code: def __reduce__(self):
      return (
          type(self),
          (
              self._node_role,
              self._pool_address,
              self._k8s_config,
              self._k8s_namespace,
          ),
      )
  
file_path: mars/mars/deploy/kubernetes/core.py
imports: import asyncio
  import logging
  import os
  from typing import AsyncGenerator, Dict, List, Optional, TypeVar
  from ...services.cluster import WebClusterAPI
  from ...services.cluster.backends import register_cluster_backend, AbstractClusterBackend
  from ...services.cluster.core import NodeRole
  from ..utils import wait_all_supervisors_ready, next_in_thread
  from .config import MarsReplicationConfig
label_desc: Use image node_id 2 for calling the K8SClusterBackend obj's underlying member method code with example usage: obj.__reduce__() and returns: type,  self,  self,  self,  self