DoReMi: Optimizing Data Mixtures Speeds Up Language Model Pretraining - Xie, Sang Michael; Pham, Hieu; Dong, Xuanyi; Du, Nan; Liu, Hanxiao; Lu, Yifeng; Liang, Percy S; Le, Quoc V; Ma, Tengyu; Yu, Adams Wei (Advances in Neural Information Processing Systems, 2023)