Nemotron-CLIMB: Clustering-based Iterative Data Mixture Bootstrapping for Language Model Pre-training - Diao, Shizhe; Yang, Yu; Fu, Yonggan; Dong, Xin; SU, Dan; Kliegl, Markus; CHEN, ZIJIA; Belcak, Peter; Suhara, Yoshi; Yin, Hongxu; Patwary, Mostofa; Lin, Yingyan (Celine); et al. (Advances in Neural Information Processing Systems, 2025)