def METHOD_NAME(self, inputs: Dict[str, Any], **kwargs) -> Dict[str, Any]:
    r"""The post process. Will save audio to file, if the output_path is given.
    Args:
        inputs: a dict contains following keys:
            - output_pcm: generated audio array
        kwargs: accept 'output_path' which is the path to write generated audio
    Returns:
        output_pcm: generated audio array
    """
    if 'output_path' in kwargs.keys():
        wav.write(
            kwargs['output_path'], self.preprocessor.SAMPLE_RATE,
            np.frombuffer(inputs[OutputKeys.OUTPUT_PCM], dtype=np.int16))
    return inputs