Yggdrasil: Bridging Dynamic Speculation and Static Runtime for Latency-Optimal Tree-Based LLM Decoding - Guan, Yue; Yu, Changming; Fang, Shihan; Hu, Weiming; Pan, Zaifeng; Wang, Zheng; Liu, Zihan; Zhou, Yangjie; Ding, Yufei; Guo, Minyi; Leng, Jingwen (Advances in Neural Information Processing Systems, 2025)