require 'kaldi_io'

frm_ext = 5
feat_repo = nerv.KaldiFeatureRepo("ark:/slfs6/users/ymz09/kaldi/src/featbin/copy-feats scp:/slfs6/users/ymz09/swb_ivec/train_bp.scp ark:- |")

feat_utter = feat_repo:cur_utter(true)
print(feat_utter)