VidBridge-R1: Bridging QA and Captioning for RL-based Video Understanding Models with Intermediate Proxy Tasks - Chen, Xinlong; Zhang, Yuanxing; Guan, Yushuo; Lin, Weihong; Wang, Zekun; Zeng, Bohan; Shi, Yang; Yang, Sihan; Liu, Qiang; Wan, Pengfei; Wang, Liang (International Conference on Learning Representations, 2026)