T2I-R1: Reinforcing Image Generation with Collaborative Semantic-level and Token-level CoT - JIANG, Dongzhi; Guo, Ziyu; Zhang, Renrui; ZONG, ZHUOFAN; Li, Hao; Zhuo, Le; Yan, Shilin; Heng, Pheng-Ann; Li, Hongsheng (Advances in Neural Information Processing Systems, 2025)