Eliciting Knowledge from Large Pre-Trained Models for Unsupervised Knowledge-Grounded Conversation

Yanyang Li, Jianqiao Zhao, Michael Lyu, Liwei Wang


Abstract
Recent advances in large-scale pre-training provide large models with the potential to learn knowledge from the raw text. It is thus natural to ask whether it is possible to leverage these large models as knowledge bases for downstream tasks. In this work, we answer the aforementioned question in unsupervised knowledge-grounded conversation. We explore various methods that best elicit knowledge from large models. Our human study indicates that, though hallucinations exist, large models post the unique advantage of being able to output common sense and summarize facts that cannot be directly retrieved from the search engine. To better exploit such generated knowledge in dialogue generation, we treat the generated knowledge as a noisy knowledge source and propose the posterior-based reweighing as well as the noisy training strategy. Empirical results on two benchmarks show advantages over the state-of-the-art methods.
Anthology ID:
2022.emnlp-main.721
Volume:
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing
Month:
December
Year:
2022
Address:
Abu Dhabi, United Arab Emirates
Editors:
Yoav Goldberg, Zornitsa Kozareva, Yue Zhang
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
10551–10564
Language:
URL:
https://aclanthology.org/2022.emnlp-main.721
DOI:
10.18653/v1/2022.emnlp-main.721
Bibkey:
Cite (ACL):
Yanyang Li, Jianqiao Zhao, Michael Lyu, and Liwei Wang. 2022. Eliciting Knowledge from Large Pre-Trained Models for Unsupervised Knowledge-Grounded Conversation. In Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing, pages 10551–10564, Abu Dhabi, United Arab Emirates. Association for Computational Linguistics.
Cite (Informal):
Eliciting Knowledge from Large Pre-Trained Models for Unsupervised Knowledge-Grounded Conversation (Li et al., EMNLP 2022)
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PDF:
https://aclanthology.org/2022.emnlp-main.721.pdf