Implicit Reward as the Bridge: A Unified View of SFT and DPO Connections - Wang, Bo; Cheng, Qinyuan; Peng, Runyu; Bao, Rong; Li, Peiji; Guo, Qipeng; Li, Linyang; Zeng, Zhiyuan; Zhou, Yunhua; Qiu, Xipeng (Advances in Neural Information Processing Systems, 2025)