code: def test_mn_iterator_no_repeat(self):
      # Do not repeat iterator to test if we can catch StopIteration.
      bs = 4
      iterator = chainermn.iterators.create_multi_node_iterator(
          self.iterator_class(
              self.dataset, batch_size=bs, shuffle=True, repeat=False
          ),
          self.communicator,
      )
  
      for e in range(3):
          try:
              while True:
                  batch = iterator.next()
                  if self.communicator.rank == 0:
                      for rank_from in range(1, self.communicator.size):
                          _batch = self.communicator.mpi_comm.recv(
                              source=rank_from
                          )
                          self.assertEqual(batch, _batch)
                  else:
                      self.communicator.mpi_comm.ssend(batch, dest=0)
          except StopIteration:
              continue
  
imports: import chainer
  import chainer.testing
  import chainer.testing.attr
  import chainermn
  from chainermn.iterators.multi_node_iterator import _build_ctrl_msg
  from chainermn.iterators.multi_node_iterator import _parse_ctrl_msg
  import numpy
  import platform
  import pytest
  from six.moves import range
  import unittest
label_desc: Use image node_id 5 for calling the TestMultiNodeIterator obj's underlying member method code with example usage: obj.test_mn_iterator_no_repeat() without return types