Previous work on paraphrase generation that used these datasets (Wang et al., 2019;<cite> Gupta et al., 2018</cite>; Li et al., 1 https://data.quora.com/ First-Quora-Dataset-Release-Question-Pairs 2018; Prakash et al., 2016) chose BLEU (Papineni et al., 2002) , METEOR (Lavie and Agarwal, 2007) and TER (Snover et al., 2006) as evaluation metrics.