Afterburner: Reinforcement Learning Facilitates Self-Improving Code Efficiency Optimization - Du, Mingzhe; Luu, Anh Tuan; Liu, Yue; Qing, Yuhao; HUANG, Dong; He, Xinyi; Liu, Qian; MA, Zejun; Ng, See-Kiong (Advances in Neural Information Processing Systems, 2025)