code: def _gen_file(
      self,
      ext,
      dtype,
      sample_rate,
      num_channels,
      num_frames,
      *,
      comments=None,
  ):
      path = self.get_temp_path(f"test.{ext}")
      bit_depth = sox_utils.get_bit_depth(dtype)
      duration = num_frames / sample_rate
      comment_file = (
          self._gen_comment_file(comments) if comments else None
      )
  
      sox_utils.gen_audio_file(
          path,
          sample_rate,
          num_channels=num_channels,
          encoding=sox_utils.get_encoding(dtype),
          bit_depth=bit_depth,
          duration=duration,
          comment_file=comment_file,
      )
      return path
  
imports: import itertools
  import os
  from functools import partial
  from parameterized import parameterized
  from torchaudio._backend.utils import get_info_func
  from torchaudio._internal import module_utils
  from torchaudio_unittest.backend.common import get_encoding
  from torchaudio_unittest.common_utils import disabledInCI, get_asset_path, get_wav_data, HttpServerMixin, PytorchTestCase, save_wav, skipIfNoExec, skipIfNoModule, skipIfNoSox, skipIfNoSoxDecoder, sox_utils, TempDirMixin
  from .common import name_func
label_desc: Use image node_id 1 for calling the FileObjTestBase obj's underlying member method code with example usage: obj._gen_file(ext, dtype, sample_rate, num_channels, num_frames) and returns: path