Computer Science > Computation and Language
arXiv:2310.08372 (cs)
[Submitted on 12 Oct 2023 (v1), last revised 3 Nov 2023 (this version, v3)]
Title:Improving Factual Consistency for Knowledge-Grounded Dialogue Systems via Knowledge Enhancement and Alignment
Authors:Boyang Xue,Weichao Wang,Hongru Wang,Fei Mi,Rui Wang,Yasheng Wang,Lifeng Shang,Xin Jiang,Qun Liu,Kam-Fai Wong
View a PDF of the paper titled Improving Factual Consistency for Knowledge-Grounded Dialogue Systems via Knowledge Enhancement and Alignment, by Boyang Xue and Weichao Wang and Hongru Wang and Fei Mi and Rui Wang and Yasheng Wang and Lifeng Shang and Xin Jiang and Qun Liu and Kam-Fai Wong
View PDFAbstract:Pretrained language models (PLMs) based knowledge-grounded dialogue systems are prone to generate responses that are factually inconsistent with the provided knowledge source. In such inconsistent responses, the dialogue models fail to accurately express the external knowledge they rely upon. Inspired by previous work which identified that feed-forward networks (FFNs) within Transformers are responsible for factual knowledge expressions, we investigate two methods to efficiently improve the factual expression capability {of FFNs} by knowledge enhancement and alignment respectively. We first propose \textsc{K-Dial}, which {explicitly} introduces {extended FFNs in Transformers to enhance factual knowledge expressions} given the specific patterns of knowledge-grounded dialogue inputs. Additionally, we apply the reinforcement learning for factual consistency (RLFC) method to implicitly adjust FFNs' expressions in responses by aligning with gold knowledge for the factual consistency preference. To comprehensively assess the factual consistency and dialogue quality of responses, we employ extensive automatic measures and human evaluations including sophisticated fine-grained NLI-based metrics. Experimental results on WoW and CMU\_DoG datasets demonstrate that our methods efficiently enhance the ability of the FFN module to convey factual knowledge, validating the efficacy of improving factual consistency for knowledge-grounded dialogue systems.
| Comments: | EMNLP2023 Findings |
| Subjects: | Computation and Language (cs.CL) |
| Cite as: | arXiv:2310.08372 [cs.CL] |
| (orarXiv:2310.08372v3 [cs.CL] for this version) | |
| https://doi.org/10.48550/arXiv.2310.08372 arXiv-issued DOI via DataCite |
Submission history
From: Boyang Xue [view email][v1] Thu, 12 Oct 2023 14:44:05 UTC (8,855 KB)
[v2] Mon, 16 Oct 2023 01:47:05 UTC (8,848 KB)
[v3] Fri, 3 Nov 2023 07:26:42 UTC (8,796 KB)
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View a PDF of the paper titled Improving Factual Consistency for Knowledge-Grounded Dialogue Systems via Knowledge Enhancement and Alignment, by Boyang Xue and Weichao Wang and Hongru Wang and Fei Mi and Rui Wang and Yasheng Wang and Lifeng Shang and Xin Jiang and Qun Liu and Kam-Fai Wong
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