A Partition Filter Network for Joint Entity and Relation Extraction

Zhiheng Yan, Chong Zhang, Jinlan Fu, Qi Zhang, Zhongyu Wei


Abstract
In joint entity and relation extraction, existing work either sequentially encode task-specific features, leading to an imbalance in inter-task feature interaction where features extracted later have no direct contact with those that come first. Or they encode entity features and relation features in a parallel manner, meaning that feature representation learning for each task is largely independent of each other except for input sharing. We propose a partition filter network to model two-way interaction between tasks properly, where feature encoding is decomposed into two steps: partition and filter. In our encoder, we leverage two gates: entity and relation gate, to segment neurons into two task partitions and one shared partition. The shared partition represents inter-task information valuable to both tasks and is evenly shared across two tasks to ensure proper two-way interaction. The task partitions represent intra-task information and are formed through concerted efforts of both gates, making sure that encoding of task-specific features is dependent upon each other. Experiment results on six public datasets show that our model performs significantly better than previous approaches. In addition, contrary to what previous work has claimed, our auxiliary experiments suggest that relation prediction is contributory to named entity prediction in a non-negligible way. The source code can be found at https://github.com/Coopercoppers/PFN.
Anthology ID:
2021.emnlp-main.17
Volume:
Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing
Month:
November
Year:
2021
Address:
Online and Punta Cana, Dominican Republic
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
185–197
Language:
URL:
https://aclanthology.org/2021.emnlp-main.17
DOI:
10.18653/v1/2021.emnlp-main.17
Bibkey:
Cite (ACL):
Zhiheng Yan, Chong Zhang, Jinlan Fu, Qi Zhang, and Zhongyu Wei. 2021. A Partition Filter Network for Joint Entity and Relation Extraction. In Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing, pages 185–197, Online and Punta Cana, Dominican Republic. Association for Computational Linguistics.
Cite (Informal):
A Partition Filter Network for Joint Entity and Relation Extraction (Yan et al., EMNLP 2021)
Copy Citation:
PDF:
https://aclanthology.org/2021.emnlp-main.17.pdf
Video:
 https://aclanthology.org/2021.emnlp-main.17.mp4
Code
 Coopercoppers/PFN
Data
ACE 2004ACE 2005SciERCWebNLG