code: def __call__(self, xs):
      """Return enhanced
  
      :param np.ndarray xs: (Time, Channel, Frequency)
      :return: enhanced_xs
      :rtype: np.ndarray
  
      """
      from nara_wpe.wpe import wpe
  
      # nara_wpe.wpe: (F, C, T)
      xs = wpe(
          xs.transpose((2, 1, 0)),
          taps=self.taps,
          delay=self.delay,
          iterations=self.iterations,
          psd_context=self.psd_context,
          statistics_mode=self.statistics_mode,
      )
      return xs.transpose(2, 1, 0)
  
label_desc: Use image node_id 3 for calling the WPE obj's underlying member method code with example usage: obj.__call__(xs) and returns: xs