arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.03037cs.CLcs.AI
收藏

基于谓词导向潜图的会话语义角色标注

Conversational Semantic Role Labeling with Predicate-Oriented Latent Graph

Wuhan University(武汉大学);Harbin Institute of Technology (Shenzhen)(哈尔滨工业大学(深圳));Guangdong University of Foreign Studies(广东外语外贸大学)

Hao Fei, Shengqiong Wu, Meishan Zhang, Yafeng Ren, Donghong Ji

摘要:

会话语义角色标注是一项新提出的任务,旨在揭示会话文本中的浅层语义结构。然而,CSRL任务的几个重要特征,如结构信息整合、近邻影响等,却被现有的研究所忽视。在这项工作中,我们研究了CSRL的潜在图的整合。我们提出了一种以谓词为中心的高斯机制,自动诱导一个面向谓词的潜在图(POLar),通过该机制,更接近谓词的信息词将被分配更多的注意力。然后,POLar结构被动态地修剪和细化,以便最好地满足任务需求。我们还引入了一个有效的对话级预训练的语言模型,CoDiaBERT,更好地支持多个话语句子和处理CSRL中的说话人共指问题。我们的系统在三个基准CSRL数据集上的性能优于最佳基线,特别是在跨话语参数检测上实现了超过4%的F1分数改进。进一步的分析,以更好地了解我们提出的方法的有效性。

英文摘要:

Conversational semantic role labeling (CSRL) is a newly proposed task that uncovers the shallow semantic structures in a dialogue text. Unfortunately several important characteristics of the CSRL task have been overlooked by the existing works, such as the structural information integration, near-neighbor influence. In this work, we investigate the integration of a latent graph for CSRL. We propose to automatically induce a predicate-oriented latent graph (POLar) with a predicate-centered Gaussian mechanism, by which the nearer and informative words to the predicate will be allocated with more attention. The POLar structure is then dynamically pruned and refined so as to best fit the task need. We additionally introduce an effective dialogue-level pre-trained language model, CoDiaBERT, for better supporting multiple utterance sentences and handling the speaker coreference issue in CSRL. Our system outperforms best-performing baselines on three benchmark CSRL datasets with big margins, especially achieving over 4% F1 score improvements on the cross-utterance argument detection. Further analyses are presented to better understand the effectiveness of our proposed methods.

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。

↑