diff --git a/python/paddle/fluid/trainer.py b/python/paddle/fluid/trainer.py
index 0272b8b586b22a43776479a0cf1ea10c00381cc9..64049a93cb0a267722de9cd94961b6256551330d 100644
--- a/python/paddle/fluid/trainer.py
+++ b/python/paddle/fluid/trainer.py
@@ -348,7 +348,8 @@ class Trainer(object):
         training_role = os.getenv("PADDLE_TRAINING_ROLE")
         with self._prog_and_scope_guard():
             t = distribute_transpiler.DistributeTranspiler()
-            t.transpile(self.trainer_id, pservers=pserver_endpoints, trainers=trainers)
+            t.transpile(
+                self.trainer_id, pservers=pserver_endpoints, trainers=trainers)
             if training_role == "PSERVER":
                 if self.checkpoint_cfg:
                     pserver_id = eplist.index(current_endpoint)