TempSamp-R1: Effective Temporal Sampling with Reinforcement Fine-Tuning for Video LLMs - Li, Yunheng; Cheng, Jing; Jia, Shaoyong; Kuang, Hangyi; Jiao, Shaohui; Hou, Qibin; Cheng, Ming-Ming (Advances in Neural Information Processing Systems, 2025)