code: def setUpClass(cls):
      super().setUpClass()
      cls.root_dir = cls.get_base_temp_dir()
      COMMONVOICE._ext_audio = ".wav"
  
imports: import csv
  import os
  from pathlib import Path
  from typing import Dict, Tuple
  from torch import Tensor
  from torchaudio.datasets import COMMONVOICE
  from torchaudio_unittest.common_utils import get_whitenoise, normalize_wav, save_wav, TempDirMixin, TorchaudioTestCase
label_desc: Use image node_id 1 for calling the BaseTestCommonVoice obj's underlying member method code with example usage: obj.setUpClass(cls) without return types