code: def _load(self) -> None:
      if self.is_loaded:
          return None
  
      with np.load(self.processed_paths[0]) as npzfile:
          self.z = npzfile["z"]
          self.pos = npzfile["pos"]
          self.y = npzfile["y"]
          numel = int(npzfile["num_graphs"])
  
      self._data_list: MutableSequence[Optional[BaseData]] = [
          None
      ] * numel
      self.is_loaded = True
  
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 5 for calling the Partition obj's underlying member method code with example usage: obj._load() and returns: None