Guided Decoupled Posterior Sampling (GDPS) adds a gradient step on the measurement mismatch ||y - A(x_t)||^2 during the reverse process, improving reconstruction accuracy over DAPS, SITCOM, Resample, and DPS.
Improved denoising diffusion probabilistic models
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Improving Decoupled Posterior Sampling for Inverse Problems using Data Consistency Constraint
Guided Decoupled Posterior Sampling (GDPS) adds a gradient step on the measurement mismatch ||y - A(x_t)||^2 during the reverse process, improving reconstruction accuracy over DAPS, SITCOM, Resample, and DPS.