code: def _put_edge_index(
      self,
      edge_index: EdgeTensorType,
      edge_attr: EdgeAttr,
  ) -> bool:
      self.store[self.key(edge_attr)] = edge_index
      return True
  
file_path: pytorch_geometric/torch_geometric/testing/graph_store.py
imports: from typing import Dict, List, Optional, Tuple
  from torch import Tensor
  from torch_geometric.data import EdgeAttr, GraphStore
  from torch_geometric.typing import EdgeTensorType
label_desc: Use image node_id 3 for calling the MyGraphStore obj's underlying member method code with example usage: obj._put_edge_index(edge_index, edge_attr) and returns: True