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Exploring Nested Named Entity Recognition with Large Language Models: Methods, Challenges, and Insights

Hongjin Kim, Jai-Eun Kim, Harksoo Kim


Abstract
Nested Named Entity Recognition (NER) poses a significant challenge in Natural Language Processing (NLP), demanding sophisticated techniques to identify entities within entities. This research investigates the application of Large Language Models (LLMs) to nested NER, exploring methodologies from prior work and introducing specific reasoning techniques and instructions to improve LLM efficacy. Through experiments conducted on the ACE 2004, ACE 2005, and GENIA datasets, we evaluate the impact of these approaches on nested NER performance. Results indicate that output format critically influences nested NER performance, methodologies from previous works are less effective, and our nested NER-tailored instructions significantly enhance performance. Additionally, we find that label information and descriptions of nested cases are crucial in eliciting the capabilities of LLMs for nested NER, especially in specific domains (i.e., the GENIA dataset). However, these methods still do not outperform BERT-based models, highlighting the ongoing need for innovative approaches in nested NER with LLMs.
Anthology ID:
2024.emnlp-main.492
Volume:
Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing
Month:
November
Year:
2024
Address:
Miami, Florida, USA
Editors:
Yaser Al-Onaizan, Mohit Bansal, Yun-Nung Chen
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
8653–8670
Language:
URL:
https://aclanthology.org/2024.emnlp-main.492
DOI:
Bibkey:
Cite (ACL):
Hongjin Kim, Jai-Eun Kim, and Harksoo Kim. 2024. Exploring Nested Named Entity Recognition with Large Language Models: Methods, Challenges, and Insights. In Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing, pages 8653–8670, Miami, Florida, USA. Association for Computational Linguistics.
Cite (Informal):
Exploring Nested Named Entity Recognition with Large Language Models: Methods, Challenges, and Insights (Kim et al., EMNLP 2024)
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PDF:
https://aclanthology.org/2024.emnlp-main.492.pdf