code: def stop_server(self):
      self._client.stop_server()
  
imports: import os
  import sys
  import time
  import argparse
  import warnings
  import numpy
  from functools import partial
  from paddle.framework import core
  from pgl.utils.logger import log
  from pgl.distributed import helper
label_desc: Use image node_id 10 for calling the DistGraphClient obj's underlying member method code with example usage: obj.stop_server() without return types