Update build_imagenet_data.py

research/inception/inception/data/build_imagenet_data.py

@@ -171,7 +171,7 @@ def _float_feature(value):
 
 def _bytes_feature(value):
   """Wrapper for inserting bytes features into Example proto."""
-  if isinstance(value, six.string_types):           
+  if six.PY3 and isinstance(value, six.text_type):           
     value = six.binary_type(value, encoding='utf-8') 
   return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))