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SAFEval: Summarization Asks for Fact-based Evaluation

2021-03-23 17:16:09
Thomas Scialom, Paul-Alexis Dray, Patrick Gallinari, Sylvain Lamprier, Benjamin Piwowarski, Jacopo Staiano, Alex Wang

Abstract

Summarization evaluation remains an open research problem: current metrics such as ROUGE are known to be limited and to correlate poorly with human judgments. To alleviate this issue, recent work has proposed evaluation metrics which rely on question answering models to assess whether a summary contains all the relevant information in its source document. Though promising, the proposed approaches have so far failed to correlate better than ROUGE with human judgments. In this paper, we extend previous approaches and propose a unified framework, named SAFEval. In contrast to established metrics such as ROUGE or BERTScore, SAFEval does not require any ground-truth reference. Nonetheless, SAFEval substantially improves the correlation with human judgments over four evaluation dimensions (consistency, coherence, fluency, and relevance), as shown in the extensive experiments we report.

Abstract (translated)

URL

https://arxiv.org/abs/2103.12693

PDF

https://arxiv.org/pdf/2103.12693.pdf


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