def METHOD_NAME(spk, spk2utt, utt2ivc):
    ivc_list = [kaldiio.load_mat(utt2ivc[utt])[np.newaxis, :] for utt in spk2utt[spk]]
    ivc = np.concatenate(ivc_list, axis=0)
    ivc = np.mean(ivc, axis=0, keepdims=False)
    return ivc