def METHOD_NAME(self, feat: np.ndarray) -> Tuple[np.ndarray, np.ndarray]:
    if self.lfr_m != 1 or self.lfr_n != 1:
        feat = self.apply_lfr(feat, self.lfr_m, self.lfr_n)
    if self.cmvn_file:
        feat = self.apply_cmvn(feat)
    feat_len = np.array(feat.shape[0]).astype(np.int32)
    return feat, feat_len