QACHECK: A Demonstration System for Question-Guided Multi-Hop
  Fact-Checking
Liangming Pan Xinyuan Lu Min-Yen Kan Preslav Nakov
Fact-checking real-world claims often requires complex, multi-step reasoning
due to the absence of direct evidence to support or refute them. However,
existing fact-checking systems often lack transparency in their
decision-making, making it challenging for users to comprehend their reasoning
process. To address this, we propose the Question-guided Multi-hop
Fact-Checking (QACHECK) system, which guides the model's reasoning process by
asking a series of questions critical for verifying a claim. QACHECK has five
key modules: a claim verifier, a question generator, a question-answering
module, a QA validator, and a reasoner. Users can input a claim into QACHECK,
which then predicts its veracity and provides a comprehensive report detailing
its reasoning process, guided by a sequence of (question, answer) pairs.
QACHECK also provides the source of evidence supporting each question,
fostering a transparent, explainable, and user-friendly fact-checking process.
A recorded video of QACHECK is at https://www.youtube.com/watch?v=ju8kxSldM64