Semi-off-Policy Reinforcement Learning for Vision-Language Slow-Thinking Reasoning - Shen, Junhao; Zhao, Haiteng; Gu, Yuzhe; Gao, Songyang; Liu, Kuikun; Huang, Haian; Gao, Jianfei; Lin, Dahua; Zhang, Wenwei; Chen, Kai (Advances in Neural Information Processing Systems, 2025)