code: def processed_file_names(self) -> List[str]:
      return [self.name + ".npz"]
  
imports: import copy
  import os
  import os.path
  from dataclasses import dataclass
  from functools import cached_property
  from glob import glob
  from pathlib import Path
  from typing import Callable, List, MutableSequence, Optional, Tuple, Union
  import numpy
  import torch
  from torch.utils.data import ConcatDataset, Subset
  from torch_geometric.data import Data, InMemoryDataset, download_url, extract_zip
  from torch_geometric.data.data import BaseData
label_desc: Use image node_id 3 for calling the Partition obj's underlying member method code with example usage: obj.processed_file_names() and returns: list