code: def add_audio(self, tag, audio, sample_rate=44100, global_step=None):
          
          self._file_writer.add_summary(audio_summary(tag, audio, sample_rate=sample_rate),
                                        global_step)
docs: Add audio data to the event file.
  
          Note: This function internally calls `asnumpy()` for MXNet `NDArray` inputs.
          Since `asnumpy()` is a blocking function call, this function would block the main
          thread till it returns. It may consequently affect the performance of async execution
          of the MXNet engine.
  
          Parameters
          ----------
              tag : str
                  Name for the `audio`.
              audio : MXNet `NDArray` or `numpy.ndarray`
                  Audio data squeezable to a 1D tensor. The values of the tensor are in the range
                  `[-1, 1]`.
              sample_rate : int
                  Sample rate in Hz.
              global_step : int
                  Global step value to record.