Hengyuan Hu Aniket Das Dorsa Sadigh Nima Anari Diffusion Models are Secretly Exchangeable: Parallelizing DDPMs via Auto Speculation. 2025 ICML https://proceedings.mlr.press/v267/hu25d.html https://openreview.net/forum?id=n08niE37ku conf/icml/2025 db/conf/icml/icml2025.html#HuDSA25