code: def voc():
      # TODO: Also test the "2007-test" key
      return itertools.chain.from_iterable(
          [
              collect_urls(
                  datasets.VOCSegmentation,
                  ROOT,
                  year=year,
                  download=True,
              )
              for year in (
                  "2007",
                  "2008",
                  "2009",
                  "2010",
                  "2011",
                  "2012",
              )
          ]
      )
  
imports: import contextlib
  import itertools
  import tempfile
  import time
  import traceback
  import unittest.mock
  import warnings
  from datetime import datetime
  from distutils import dir_util
  from os import path
  from urllib.error import HTTPError, URLError
  from urllib.parse import urlparse
  from urllib.request import Request, urlopen
  import pytest
  from torchvision import datasets
  from torchvision.datasets.utils import _get_redirect_url, USER_AGENT
label_desc: Use image node_id 14 for calling a global function with example usage: voc() and returns: itertools