code: def dump_extra(self, root: Optional[str] = None) -> None:
      return self._dump_extra(root)
  
imports: from dataclasses import dataclass
  from enum import Enum
  from functools import lru_cache
  from gzip import GzipFile
  from io import BytesIO
  from mmap import ACCESS_READ, mmap
  import os
  from typing import Any, Callable, List, Optional, Set, Tuple
  import warnings
  import numpy
  from .extended import ExtendedVisionDataset
label_desc: Use image node_id 20 for calling the ImageNet22k obj's underlying member method code with example usage: obj.dump_extra(root) and returns: self