The difference between pred_x0, pred_v, pred_noise three objectives

[lucidrains]

you'll need to read the following papers

https://arxiv.org/abs/2006.11239 (predict start, predict noise) https://arxiv.org/abs/2202.00512 (predict v)

[Birch-san]

https://learnopencv.com/denoising-diffusion-probabilistic-models/#Training-Objective-&-Loss-Function-Used-In-Denoising-Diffusion-Probabilistic-Models