Why it matters

DDIM enabled practical diffusion. Understanding shapes samplers.

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The architecture

Non-Markovian reverse.

Deterministic when eta=0.

Skip timesteps.

DDIM sampler flowReverse processnon-MarkovSkip steps10-50 vs 1000Deterministic pathreproducibleeta=0 fully deterministic; between 0-1 stochastic; standard for diffusion
DDIM.
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How it works end to end

Song et al. 2020.

Reverse: x_{t-1} from x_t + predicted noise.

eta parameter controls stochasticity.

Skip: subsample timesteps.