Recouple Event Field via Probabilistic Bias for Event Extraction

• URL: http://arxiv.org/abs/2305.11498v1
• Date: Fri, 19 May 2023 07:55:37 GMT
• Title: Recouple Event Field via Probabilistic Bias for Event Extraction
• Authors: Xingyu Bai, Taiqiang Wu, Han Guo, Zhe Zhao, Xuefeng Yang, Jiayi Li, Weijie Liu, Qi Ju, Weigang Guo, Yujiu Yang
• Abstract summary: Event Extraction aims to identify and classify event triggers and arguments from event mentions. Existing PLM-based methods ignore the information of trigger/argument fields. We propose a Probabilistic reCoupling model enhanced Event extraction framework.
• Score: 22.601552863742523
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Event Extraction (EE), aiming to identify and classify event triggers and arguments from event mentions, has benefited from pre-trained language models (PLMs). However, existing PLM-based methods ignore the information of trigger/argument fields, which is crucial for understanding event schemas. To this end, we propose a Probabilistic reCoupling model enhanced Event extraction framework (ProCE). Specifically, we first model the syntactic-related event fields as probabilistic biases, to clarify the event fields from ambiguous entanglement. Furthermore, considering multiple occurrences of the same triggers/arguments in EE, we explore probabilistic interaction strategies among multiple fields of the same triggers/arguments, to recouple the corresponding clarified distributions and capture more latent information fields. Experiments on EE datasets demonstrate the effectiveness and generalization of our proposed approach.

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