class_docstr: Librispeech dataset.
class_docstr_tok: ["Librispeech","dataset","."]
code: def _info(self):
      return self.dataset_info_from_configs(
          features=tfds.features.FeaturesDict(
              {
                  "speech": tfds.features.Audio(
                      sample_rate=16000,
                      dtype=np.int16,
                      lazy_decode=self.builder_config.lazy_decode,
                      file_format="flac",
                  ),
                  "text": tfds.features.Text(),
                  "speaker_id": np.int64,
                  "chapter_id": np.int64,
                  "id": np.str_,
              }
          ),
          supervised_keys=("speech", "text"),
          homepage=_URL,
          metadata=tfds.core.MetadataDict(
              sample_rate=16000,
          ),
      )
  
file_path: datasets/tensorflow_datasets/datasets/librispeech/librispeech_dataset_builder.py
imports: from __future__ import annotations
  import os
  from typing import Iterable, List
  from etils import epath
  import numpy
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
  import tensorflow_datasets.public_api
label_desc: Use image node_id 1 for calling the Builder obj's underlying member method code with example usage: obj._info() and returns: self