self supervision

False Frontiers: Diagnosing and Mitigating Co-Cheating in Self-Evolving Search Agentsarxiv.org

Self-evolving search agents can suffer from "co-cheating," where the question proposer and answer solver increasingly agree on shared errors, improving internal reward without external correctness gains. The paper introduces CrossFit, a method that partitions source documents and uses cross-fitted agreement to determine proposer reward, significantly reducing false agreement and improving downstr…