DDPM:Compute Pa(x) Denoise Denoise XT-1 Mean of Pe(xt-1lxt) Denoise G(x) Gaussian exp(-IIG(xt)-xt-1l2) Pe(xo)=P(xr)Po(xr-1lxr)..Pe(xt-1lxt)..Pe(xolxi)dx1:xr X1:XT DDPM: Compute 𝑃𝜃 𝑥 Denoise Denoise …… 𝑥𝑇 𝑥𝑇−1 𝑥0 𝑃𝜃 𝑥0 = න 𝑥1:𝑥𝑇 𝑃 𝑥𝑇 𝑃𝜃 𝑥𝑇−1|𝑥𝑇 … 𝑃𝜃 𝑥𝑡−1|𝑥𝑡 … 𝑃𝜃 𝑥0|𝑥1 𝑑𝑥1: 𝑥𝑇 Denoise 𝑥𝑡 Mean of Gaussian 𝐺 𝑥𝑡 𝑃𝜃 𝑥𝑡−1|𝑥𝑡 ∝ exp − 𝐺 𝑥𝑡 − 𝑥𝑡−1 2