message: Python 2/3 compatible download_model_binary.py
diff: @@ -3,10 +3,11 @@ import os
  import sys
  import time
  import yaml
  -import urllib
  import hashlib
  import argparse
  +from six.moves import urllib
  +
  required_keys = ['caffemodel', 'caffemodel_url', 'sha1']
  @@ -69,7 +70,7 @@ if __name__ == '__main__':
  sys.exit(0)
  # Download and verify model.
  - urllib.urlretrieve(
  + urllib.request.urlretrieve(
  frontmatter['caffemodel_url'], model_filename, reporthook)
  if not model_checks_out():
  print('ERROR: model did not download correctly! Run this again.')
  