Although here Joint Seq2Seq gets the better BLEU score against the incomplete reference, Selective Decoding is able to better generlize over the train data: the facts it generates are much closer to the original input sentence, and even better than the reference.
结果 , 民主党 失去 了 列举 布什 " 罪状 " 的 良 机 , (the Democratic party lost a good opportunity to list the ' charges ' against Bush.