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The paper addresses the challenge of fact-checking in dialogues, where colloquial language hinders accurate verification. They introduce a two-stage de-colloquialisation process involving surface normalization and in-claim coreference resolution to generate rewrite candidates. A novel "BiCon-Gate" is then used to selectively apply these rewrites based on semantic consistency with the dialogue context, improving both evidence retrieval and fact verification.
Fact-checking dialogues? A semantics-aware gate that selectively "de-colloquialises" claims outperforms even LLM-based rewrite approaches, stabilizing downstream verification.
Automated fact-checking in dialogue involves multi-turn conversations where colloquial language is frequent yet understudied. To address this gap, we propose a conservative rewrite candidate for each response claim via staged de-colloquialisation, combining lightweight surface normalisation with scoped in-claim coreference resolution. We then introduce BiCon-Gate, a semantics-aware consistency gate that selects the rewrite candidate only when it is semantically supported by the dialogue context, otherwise falling back to the original claim. This gated selection stabilises downstream fact-checking and yields gains in both evidence retrieval and fact verification. On the DialFact benchmark, our approach improves retrieval and verification, with particularly strong gains on SUPPORTS, and outperforms competitive baselines, including a decoder-based one-shot LLM rewrite that attempts to perform all de-colloquialisation steps in a single pass.
