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arXiv 1906.06362cs.CL
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条件语言模型的多种解码方法比较

Comparison of Diverse Decoding Methods from Conditional Language Models

University of Pennsylvania(宾夕法尼亚大学)

Daphne Ippolito, Reno Kriz, Maria Kustikova, João Sedoc, Chris Callison-Burch

摘要:

虽然条件语言模型在输出高质量自然语言的能力方面有了很大的提高,但许多NLP应用程序都受益于能够生成一组不同的候选序列。不同的解码策略旨在在给定大小的候选列表内覆盖尽可能多的高质量输出空间,从而改进重新排序和组合候选输出的任务。诸如束搜索的标准解码方法优化用于生成高似然序列而不是多样序列,尽管最近的工作集中在增加这些方法中的多样性。在这项工作中,我们进行了广泛的调查,解码时间策略产生不同的输出条件语言模型。我们还展示了如何在不牺牲质量的情况下,通过对额外的候选人进行过采样,然后过滤到所需的数量来提高多样性。

英文摘要:

While conditional language models have greatly improved in their ability to output high-quality natural language, many NLP applications benefit from being able to generate a diverse set of candidate sequences. Diverse decoding strategies aim to, within a given-sized candidate list, cover as much of the space of high-quality outputs as possible, leading to improvements for tasks that re-rank and combine candidate outputs. Standard decoding methods, such as beam search, optimize for generating high likelihood sequences rather than diverse ones, though recent work has focused on increasing diversity in these methods. In this work, we perform an extensive survey of decoding-time strategies for generating diverse outputs from conditional language models. We also show how diversity can be improved without sacrificing quality by over-sampling additional candidates, then filtering to the desired number.

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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