code: def stop(self, wait=False, timeout=0):
      # stop isolation
      stop_isolation()
  
      from kubernetes.client import CoreV1Api
  
      api = CoreV1Api(self._api_client)
      api.delete_namespace(self._namespace)
      if wait:
          start_time = time.time()
          while True:
              try:
                  api.read_namespace(self._namespace)
              except K8SApiException as ex:
                  if ex.status != 404:  # pragma: no cover
                      raise
                  break
              else:
                  time.sleep(1)
                  if (
                      timeout and time.time() - start_time > timeout
                  ):  # pragma: no cover
                      raise TimeoutError
  
imports: import asyncio
  import functools
  import logging
  import random
  import time
  import uuid
  from urllib.parse import urlparse
  from ...lib.aio import new_isolation, stop_isolation
  from ...services.cluster.api import WebClusterAPI
  from ...session import new_session
  from ...utils import calc_size_by_str
  from ..utils import wait_services_ready
  from .config import NamespaceConfig, RoleConfig, RoleBindingConfig, ServiceConfig, MarsSupervisorsConfig, MarsWorkersConfig
label_desc: Use image node_id 16 for calling the KubernetesCluster obj's underlying member method code with example usage: obj.stop(wait, timeout) without return types