arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.13312cs.CL
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减少抽象概括中的数量幻觉

Reducing Quantity Hallucinations in Abstractive Summarization

Institute for Language, Cognition and Computation(语言、认知与计算研究所);University of Edinburgh(爱丁堡大学)

Zheng Zhao, Shay B. Cohen, Bonnie Webber

摘要:

众所周知,摘要容易让人产生幻觉-包括原文没有支持的材料。虽然可以通过将摘要限制为一般短语来使摘要不产生幻觉,但这样的摘要将无法提供非常多的信息。或者,人们可以通过验证摘要中的任何特定实体在类似的上下文中出现在原始文本中来避免幻觉。这就是我们的系统所采取的方法,赫尔曼。系统学习识别和验证数量实体(日期,数字,金额等)。在由最先进的模型制作的大量抽象摘要中,以便提高原始文本支持数量术语的摘要的排名。实验结果表明,这样的排名上升的摘要的ROUGE分数具有更高的精度比没有被提升排名的摘要,没有相当的召回损失,导致更高的F $_1$。对排名上升的摘要与原始摘要的初步人类评估显示了人们对前者的偏好。

英文摘要:

It is well-known that abstractive summaries are subject to hallucination---including material that is not supported by the original text. While summaries can be made hallucination-free by limiting them to general phrases, such summaries would fail to be very informative. Alternatively, one can try to avoid hallucinations by verifying that any specific entities in the summary appear in the original text in a similar context. This is the approach taken by our system, Herman. The system learns to recognize and verify quantity entities (dates, numbers, sums of money, etc.) in a beam-worth of abstractive summaries produced by state-of-the-art models, in order to up-rank those summaries whose quantity terms are supported by the original text. Experimental results demonstrate that the ROUGE scores of such up-ranked summaries have a higher Precision than summaries that have not been up-ranked, without a comparable loss in Recall, resulting in higher F$_1$. Preliminary human evaluation of up-ranked vs. original summaries shows people's preference for the former.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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