Adaptive knowledge-enhanced Bayesian meta-learning for few-shot event detection

Shirong Shen, Tongtong Wu, Guilin Qi, Yuan-Fang Li, Gholamreza Haffari, Sheng Bi

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Event detection (ED) aims at detecting event
trigger words in sentences and classifying
them into specific event types. In real-world
applications, ED typically does not have sufficient
labelled data, thus can be formulated as a few-shot learning problem. To tackle the issue of low sample diversity in few-shot ED, we propose a novel knowledge-based fewshot event detection method which uses a definition-based encoder to introduce external event knowledge as the knowledge prior of
event types. Furthermore, as external knowledge
typically provides limited and imperfect coverage of event types, we introduce an adaptive knowledge-enhanced Bayesian metalearning method to dynamically adjust the knowledge prior of event types. Experiments show our method consistently and substantially outperforms a number of baselines by at least 15 absolute F1 points under the same fewshot settings.
Original languageEnglish
Title of host publicationFindings of the Association for Computational Linguistics
Subtitle of host publication ACL-IJCNLP 2021
EditorsFei Xia, Wenjie Li, Roberto Navigli
Place of PublicationStroudsburg PA USA
PublisherAssociation for Computational Linguistics (ACL)
Pages2417–2429
Number of pages13
ISBN (Electronic)9781954085541
DOIs
Publication statusPublished - 2021
EventAnnual Meeting of the Association for Computational Linguistics and the International Joint Conference on Natural Language Processing 2021 - Online, Bangkok, Thailand
Duration: 1 Aug 20216 Aug 2021
Conference number: 59th & 11th
https://aclanthology.org/2021.acl-long.0/ (Proceedings)
https://2021.aclweb.org (Website)
https://aclanthology.org/volumes/2021.findings-acl/ (Findings Proceedings)
https://aclanthology.org/2021.acl-short.100/ (Proceedings Short)

Conference

ConferenceAnnual Meeting of the Association for Computational Linguistics and the International Joint Conference on Natural Language Processing 2021
Abbreviated titleACL-IJCNLP 2021
Country/TerritoryThailand
CityBangkok
Period1/08/216/08/21
Internet address

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