code: def stop(self):
      self._stopping = True
      self._logger.debug(
          f"calling stop, canceling {len(self._tasks)} tasks"
      )
      for task in self._tasks:
          task.cancel()
  
      # This will block the stop() function until all futures are cancelled
      # if _wait_after_cancel=True. When _wait_after_cancel=False, it will still
      # wait for any in-progress futures.
      # See: https://docs.python.org/3.8/library/concurrent.futures.html
      self._executor.shutdown(wait=self._wait_after_cancel)
      self._stopped = True
  
imports: import asyncio
  import sys
  from copy import deepcopy
  from collections import defaultdict
  import concurrent.futures
  from dataclasses import dataclass, field
  import logging
  import numpy
  import pprint
  import time
  import traceback
  from typing import Callable, Dict, List, Optional, Tuple, Union
  from ray.util.state import list_tasks
  import ray
  from ray.actor import ActorHandle
  from ray.util.state import list_workers
  from ray._private.gcs_utils import GcsAioClient, GcsChannel
  from ray.util.state.state_manager import StateDataSourceClient
  from ray.dashboard.state_aggregator import StateAPIManager
label_desc: Use image node_id 5 for calling the StateAPIGeneratorActor obj's underlying member method code with example usage: obj.stop() without return types