code: def callback_test_helper(args):
      """
      This is a helper function for the test_callbacks test. It must be placed
      outside the test because Python's Multiprocessing library uses Pickle to
      serialize functions, but Pickle cannot serialize local functions.
      """
      time.sleep(0.1 * random.random())
      index = args[0]
      err_indices = args[1]
      if index in err_indices:
          raise Exception("intentional failure")
      return index
  
imports: import os
  import sys
  import platform
  import pytest
  import tempfile
  import time
  import random
  from collections import defaultdict
  import queue
  import math
  import ray
  from ray._private.test_utils import SignalActor
  from ray.util.multiprocessing import Pool, TimeoutError, JoinableQueue
  from ray.util.joblib import register_ray
  from joblib import parallel_backend, Parallel, delayed
label_desc: Use image node_id 18 for calling a global function with example usage: callback_test_helper(args) and returns: index