code: def __reduce__(self):
      remote_obj = self.get_remote_obj()
      if remote_obj is None:
          return (self.__class__, (self.client_id, self.id))
      return (identity, (remote_obj,))
  
file_path: ray/python/ray/util/client/server/server_stubs.py
imports: from contextlib import contextmanager
  from abc import ABC
  from abc import abstractmethod
label_desc: Use image node_id 2 for calling the ClientReferenceSentinel obj's underlying member method code with example usage: obj.__reduce__() and returns: identity,  remote_obj, self,  self,  self