Varifocal Question Generation for Fact-checking

Nedjma Ousidhoum, Zhangdie Yuan, Andreas Vlachos


Abstract
Fact-checking requires retrieving evidence related to a claim under investigation. The task can be formulated as question generation based on a claim, followed by question answering.However, recent question generation approaches assume that the answer is known and typically contained in a passage given as input,whereas such passages are what is being sought when verifying a claim.In this paper, we present Varifocal, a method that generates questions based on different focal points within a given claim, i.e. different spans of the claim and its metadata, such as its source and date.Our method outperforms previous work on a fact-checking question generation dataset on a wide range of automatic evaluation metrics.These results are corroborated by our manual evaluation, which indicates that our method generates more relevant and informative questions.We further demonstrate the potential of focal points in generating sets of clarification questions for product descriptions.
Anthology ID:
2022.emnlp-main.163
Volume:
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing
Month:
December
Year:
2022
Address:
Abu Dhabi, United Arab Emirates
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
2532–2544
Language:
URL:
https://aclanthology.org/2022.emnlp-main.163
DOI:
Bibkey:
Cite (ACL):
Nedjma Ousidhoum, Zhangdie Yuan, and Andreas Vlachos. 2022. Varifocal Question Generation for Fact-checking. In Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing, pages 2532–2544, Abu Dhabi, United Arab Emirates. Association for Computational Linguistics.
Cite (Informal):
Varifocal Question Generation for Fact-checking (Ousidhoum et al., EMNLP 2022)
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PDF:
https://preview.aclanthology.org/emnlp-22-ingestion/2022.emnlp-main.163.pdf