Data Preparation for Large Language Models. - Hao Liang 017; Zhen Hao Wong; Rui-Tong Liu; Yu-Han Wang; Meiyi Qiang; Zhengyang Zhao 003; Chengyu Shen; Conghui He; Wentao Zhang 001; Bin Cui 001 (J. Comput. Sci. Technol., 2026)