class_docstr: A wrapper base class for RPC calls in remote processes.
code: def rpc_async(self, *args, **kwargs):
      pass
  
imports: import logging
  import threading
  from abc import ABC, abstractmethod
  from typing import Any, Callable, Dict, List, Optional
  from torch.distributed import rpc
  from torch_geometric.distributed.dist_context import DistContext, DistRole
label_desc: Use image node_id 2 for calling the RPCCallBase obj's underlying member method code with example usage: obj.rpc_async() without return types