arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.01488cs.LGcs.CLstat.ML
收藏

文本生成中质量多样性评价与分布拟合目标的关系

On the Relation between Quality-Diversity Evaluation and Distribution-Fitting Goal in Text Generation

Institute of Computing Technology, Chinese Academy of Sciences(中国科学院计算技术研究所);University of Chinese Academy of Sciences(中国科学院大学)

Jianing Li, Yanyan Lan, Jiafeng Guo, Xueqi Cheng

摘要:

文本生成模型的目标是拟合文本的潜在真实概率分布。对于性能评估,通常应用质量和多样性度量。然而,质量多样性评价在多大程度上能够反映分布拟合目标,目前还不清楚。本文试图从理论上揭示这种关系。我们证明了在一定条件下,质量和多样性的线性组合构成了生成分布和真实分布之间的发散度量。我们还表明,常用的BLEU/Self-BLEU度量对无法匹配任何发散度量,因此提出CR/NRR作为质量/多样性度量对的替代。

英文摘要:

The goal of text generation models is to fit the underlying real probability distribution of text. For performance evaluation, quality and diversity metrics are usually applied. However, it is still not clear to what extend can the quality-diversity evaluation reflect the distribution-fitting goal. In this paper, we try to reveal such relation in a theoretical approach. We prove that under certain conditions, a linear combination of quality and diversity constitutes a divergence metric between the generated distribution and the real distribution. We also show that the commonly used BLEU/Self-BLEU metric pair fails to match any divergence metric, thus propose CR/NRR as a substitute for quality/diversity metric pair.

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。

↑