Critique-RL: Training Language Models For Critiquing Through Two-Stage Reinforcement Learning - Xi, Zhiheng; Huang, Jixuan; Guo, Xin; Hong, Boyang; Yang, Dingwen; Fan, Xiaoran; Li, Shuo; Chen, Zehui; Ye, Junjie; Yuan, Siyu; Du, Zhengyin; Yao, Xuesong; et al. (International Conference on Learning Representations, 2026)