Prompting Large Language Models for Counterfactual Generation: An Empirical Study

Yongqi Li, Mayi Xu, Xin Miao, Shen Zhou, Tieyun Qian


Abstract
Large language models (LLMs) have made remarkable progress in a wide range of natural language understanding and generation tasks. However, their ability to generate counterfactuals has not been examined systematically. To bridge this gap, we present a comprehensive evaluation framework on various types of NLU tasks, which covers all key factors in determining LLMs’ capability of generating counterfactuals. Based on this framework, we 1) investigate the strengths and weaknesses of LLMs as the counterfactual generator, and 2) disclose the factors that affect LLMs when generating counterfactuals, including both the intrinsic properties of LLMs and prompt designing. The results show that, though LLMs are promising in most cases, they face challenges in complex tasks like RE since they are bounded by task-specific performance, entity constraints, and inherent selection bias. We also find that alignment techniques, e.g., instruction-tuning and reinforcement learning from human feedback, may potentially enhance the counterfactual generation ability of LLMs. On the contrary, simply increasing the parameter size does not yield the desired improvements. Besides, from the perspective of prompt designing, task guidelines unsurprisingly play an important role. However, the chain-of-thought approach does not always help due to inconsistency issues.
Anthology ID:
2024.lrec-main.1156
Volume:
Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024)
Month:
May
Year:
2024
Address:
Torino, Italia
Editors:
Nicoletta Calzolari, Min-Yen Kan, Veronique Hoste, Alessandro Lenci, Sakriani Sakti, Nianwen Xue
Venues:
LREC | COLING
SIG:
Publisher:
ELRA and ICCL
Note:
Pages:
13201–13221
Language:
URL:
https://aclanthology.org/2024.lrec-main.1156
DOI:
Bibkey:
Cite (ACL):
Yongqi Li, Mayi Xu, Xin Miao, Shen Zhou, and Tieyun Qian. 2024. Prompting Large Language Models for Counterfactual Generation: An Empirical Study. In Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024), pages 13201–13221, Torino, Italia. ELRA and ICCL.
Cite (Informal):
Prompting Large Language Models for Counterfactual Generation: An Empirical Study (Li et al., LREC-COLING 2024)
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PDF:
https://aclanthology.org/2024.lrec-main.1156.pdf