Outputting the input unchanged beats published BLEU and METEOR scores on Twitter and METEOR on Quora paraphrase benchmarks, showing standard evaluation can reward copying.
Bolshakov and Alexander Gelbukh
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Polly Want a Cracker: Analyzing Performance of Parroting on Paraphrase Generation Datasets
Outputting the input unchanged beats published BLEU and METEOR scores on Twitter and METEOR on Quora paraphrase benchmarks, showing standard evaluation can reward copying.