code: def test_multinode_autoload():
      n = 3
      with tempfile.TemporaryDirectory() as tempd:
          result = tempd
          updater0, snapshot, trainer0 = _prepare_multinode_snapshot(
              n, result
          )
  
          assert n == updater0.iteration
          snapshot(trainer0)
  
          updater, _, _ = _prepare_multinode_snapshot(0, result)
  
          assert n == updater.iteration
  
imports: import mock
  import tempfile
  import pytest
  import chainer
  import chainer.links
  import chainer.functions
  from chainer.training import extensions
  from chainer.training import StandardUpdater
  from chainer.training import Trainer
  import chainermn
  from chainermn import create_communicator
  from chainermn.extensions import multi_node_snapshot
  from chainermn.extensions import _multi_node_snapshot
label_desc: Use image node_id 6 for calling a global function with example usage: test_multinode_autoload() without return types