++ b/models/rank/dien/model.py
@@ -230,7 +230,7 @@ class Model(ModelBase):
                                                    pad_value)
         seq_shape = fluid.layers.shape(pos_seq_pad)
         
-        if(seq_shape[1] < 2):
+        if seq_shape[1] < 2:
             aux_loss = 0
         else:
             test_pos = fluid.layers.reduce_sum(