code: def download():
      print("Downloading " + FILE_URI)
      tar_filename, _ = urllib.request.urlretrieve(FILE_URI)
      print("Unpacking " + tar_filename)
      with tarfile.open(tar_filename, "r:gz") as tar:
          tar.extractall(DATA_DIR)
      print("Done!")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from six.moves import urllib
  import os
  import tarfile
label_desc: Use image node_id 1 for calling a global function with example usage: download() without return types