code: def get_idx_split(
      self, split: Optional[str] = None
  ) -> Union[Dict[str, np.ndarray], np.ndarray]:
      return self.__split__ if split is None else self.__split__[split]
  
imports: from typing import Optional, Union, Dict
  import os
  import shutil
  import os.path
  import torch
  import numpy
  from ogb.utils.url import decide_download, download_url, extract_zip, makedirs
  from ogb.lsc.utils import split_test
label_desc: Use image node_id 9 for calling the MAG240MDataset obj's underlying member method code with example usage: obj.get_idx_split(split) and returns: unknown