BiCon-Gate: Consistency-Gated De-colloquialisation for Dialogue Fact-Checking

BiCon-Gate is a new method that boosts automated fact-checking in conversations by using a technique called consistency-gated de-colloquialisation. It creates conservative rewritten options for claims through a step-by-step de-colloquialisation, which combines light surface normalization with focused coreference resolution. A special consistency gate, which is aware of the dialogue’s meaning, picks a rewritten option only if it aligns with the context; if not, it sticks with the original claim. This careful selection process makes fact-checking more reliable and enhances both evidence gathering and verification. When tested on the DialFact benchmark, BiCon-Gate outperformed other methods, especially excelling in SUPPORTS and beating a competitive one-shot LLM rewrite approach.