arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2211.01577cs.CL
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面向事件抽取的开放词汇论元角色预测

Open-Vocabulary Argument Role Prediction for Event Extraction

University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校)

Yizhu Jiao, Sha Li, Yiqing Xie, Ming Zhong, Heng Ji, Jiawei Han

摘要:

事件抽取中的论元角色是指事件与参与其中的论元之间的关系,尽管事件抽取的研究取得了很大的进展,但现有的研究仍然依赖于领域专家预先定义的角色。这些研究在扩展到新兴事件类型或没有可用角色的新领域时暴露出明显的弱点。因此,需要将更多的注意力和精力投入到自动定制参数角色上。在本文中,我们定义了一个重要但尚未被充分研究的任务:开放式词汇论元角色预测。此任务的目标是推断给定事件类型的一组参数角色。我们提出了一个新的无监督框架,RolePred的这项任务。具体来说,我们制定的角色预测问题作为一个填充任务,并构造提示预训练的语言模型,以生成候选角色。通过提取和分析候选参数,进一步合并和选择特定于事件的角色。为了规范该任务的研究,我们从Wikipedia收集了一个新的事件提取数据集,包括142个具有丰富语义的自定义参数角色。在这个数据集上,RolePred的性能大大优于现有的方法。源代码和数据集可在我们的GitHub存储库中获得:https://github.com/yzjiao/RolePred

英文摘要:

The argument role in event extraction refers to the relation between an event and an argument participating in it. Despite the great progress in event extraction, existing studies still depend on roles pre-defined by domain experts. These studies expose obvious weakness when extending to emerging event types or new domains without available roles. Therefore, more attention and effort needs to be devoted to automatically customizing argument roles. In this paper, we define this essential but under-explored task: open-vocabulary argument role prediction. The goal of this task is to infer a set of argument roles for a given event type. We propose a novel unsupervised framework, RolePred for this task. Specifically, we formulate the role prediction problem as an in-filling task and construct prompts for a pre-trained language model to generate candidate roles. By extracting and analyzing the candidate arguments, the event-specific roles are further merged and selected. To standardize the research of this task, we collect a new event extraction dataset from WikiPpedia including 142 customized argument roles with rich semantics. On this dataset, RolePred outperforms the existing methods by a large margin. Source code and dataset are available on our GitHub repository: https://github.com/yzjiao/RolePred

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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