Polish code

test=develop

python/paddle/dataset/image.py

@@ -34,12 +34,13 @@ from __future__ import print_function
 
 import six
 import numpy as np
-# NOTE(minqiyang): this is an ugly fix for the numpy bug reported here
+# FIXME(minqiyang): this is an ugly fix for the numpy bug reported here
 # https://github.com/numpy/numpy/issues/12497
 if six.PY3:
     import subprocess
     import sys
-    import_cv2_proc = subprocess.Popen([sys.executable, "-c", "import cv2"],
+    import_cv2_proc = subprocess.Popen(
+        [sys.executable, "-c", "import cv2"],
         stdout=subprocess.PIPE,
         stderr=subprocess.PIPE)
     out, err = import_cv2_proc.communicate()