diff --git a/tensorflow/python/layers/core.py b/tensorflow/python/layers/core.py
index 95adac94235..4eecf9c9a16 100644
--- a/tensorflow/python/layers/core.py
+++ b/tensorflow/python/layers/core.py
@@ -22,6 +22,11 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
+
+import six
+from six.moves import xrange  # pylint: disable=redefined-builtin
+import numpy as np
+
 from tensorflow.python.eager import context
 from tensorflow.python.framework import ops
 from tensorflow.python.framework import tensor_shape