GOOD: Training-Free Guided Diffusion Sampling for Out-of-Distribution Detection - Gao, Xin; Liu, Jiyao; Li, Guanghao; Lyu, Yueming; Gao, Jianxiong; Yu, Weichen; Xu, Ningsheng; Wang, Liang; Shan, Caifeng; Liu, Ziwei; Si, Chenyang (Advances in Neural Information Processing Systems, 2025)