PNDM Pseudo Numerical Methods for Diffusion Models on Manifolds (PNDM) is by Luping Liu, Yi Ren, Zhijie Lin and Zhou Zhao. The abstract from the paper is: Denoising Diffusion Probabilistic Models (DDPMs) can generate high-quality samples such as image and audio samples. However, DDPMs require hundreds to thousands of iterations to produce final samples. Several prior works have successfully accelerated DDPMs through adjusting the variance sched