code: def read(self, frames, dtype, always_2d):
      assert always_2d
      data = get_wav_data(
          dtype,
          self._params["num_channels"],
          normalize=False,
          num_frames=self._params["num_frames"],
          channels_first=False,
      ).numpy()
      return data[self._start : self._start + frames]
  
imports: import os
  import tarfile
  from unittest.mock import patch
  import torch
  from parameterized import parameterized
  from torchaudio._internal import module_utils
  from torchaudio.backend import soundfile_backend
  from torchaudio_unittest.common_utils import get_wav_data, load_wav, normalize_wav, PytorchTestCase, save_wav, skipIfNoModule, TempDirMixin
  from .common import dtype2subtype, parameterize, skipIfFormatNotSupported
label_desc: Use image node_id 6 for calling the SoundFileMock obj's underlying member method code with example usage: obj.read(frames, dtype, always_2d) and returns: data