code: def sleep(self):
      time.sleep(999)
  
imports: import asyncio
  from collections import defaultdict
  import pytest
  import time
  from typing import Dict
  import ray
  from ray.util.state import list_actors
  from ray._private.test_utils import raw_metrics, wait_for_condition, run_string_as_driver
  from ray._private.worker import RayContext
label_desc: Use image node_id 1 for calling the Actor2 obj's underlying member method code with example usage: obj.sleep() without return types