Rethinking Data Curation in LLM Training: Online Reweighting Offers Better Generalization than Offline Methods - Zhao, Wanru; Chen, Yihong; Tang, Yuzhi; Ma, Wentao; Hu, Shengchao; Hu, Xu; Iacob, Alex; Mehrotra, Abhinav; Lane, Nic (International Conference on Learning Representations, 2026)