code: def tearDown(self):
      self.tempdir.__exit__(*sys.exc_info())
  
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 2 for calling the TestPickleDatasetHelper obj's underlying member method code with example usage: obj.tearDown() without return types