code: def dummy_source(batches):
      def inner():
          while True:
              for batch in batches:
                  yield batch
  
      return inner
  
imports: import os
  import random
  import numpy
  from typing import List, Union, Callable, Optional
  from dataclasses import dataclass, field
  from nvidia.dali import pipeline_def
  import nvidia.dali.fn
  from nvidia.dali import types
  import nvidia.dali.tensors
  from test_utils import get_dali_extra_path, check_batch
label_desc: Use image node_id 3 for calling a global function with example usage: dummy_source(batches) and returns: inner