code: def setup_rcv1():
      check_skip_network()
      # skip the test in rcv1.rst if the dataset is not already loaded
      rcv1_dir = join(get_data_home(), "RCV1")
      if not exists(rcv1_dir):
          raise SkipTest("Download RCV1 dataset to run this test.")
  
imports: import os
  import warnings
  from os import environ
  from os.path import exists, join
  import pytest
  from _pytest.doctest import DoctestItem
  from sklearn.datasets import get_data_home
  from sklearn.datasets._base import _pkl_filepath
  from sklearn.datasets._twenty_newsgroups import CACHE_NAME
  from sklearn.utils import IS_PYPY
  from sklearn.utils._testing import SkipTest, check_skip_network
  from sklearn.utils.fixes import np_base_version, parse_version
label_desc: Use image node_id 2 for calling a global function with example usage: setup_rcv1() without return types