Multitask Learning of Negation and Speculation using Transformers

Aditya Khandelwal, Benita Kathleen Britto


Abstract
Detecting negation and speculation in language has been a task of considerable interest to the biomedical community, as it is a key component of Information Extraction systems from Biomedical documents. Prior work has individually addressed Negation Detection and Speculation Detection, and both have been addressed in the same way, using 2 stage pipelined approach: Cue Detection followed by Scope Resolution. In this paper, we propose Multitask learning approaches over 2 sets of tasks: Negation Cue Detection & Speculation Cue Detection, and Negation Scope Resolution & Speculation Scope Resolution. We utilise transformer-based architectures like BERT, XLNet and RoBERTa as our core model architecture, and finetune these using the Multitask learning approaches. We show that this Multitask Learning approach outperforms the single task learning approach, and report new state-of-the-art results on Negation and Speculation Scope Resolution on the BioScope Corpus and the SFU Review Corpus.
Anthology ID:
2020.louhi-1.9
Volume:
Proceedings of the 11th International Workshop on Health Text Mining and Information Analysis
Month:
November
Year:
2020
Address:
Online
Editors:
Eben Holderness, Antonio Jimeno Yepes, Alberto Lavelli, Anne-Lyse Minard, James Pustejovsky, Fabio Rinaldi
Venue:
Louhi
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
79–87
Language:
URL:
https://aclanthology.org/2020.louhi-1.9
DOI:
10.18653/v1/2020.louhi-1.9
Bibkey:
Cite (ACL):
Aditya Khandelwal and Benita Kathleen Britto. 2020. Multitask Learning of Negation and Speculation using Transformers. In Proceedings of the 11th International Workshop on Health Text Mining and Information Analysis, pages 79–87, Online. Association for Computational Linguistics.
Cite (Informal):
Multitask Learning of Negation and Speculation using Transformers (Khandelwal & Britto, Louhi 2020)
Copy Citation:
PDF:
https://aclanthology.org/2020.louhi-1.9.pdf
Video:
 https://slideslive.com/38940040