class_docstr: A wrapper for RPC calls to the feature store.
code: def rpc_sync(self, *args, **kwargs):
      raise NotImplementedError
  
imports: import copy
  import json
  import os.path
  from dataclasses import dataclass
  from typing import Any, Dict, List, Optional, Tuple, Union
  import torch
  from torch import Tensor
  from torch_geometric.data import FeatureStore, TensorAttr
  from torch_geometric.data.feature_store import _FieldStatus
  from torch_geometric.distributed.rpc import RPCCallBase, RPCRouter, rpc_async, rpc_register
  from torch_geometric.typing import EdgeType, NodeOrEdgeType, NodeType
label_desc: Use image node_id 3 for calling the RPCCallFeatureLookup obj's underlying member method code with example usage: obj.rpc_sync() without return types