code: def _get_value(self, scope, key):
      with self.server.cache_lock:
          return self.server.cache.get(scope, {}).get(key)
  
imports: import collections
  import logging
  import socket
  import socketserver
  import threading
  from http.server import HTTPServer, SimpleHTTPRequestHandler
  from horovod.runner.util.network import find_port
  from horovod.runner.util.threads import in_thread
label_desc: Use image node_id 5 for calling the KVStoreHandler obj's underlying member method code with example usage: obj._get_value(scope, key) and returns: self