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Diffusion models have recently exhibited significant potential in generative modeling, surpassing generative adversarial networks concerning perceptual quality and autoregressive models in density estimation. However, a notable drawback of these models is their slow sampling time, requiring numerous model evaluations to generate high-quality samples. This research proposes a technique that incorporates cyclical stochastic gradient Langevin dynamics (SGLD) with elucidated diffusion models (EDM) sampler to enhance stability when utilizing a limited number of sampling steps. Cyclical step-size scheduling has been demonstrated to enhance the effectiveness of SGLD in learning complex multimodal distributions. By applying our method to well-established image generation benchmarks, such as CIFAR-10, AFHQv2, FFHQ, and ImageNet, we initially utilize state-of-the-art samplers requiring up to 4000 steps. However, our approach can significantly reduce the number of steps to as few as 18 and 40 while preserving considerable perceptual quality. For instance, on CIFAR-10, our method achieves a Fr&#x00E9;chet inception distance of 1.79 in just 18 steps.

Fast Sampling of Score-based Models with Cyclical Diffusion Sampling