code: def lsun_categories(tag):
      """
      Query LSUN_URL and return a list of LSUN categories
  
      Argument:
          tag (str): version tag, use "latest" for most recent
      """
      f = urlopen(LSUN_URL + "list.cgi?tag=" + tag)
      return json.loads(f.read())
  
file_path: neon/examples/gan/lsun_data.py
imports: import numpy
  import os
  import shutil
  import subprocess
  import json
  import zipfile
  import logging
  from tqdm import tqdm
  from PIL import Image
  from neon.data.aeon_shim import AeonDataLoader
  from neon.data.dataloader_transformers import OneHot, TypeCast, ValueNormalize
  from neon.util.persist import get_data_cache_or_nothing
  from future import standard_library
  from future.moves.urllib.request import urlopen
label_desc: Use image node_id 1 for calling a global function with example usage: lsun_categories(tag) and returns: json