code: def batch_test(num_threads, delay):
      """Run AWSNodeProvider.set_node_tags in several threads, with a
      specified delay between thread launches.
  
      Return the number of batches of tag updates and the number of tags
      updated.
      """
      with mock.patch(
          "ray.autoscaler._private.aws.node_provider.make_ec2_resource"
      ), mock.patch.object(
          AWSNodeProvider, "_create_tags", mock_create_tags
      ):
          provider = AWSNodeProvider(
              provider_config={"region": "nowhere"},
              cluster_name="default",
          )
          provider.batch_counter = 0
          provider.tag_update_counter = 0
          provider.tag_cache = {str(x): {} for x in range(num_threads)}
  
          threads = []
          for x in range(num_threads):
              thread = threading.Thread(
                  target=provider.set_node_tags,
                  args=(str(x), {"foo": "bar"}),
              )
              threads.append(thread)
  
          for thread in threads:
              thread.start()
              time.sleep(delay)
          for thread in threads:
              thread.join()
  
          return provider.batch_counter, provider.tag_update_counter
  
file_path: ray/python/ray/tests/aws/test_aws_batch_tag_update.py
imports: import threading
  import time
  import unittest
  from unittest import mock
  import pytest
  from ray.autoscaler._private.aws.node_provider import AWSNodeProvider
  from ray.autoscaler._private.aws.node_provider import TAG_BATCH_DELAY
label_desc: Use image node_id 2 for calling a global function with example usage: batch_test(num_threads, delay) and returns: provider,  provider