Before revision:  We conduct  human evaluation to compare our method to a paraphraser trained on a large English synthetic paraphrase database  and find that our model produces paraphrases that better preserve semantic meaning and grammatically , for the same level of lexical /syntactic diversity.
After revision:  We conduct human evaluation to compare our method to a paraphraser trained on a large English synthetic paraphrase database and find that our model produces paraphrases that better preserve semantic meaning and grammatically , for the same level of lexical diversity.