diff --git a/python/paddle/fluid/io.py b/python/paddle/fluid/io.py
index 62e3046db648689d6e197e156f829fa6d7bf5862..75146fe3269ad2a799d8a8676e56cf4567b957f1 100644
--- a/python/paddle/fluid/io.py
+++ b/python/paddle/fluid/io.py
@@ -639,13 +639,14 @@ def _is_checkpoint_var(var):
             var.desc.type() == core.VarDesc.VarType.FETCH_LIST or \
             var.desc.type() == core.VarDesc.VarType.RAW:
         return False
-
+    # @GRAD are named for gradient varibales, checkpoint will not save it.
     if "@GRAD" in var.name:
         return False
-
+    # .trainer_ are named for distribute trian variables, checkpoint will not save it.
     if ".trainer_" in var.name:
         return False
 
+    # .block is named for distribute trian variables, checkpoint will not save it.
     if ".block" in var.name:
         return False
 
diff --git a/tools/codestyle/docstring_checker.pyc b/tools/codestyle/docstring_checker.pyc
index 1f0255b763c8d154b7cc17d2d525148dfea3b42d..a27d3c9a8cccab8552d510578debb2df04eb53bb 100644
Binary files a/tools/codestyle/docstring_checker.pyc and b/tools/codestyle/docstring_checker.pyc differ