diff --git a/dygraph/train.py b/dygraph/train.py
index 752237c97cfef971d5543c7026b34b3b66d16ad8..ba60a5aa7cdef14046f7d6cbafa06603271c7710 100644
--- a/dygraph/train.py
+++ b/dygraph/train.py
@@ -19,7 +19,7 @@ from paddle.distributed import ParallelEnv
 
 import paddleseg
 from paddleseg.cvlibs import manager, Config
-from paddleseg.utils import get_environ_info, logger, 
+from paddleseg.utils import get_environ_info, logger
 from paddleseg.core import train