DuetSim: Building User Simulator with Dual Large Language Models for Task-Oriented Dialogues

Xiang Luo, Zhiwen Tang, Jin Wang, Xuejie Zhang


Abstract
User Simulators play a pivotal role in training and evaluating task-oriented dialogue systems. Traditional user simulators typically rely on human-engineered agendas, resulting in generated responses that often lack diversity and spontaneity. Although large language models (LLMs) exhibit a remarkable capacity for generating coherent and contextually appropriate utterances, they may fall short when tasked with generating responses that effectively guide users towards their goals, particularly in dialogues with intricate constraints and requirements. This paper introduces DuetSim, a novel framework designed to address the intricate demands of task-oriented dialogues by leveraging LLMs. DuetSim stands apart from conventional approaches by employing two LLMs in tandem: one dedicated to response generation and the other focused on verification. This dual LLM approach empowers DuetSim to produce responses that not only exhibit diversity but also demonstrate accuracy and are preferred by human users. We validate the efficacy of our method through extensive experiments conducted on the MultiWOZ dataset, highlighting improvements in response quality and correctness, largely attributed to the incorporation of the second LLM.
Anthology ID:
2024.lrec-main.481
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:
5414–5424
Language:
URL:
https://aclanthology.org/2024.lrec-main.481
DOI:
Bibkey:
Cite (ACL):
Xiang Luo, Zhiwen Tang, Jin Wang, and Xuejie Zhang. 2024. DuetSim: Building User Simulator with Dual Large Language Models for Task-Oriented Dialogues. In Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024), pages 5414–5424, Torino, Italia. ELRA and ICCL.
Cite (Informal):
DuetSim: Building User Simulator with Dual Large Language Models for Task-Oriented Dialogues (Luo et al., LREC-COLING 2024)
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PDF:
https://aclanthology.org/2024.lrec-main.481.pdf