class_docstr: An abstract base class for implementing explainer algorithms.
code: def __repr__(self) -> str:
      return f"{self.__class__.__name__}()"
  
imports: from abc import abstractmethod
  from typing import Dict, Optional, Tuple, Union
  import torch
  import torch.nn.functional
  from torch import Tensor
  from torch_geometric.explain import Explanation, HeteroExplanation
  from torch_geometric.explain.config import ExplainerConfig, ModelConfig, ModelReturnType
  from torch_geometric.nn import MessagePassing
  from torch_geometric.typing import EdgeType, NodeType
  from torch_geometric.utils import k_hop_subgraph
label_desc: Use image node_id 13 for calling the ExplainerAlgorithm obj's underlying member method code with example usage: obj.__repr__() and returns: self, str