code: def test_not_source_token_parallel_iter(
      source_iterables, target_iterables
  ):
      with pytest.raises(SockeyeError) as e:
          list(
              data_io.parallel_iter(source_iterables, target_iterables)
          )
      assert str(e.value).startswith(
          "Source sequences are not token-parallel"
      )
  
imports: import os
  import random
  from tempfile import TemporaryDirectory
  from typing import Optional, List, Tuple
  import numpy
  import pytest
  import torch
  from sockeye import constants
  from sockeye import data_io
  from sockeye import utils
  from sockeye import vocab
  from sockeye.test_utils import tmp_digits_dataset
  from sockeye.utils import SockeyeError, get_tokens, seed_rngs
label_desc: Use image node_id 8 for calling a global function with example usage: test_not_source_token_parallel_iter(source_iterables, target_iterables) without return types