code: def __init__(self, io_):
      self.io = io_
      self._lock = multiprocessing.RLock()
      self._hook_called = multiprocessing.Value(
          ctypes.c_int, 0, lock=False
      )
      self._last_caller_pid = multiprocessing.Value(
          ctypes.c_int, -1, lock=False
      )
  
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 to create a new ReaderMock object from inherited base classes: object with example: obj = ReaderMock(io_)