code: def test_parallel_iter(source_iterables, target_iterables, expected):
      assert (
          list(
              data_io.parallel_iter(source_iterables, target_iterables)
          )
          == expected
      )
  
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 10 for calling a global function with example usage: test_parallel_iter(source_iterables, target_iterables, expected) without return types