code: def __init__(self, n_prefetch, dataset_timeout):
      self.n_prefetch = n_prefetch
      self.dataset_timeout = dataset_timeout
  
      self._lock = threading.Lock()
      self._not_empty_cond = threading.Condition(self._lock)
      self._not_full_cond = threading.Condition(self._lock)
      self._batch_queue = []
      self._status = _Communicator.STATUS_CONTINUE
      self._reset_count = 0
  
imports: from __future__ import division
  import datetime
  import multiprocessing
  from multiprocessing import sharedctypes
  import signal
  import sys
  import threading
  import warnings
  import numpy
  import six
  from chainer.dataset import iterator
  from chainer.iterators import _statemachine
  from chainer.iterators.order_samplers import ShuffleOrderSampler
label_desc: Use image node_id 1 to create a new _Communicator object from inherited base classes: object with example: obj = _Communicator(n_prefetch, dataset_timeout)