code: def _sync_pool_config(self, actor_pool_config: ActorPoolConfig):
      # test pool does not create routers, thus can skip this step
      pass
  
file_path: mars/mars/oscar/backends/test/pool.py
imports: import asyncio
  import multiprocessing
  from typing import List, Dict
  from ..config import ActorPoolConfig
  from ..communication import gen_local_address, DummyServer
  from ..mars.pool import MainActorPool, SubActorPool, SubpoolStatus
  from ..pool import ActorPoolType
label_desc: Use image node_id 3 for calling the TestMainActorPool obj's underlying member method code with example usage: obj._sync_pool_config(actor_pool_config) without return types