DDIM gets stuck between modes in reverse diffusion on Gaussian mixtures after critical time τ, but DDPM stochasticity prevents this and lowers hallucination rates.
This is also empirically justified by Figure E.12
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Why DDIM Hallucinates More than DDPM: A Theoretical Analysis of Reverse Dynamics
DDIM gets stuck between modes in reverse diffusion on Gaussian mixtures after critical time τ, but DDPM stochasticity prevents this and lowers hallucination rates.