class_docstr: Load YouTube urls as audio file(s).
code: def __init__(self, urls: List[str], save_dir: str):
      if not isinstance(urls, list):
          raise TypeError("urls must be a list")
  
      self.urls = urls
      self.save_dir = save_dir
      self.files_out = []
  
imports: import logging
  import os
  import tempfile
  import time
  from typing import Dict, Iterator, Optional, Tuple
  from langchain.document_loaders.base import BaseBlobParser
  from langchain.document_loaders.blob_loaders import Blob
  from langchain.document_loaders.generic import GenericLoader
  from langchain.schema import Document
  from typing import List, Union, Any, Tuple
  import requests
  from langchain.docstore.document import Document
  from langchain.document_loaders import ImageCaptionLoader
  from utils import get_device, NullContext, clear_torch_cache, have_use_faster, makedirs
  from importlib.metadata import distribution, PackageNotFoundError
  from typing import Iterable, List
  from langchain.document_loaders.blob_loaders import FileSystemBlobLoader
  from langchain.document_loaders.blob_loaders.schema import Blob, BlobLoader
label_desc: Use image node_id 1 to create a new YoutubeAudioLoader object from inherited base classes: BlobLoader with example: obj = YoutubeAudioLoader(urls, save_dir)