Affective Event Classification with Discourse-enhanced Self-training

Yuan Zhuang, Tianyu Jiang, Ellen Riloff


Abstract
Prior research has recognized the need to associate affective polarities with events and has produced several techniques and lexical resources for identifying affective events. Our research introduces new classification models to assign affective polarity to event phrases. First, we present a BERT-based model for affective event classification and show that the classifier achieves substantially better performance than a large affective event knowledge base. Second, we present a discourse-enhanced self-training method that iteratively improves the classifier with unlabeled data. The key idea is to exploit event phrases that occur with a coreferent sentiment expression. The discourse-enhanced self-training algorithm iteratively labels new event phrases based on both the classifier’s predictions and the polarities of the event’s coreferent sentiment expressions. Our results show that discourse-enhanced self-training further improves both recall and precision for affective event classification.
Anthology ID:
2020.emnlp-main.452
Volume:
Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP)
Month:
November
Year:
2020
Address:
Online
Editors:
Bonnie Webber, Trevor Cohn, Yulan He, Yang Liu
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
5608–5617
Language:
URL:
https://aclanthology.org/2020.emnlp-main.452
DOI:
10.18653/v1/2020.emnlp-main.452
Bibkey:
Cite (ACL):
Yuan Zhuang, Tianyu Jiang, and Ellen Riloff. 2020. Affective Event Classification with Discourse-enhanced Self-training. In Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP), pages 5608–5617, Online. Association for Computational Linguistics.
Cite (Informal):
Affective Event Classification with Discourse-enhanced Self-training (Zhuang et al., EMNLP 2020)
Copy Citation:
PDF:
https://aclanthology.org/2020.emnlp-main.452.pdf
Video:
 https://slideslive.com/38939141
Code
 yyzhuang1991/DEST