class_docstr: An abstract class for specifying different padding values.
class_docstr_tok: ["An","abstract","class","for","specifying","different","padding","values","."]
code: def validate_key_value(self, key: Any, value: Any) -> None:
      pass
  
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 MappingPadding obj's underlying member method code with example usage: obj.validate_key_value(key, value) without return types