From Simple to Complex: A Progressive Framework for Document-level Informative Argument Extraction

Quzhe Huang, Yanxi Zhang, Dongyan Zhao


Abstract
Document-level Event Argument Extraction (EAE) requires the model to extract arguments of multiple events from a single document. Considering the underlying dependencies between these events, recent efforts leverage the idea of “memory”, where the results of already predicted events are cached and can be retrieved to help the prediction of upcoming events. These methods extract events according to their appearance order in the document, however, the event that appears in the first sentence does not mean that it is the easiest to extract. Existing methods might introduce noise to the extraction of upcoming events if they rely on an incorrect prediction of previous events. In order to provide more reliable memory, we propose a simple-to-complex progressive framework for document-level EAE. Specifically, we first calculate the difficulty of each event and then, we conduct the extraction following a simple-to-complex order. In this way, the memory will store the most certain results, and the model could use these reliable sources to help the prediction of more difficult events. Experiments on WikiEvents show that our model outperforms SOTA by 1.4% in F1, indicating the proposed simple-to-complex framework is useful in the EAE task.
Anthology ID:
2023.findings-emnlp.408
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2023
Month:
December
Year:
2023
Address:
Singapore
Editors:
Houda Bouamor, Juan Pino, Kalika Bali
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
6129–6140
Language:
URL:
https://aclanthology.org/2023.findings-emnlp.408
DOI:
10.18653/v1/2023.findings-emnlp.408
Bibkey:
Cite (ACL):
Quzhe Huang, Yanxi Zhang, and Dongyan Zhao. 2023. From Simple to Complex: A Progressive Framework for Document-level Informative Argument Extraction. In Findings of the Association for Computational Linguistics: EMNLP 2023, pages 6129–6140, Singapore. Association for Computational Linguistics.
Cite (Informal):
From Simple to Complex: A Progressive Framework for Document-level Informative Argument Extraction (Huang et al., Findings 2023)
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PDF:
https://aclanthology.org/2023.findings-emnlp.408.pdf