Nugget Proposal Networks for Chinese Event Detection

Hongyu Lin, Yaojie Lu, Xianpei Han, Le Sun


Abstract
Neural network based models commonly regard event detection as a word-wise classification task, which suffer from the mismatch problem between words and event triggers, especially in languages without natural word delimiters such as Chinese. In this paper, we propose Nugget Proposal Networks (NPNs), which can solve the word-trigger mismatch problem by directly proposing entire trigger nuggets centered at each character regardless of word boundaries. Specifically, NPNs perform event detection in a character-wise paradigm, where a hybrid representation for each character is first learned to capture both structural and semantic information from both characters and words. Then based on learned representations, trigger nuggets are proposed and categorized by exploiting character compositional structures of Chinese event triggers. Experiments on both ACE2005 and TAC KBP 2017 datasets show that NPNs significantly outperform the state-of-the-art methods.
Anthology ID:
P18-1145
Volume:
Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
Month:
July
Year:
2018
Address:
Melbourne, Australia
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
1565–1574
Language:
URL:
https://aclanthology.org/P18-1145
DOI:
10.18653/v1/P18-1145
Bibkey:
Cite (ACL):
Hongyu Lin, Yaojie Lu, Xianpei Han, and Le Sun. 2018. Nugget Proposal Networks for Chinese Event Detection. In Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 1565–1574, Melbourne, Australia. Association for Computational Linguistics.
Cite (Informal):
Nugget Proposal Networks for Chinese Event Detection (Lin et al., ACL 2018)
Copy Citation:
PDF:
https://aclanthology.org/P18-1145.pdf
Poster:
 P18-1145.Poster.pdf
Code
 sanmusunrise/NPNs