diff --git a/dssm/network_conf.py b/dssm/network_conf.py
index 7be413fcc0d2c41d318015e580741333403e40ff..996e91ae1e8daf0b7f52f7dae8dfdfef78dfabc7 100644
--- a/dssm/network_conf.py
+++ b/dssm/network_conf.py
@@ -102,8 +102,7 @@ class DSSM(object):
         '''
         A GRU sentence vector learner.
         '''
-        gru = paddle.networks.simple_gru(
-            input=emb, size=256)
+        gru = paddle.networks.simple_gru(input=emb, size=256)
         sent_vec = paddle.layer.last_seq(gru)
         return sent_vec