docstr: Find the associated chunk metadata.
docstr_tok: ["Find","the","associated","chunk","metadata","."]
code: def __getitem__(self, index: ChunkedIndex) -> Tuple[str, int, int]:
      """Find the associated chunk metadata."""
      chunk = self._chunks[index.chunk_index]
      return (
          os.path.join(self._cache_dir, chunk["filename"]),
          *self._intervals[index.chunk_index],
      )
  
imports: import json
  import os
  from typing import Any, Dict, List, Optional, Tuple
  from lightning.data.streaming.constants import _INDEX_FILENAME, _TORCH_GREATER_EQUAL_2_1_0
  from lightning.data.streaming.downloader import get_downloader_cls
  from lightning.data.streaming.item_loader import BaseItemLoader, PyTreeLoader, TokensLoader
  from lightning.data.streaming.sampler import ChunkedIndex
  from lightning.data.streaming.serializers import Serializer
label_desc: Use image node_id 11 for calling the ChunksConfig obj's underlying member method code with example usage: obj.__getitem__(index) and returns: os,  unknown