VideoChat-R1.5: Visual Test-Time Scaling to Reinforce Multimodal Reasoning by Iterative Perception - Yan, Ziang; He, Yinan; Li, Xinhao; Yue, Zhengrong; Zeng, Xiangyu; Wang, Yali; Qiao, Yu; Wang, Limin; Wang, Yi (Advances in Neural Information Processing Systems, 2025)