Not All Documents Are What You Need for Extracting Instruction Tuning Data - Zhang, Chi; Zhong, Huaping; Li, Hongtao; Chai, Chengliang; Hongjiawei; Wang, Yu-Ping; Deng, Yuhao; Wang, Jiacheng; Yan, Yizhou; Jiantao, Qiu; He, Conghui; Cao, Lei (International Conference on Learning Representations, 2026)