Open-Domain Targeted Sentiment Analysis via Span-Based Extraction and Classification

Minghao Hu, Yuxing Peng, Zhen Huang, Dongsheng Li, Yiwei Lv


Abstract
Open-domain targeted sentiment analysis aims to detect opinion targets along with their sentiment polarities from a sentence. Prior work typically formulates this task as a sequence tagging problem. However, such formulation suffers from problems such as huge search space and sentiment inconsistency. To address these problems, we propose a span-based extract-then-classify framework, where multiple opinion targets are directly extracted from the sentence under the supervision of target span boundaries, and corresponding polarities are then classified using their span representations. We further investigate three approaches under this framework, namely the pipeline, joint, and collapsed models. Experiments on three benchmark datasets show that our approach consistently outperforms the sequence tagging baseline. Moreover, we find that the pipeline model achieves the best performance compared with the other two models.
Anthology ID:
P19-1051
Volume:
Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics
Month:
July
Year:
2019
Address:
Florence, Italy
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
537–546
Language:
URL:
https://aclanthology.org/P19-1051
DOI:
10.18653/v1/P19-1051
Bibkey:
Cite (ACL):
Minghao Hu, Yuxing Peng, Zhen Huang, Dongsheng Li, and Yiwei Lv. 2019. Open-Domain Targeted Sentiment Analysis via Span-Based Extraction and Classification. In Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics, pages 537–546, Florence, Italy. Association for Computational Linguistics.
Cite (Informal):
Open-Domain Targeted Sentiment Analysis via Span-Based Extraction and Classification (Hu et al., ACL 2019)
Copy Citation:
PDF:
https://aclanthology.org/P19-1051.pdf
Code
 huminghao16/SpanABSA