diff --git a/dmlc-core b/dmlc-core
index 35c7762164cd..b9d440f926e9 160000
--- a/dmlc-core
+++ b/dmlc-core
@@ -1 +1 @@
-Subproject commit 35c7762164cd19379d03ec403008af3a228c15f9
+Subproject commit b9d440f926e905122036e0b6f942148110a655bb
diff --git a/python/mxnet/visualization.py b/python/mxnet/visualization.py
index f37031464e34..bef3aa0d83c0 100644
--- a/python/mxnet/visualization.py
+++ b/python/mxnet/visualization.py
@@ -1,6 +1,7 @@
 # coding: utf-8
 # pylint: disable=invalid-name, protected-access, too-many-locals, fixme
 # pylint: disable=unused-argument, too-many-branches, too-many-statements
+# pylint: disable=unused-variable
 """Visualization module"""
 from __future__ import absolute_import