code: def setUp(self):
      self.tempdir = utils.tempdir()
      dirpath = self.tempdir.__enter__()
      self.path = os.path.join(dirpath, "test.pkl")
  
imports: import ctypes
  import io
  import multiprocessing
  import os
  import pickle
  import platform
  import sys
  import unittest
  import mock
  from chainer import datasets
  from chainer.datasets import pickle_dataset
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 1 for calling the TestPickleDatasetHelper obj's underlying member method code with example usage: obj.setUp() without return types