['keras', 'arxiv:2010.02502', 'arxiv:1505.04597', 'arxiv:2006.11239', 'arxiv:1706.03762', 'arxiv:1711.05101', 'generative', 'denoising', 'diffusion', 'ddim', 'ddpm', 'unconditional-image-generation', 'has_space']