code: def download_data(gzfile, url):
      if os.path.exists(gzfile):
          print("Downloaded already!")
          sys.exit(0)
      print("Downloading data %s" % (url))
      ul_request.urlretrieve(url, gzfile)
      print("Finished!")
  
file_path: singa/examples/gan/utils.py
imports: import gzip
  import matplotlib.pyplot
  import numpy
  import os
  import pickle
  import sys
  import time
label_desc: Use image node_id 3 for calling a global function with example usage: download_data(gzfile, url) without return types