code: def paper_year(self) -> np.ndarray:
      path = osp.join(self.dir, "processed", "paper", "node_year.npy")
      return np.load(path, mmap_mode="r")
  
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 14 for calling the MAG240MDataset obj's underlying member method code with example usage: obj.paper_year() and returns: np