Hierachical Balance Packing: Towards Efficient Supervised Fine-tuning for Long-Context LLM - Yao, Yongqiang; Tan, Jingru; Liang, Kaihuan; Zhang, Feizhao; Hu, Jiahao; Wu, Shuo; Niu, Yazhe; Gong, Ruihao; Lin, Dahua; Xu, Ningyi (Advances in Neural Information Processing Systems, 2025)