class_docstr: *LJSpeech-1.1* :cite:`ljspeech17` dataset.
  
  Args:
      root (str or Path): Path to the directory where the dataset is found or downloaded.
      url (str, optional): The URL to download the dataset from.
          (default: ``"https://data.keithito.com/data/speech/LJSpeech-1.1.tar.bz2"``)
      folder_in_archive (str, optional):
          The top-level directory of the dataset. (default: ``"wavs"``)
      download (bool, optional):
          Whether to download the dataset if it is not found at root path. (default: ``False``).
class_docstr_tok: ["*","LJSpeech-1.1","*",":","cite",":","`","ljspeech17","`","dataset",".","Args",":","root","(","str","or","Path",")",":","Path","to","the","directory","where","the","dataset","is","found","or","downloaded",".","url","(","str",",","optional",")",":","The","URL","to","download","the","dataset","from",".","(","default",":","``","``","https",":","\/\/data.keithito.com\/data\/speech\/LJSpeech-1.1.tar.bz2","''","``",")","folder_in_archive","(","str",",","optional",")",":","The","top-level","directory","of","the","dataset",".","(","default",":","``","``","wavs","''","``",")","download","(","bool",",","optional",")",":","Whether","to","download","the","dataset","if","it","is","not","found","at","root","path",".","(","default",":","``","False","``",")","."]
code: def __len__(self) -> int:
      return len(self._flist)
  
file_path: audio/src/torchaudio/datasets/ljspeech.py
imports: import csv
  import os
  from pathlib import Path
  from typing import Tuple, Union
  import torchaudio
  from torch import Tensor
  from torch.utils.data import Dataset
  from torchaudio._internal import download_url_to_file
  from torchaudio.datasets.utils import _extract_tar
label_desc: Use image node_id 4 for calling the LJSPEECH obj's underlying member method code with example usage: obj.__len__() and returns: len