docstr: Returns the available explanation masks.
docstr_tok: ["Returns","the","available","explanation","masks","."]
code: def available_explanations(self) -> List[str]:
      """Returns the available explanation masks."""
      return [key for key in self.keys() if key.endswith("_mask")]
  
imports: import copy
  from typing import Dict, List, Optional, Union
  import torch
  from torch import Tensor
  from torch_geometric.data.data import Data, warn_or_raise
  from torch_geometric.data.hetero_data import HeteroData
  from torch_geometric.explain.config import ThresholdConfig, ThresholdType
  from torch_geometric.typing import EdgeType, NodeType
  from torch_geometric.visualization import visualize_graph
label_desc: Use image node_id 1 for calling the ExplanationMixin obj's underlying member method code with example usage: obj.available_explanations() and returns: unknown