DeLIVeR

DeLIVeR: Reinforced knowledge graph exploration for LLM fact-checking

DeLIVeR is a new framework for automated fact-checking that decomposes complex claims into targeted questions and traverses structured Knowledge Graphs for evidence retrieval, optimizing a Planner LLM via Group Relative Policy Optimization (GRPO). Evaluated on LIAR, FEVER, and PolitiFact benchmarks using Qwen2.5-7B, the system achieves F1-scores of 83.73, 84.57, and 79.70 respectively, representing a 10-15% improvement over HippoRAG2. The approach addresses 'query brittleness' in traditional retrieval by framing evidence gathering as a reinforced strategic exploration task, yielding auditable reasoning paths.