code: def get_value(self, key: Optional[NodeType] = None) -> Optional[int]:
      if self.value is None or isinstance(self.value, int):
          return self.value
      assert isinstance(key, str)
      return self.value[key]
  
imports: from abc import ABC, abstractmethod
  from dataclasses import dataclass
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import torch
  import torch.nn.functional
  from torch_geometric.data import Data, HeteroData
  from torch_geometric.data.datapipes import functional_transform
  from torch_geometric.data.storage import EdgeStorage, NodeStorage
  from torch_geometric.transforms import BaseTransform
  from torch_geometric.typing import EdgeType, NodeType
label_desc: Use image node_id 2 for calling the _NumNodes obj's underlying member method code with example usage: obj.get_value(key) and returns: self, self