code: def test_serialization(ray_start_regular_shared):
      it = (
          from_items([1, 2, 3, 4])
          .gather_sync()
          .for_each(lambda x: x)
          .filter(lambda x: True)
          .batch(2)
          .flatten()
      )
      assert (
          repr(it) == "LocalIterator[ParallelIterator["
          "from_items[int, 4, shards=2]].gather_sync()."
          "for_each().filter().batch(2).flatten()]"
      )
  
      @ray.remote
      def get(it):
          return list(it)
  
      assert ray.get(get.remote(it)) == [1, 2, 3, 4]
  
imports: import sys
  import time
  import collections
  from collections import Counter
  import pytest
  import ray
  from ray.util.iter import from_items, from_iterators, from_range, from_actors, ParallelIteratorWorker, LocalIterator
  from ray._private.test_utils import Semaphore
label_desc: Use image node_id 35 for calling a global function with example usage: test_serialization(ray_start_regular_shared) and returns: list