code: def __next__(self):
      # Check if master iterator received stop signal.
      ctrl_msg = self.communicator.bcast(None, root=self.rank_master)
      (
          stop,
          is_valid_data_type,
          is_paired_dataset,
          self.is_new_epoch,
          self.current_position,
      ) = _parse_ctrl_msg(ctrl_msg)
  
      if self.is_new_epoch:
          self.epoch += 1
  
      if stop:
          raise StopIteration
      elif not is_valid_data_type:
          raise TypeError(
              "Multi node iterator supports ndarray "
              "or tuple of scalars as the data type "
              "of the batch element only."
          )
      if is_paired_dataset:
          xs = self.communicator.bcast(None, root=self.rank_master)
          ys = self.communicator.bcast(None, root=self.rank_master)
          return list(zip(xs, ys.astype(numpy.int32)))
      else:
          batch = self.communicator.bcast(None, root=self.rank_master)
          return batch.tolist()
  
imports: import chainer
  import numpy
label_desc: Use image node_id 2 for calling the _MultiNodeIteratorSlave obj's underlying member method code with example usage: obj.__next__() and returns: list, batch