code: def __init__(self, address):
      self.address = address
      self.server = None
  
file_path: mars/mars/oscar/backends/ray/tests/test_communication.py
imports: import asyncio
  import inspect
  import pytest
  from .....tests.core import require_ray
  from .....utils import ensure_coverage, lazy_import
  from ....core import ActorRef
  from ....errors import ServerClosed
  from ...communication.base import ChannelType
  from ...message import SendMessage
  from ..communication import ChannelID, Channel, RayServer, RayClient, msg_to_simple_str
label_desc: Use image node_id 2 to create a new ServerActor object  with example: obj = ServerActor(address)