Why DDIM Hallucinates More Than DDPM: A Theoretical Analysis of Reverse Dynamics 事件

Why DDIM Hallucinates More Than DDPM: A Theoretical Analysis of Reverse Dynamics arXiv:2605.06831v2 Announce Type: replace-cross Abstract: We theoretically study the hallucination phenomena in two canonical diffusion samplers: the stochastic Denoising Diffusion Probabilistic Model (DDPM) and the deterministic Denoising Diffusion Implicit Model (DDIM). We analyze the reverse ODE (DDIM) and SDE (DDPM) for a Gaussian mixture target, proving that after a critical time $\tau$, (a) DDIM can become st