fix a typo

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