code: def process(self):
      self.save(self.data_list, self.processed_paths[0])
  
imports: import copy
  import pytest
  import torch
  from torch_geometric import EdgeIndex
  from torch_geometric.data import Data, HeteroData, InMemoryDataset
  from torch_geometric.datasets import KarateClub
  from torch_geometric.testing import withPackage
  from torch_geometric.transforms import BaseTransform
  from torch_geometric.typing import SparseTensor
label_desc: Use image node_id 3 for calling the MyStoredTestDataset obj's underlying member method code with example usage: obj.process() without return types