Document-Level Multi-Event Extraction with Event Proxy Nodes and Hausdorff Distance Minimization

Xinyu Wang, Lin Gui, Yulan He


Abstract
Document-level multi-event extraction aims to extract the structural information from a given document automatically. Most recent approaches usually involve two steps: (1) modeling entity interactions; (2) decoding entity interactions into events. However, such approaches ignore a global view of inter-dependency of multiple events. Moreover, an event is decoded by iteratively merging its related entities as arguments, which might suffer from error propagation and is computationally inefficient. In this paper, we propose an alternative approach for document-level multi-event extraction with event proxy nodes and Hausdorff distance minimization. The event proxy nodes, representing pseudo-events, are able to build connections with other event proxy nodes, essentially capturing global information. The Hausdorff distance makes it possible to compare the similarity between the set of predicted events and the set of ground-truth events. By directly minimizing Hausdorff distance, the model is trained towards the global optimum directly, which improves performance and reduces training time. Experimental results show that our model outperforms previous state-of-the-art method in F1-score on two datasets with only a fraction of training time.
Anthology ID:
2023.acl-long.563
Volume:
Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
Month:
July
Year:
2023
Address:
Toronto, Canada
Editors:
Anna Rogers, Jordan Boyd-Graber, Naoaki Okazaki
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
10118–10133
Language:
URL:
https://aclanthology.org/2023.acl-long.563
DOI:
10.18653/v1/2023.acl-long.563
Bibkey:
Cite (ACL):
Xinyu Wang, Lin Gui, and Yulan He. 2023. Document-Level Multi-Event Extraction with Event Proxy Nodes and Hausdorff Distance Minimization. In Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 10118–10133, Toronto, Canada. Association for Computational Linguistics.
Cite (Informal):
Document-Level Multi-Event Extraction with Event Proxy Nodes and Hausdorff Distance Minimization (Wang et al., ACL 2023)
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PDF:
https://aclanthology.org/2023.acl-long.563.pdf
Video:
 https://aclanthology.org/2023.acl-long.563.mp4