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01 ·Generative Models·★ MEMBER·PAPER·11 min read Build Your Own Diffusion Model — Starting from MNIST A diffusion model built up from nothing on 28×28 handwritten digits: the two conditions a noise schedule has to satisfy, how the step number gets injected into a U-Net, and why the sampler adds noise back at the very end — the places you only discover by writing the code yourself.