code: def _check_teardown():
      assert _nest_count == 0, (
          "_setup_random() and _teardown_random() "
          "must be called in pairs."
      )
  
imports: from __future__ import absolute_import
  import atexit
  import functools
  import os
  import random
  import types
  import numpy
  from chainer.backends import cuda
  from chainer.testing import _bundle
label_desc: Use image node_id 6 for calling a global function with example usage: _check_teardown() without return types