class_docstr: Add indexing features to `datasets.Dataset`
class_docstr_tok: ["Add","indexing","features","to","`","datasets.Dataset","`"]
code: def __getitem__(self, key):
      raise NotImplementedError
  
imports: import importlib.util
  import os
  import tempfile
  from pathlib import PurePath
  from typing import TYPE_CHECKING, Dict, List, NamedTuple, Optional, Union
  import fsspec
  import numpy
  from .utils import logging
  from .utils import tqdm
label_desc: Use image node_id 3 for calling the IndexableMixin obj's underlying member method code with example usage: obj.__getitem__(key) without return types