code: def clear(cls):
      cls._server_instance = None
      cls._ray_actor_started = False
  
imports: import asyncio
  import concurrent.futures
  import itertools
  import logging
  import time
  from abc import ABC
  from collections import namedtuple
  from dataclasses import dataclass
  from typing import Any, Callable, Coroutine, Dict, List, Set, Tuple, Type
  from urllib.parse import urlparse
  from ....oscar.profiling import ProfilingData
  from ....serialization import serialize, deserialize
  from ....metrics import Metrics
  from ....utils import lazy_import, lazy_import_on_load, implements, classproperty, Timer
  from ...debug import debug_async_timeout
  from ...errors import ServerClosed
  from ..communication.base import Channel, ChannelType, Server, Client
  from ..communication.core import register_client, register_server
  from ..communication.errors import ChannelClosed
  from .utils import report_event
label_desc: Use image node_id 7 for calling the RayServer obj's underlying member method code with example usage: obj.clear(cls) without return types