code: def demo_to_buffer(file_path, sequence_length):
      
      brain_params, brain_infos, _ = load_demonstration(file_path)
      demo_buffer = make_demo_buffer(brain_infos, brain_params, sequence_length)
      return brain_params, demo_buffer
docs: Loads demonstration file and uses it to fill training buffer.
      :param file_path: Location of demonstration file (.demo).
      :param sequence_length: Length of trajectories to fill buffer.
      :return: