Add Tweedie Moment Projected Diffusion (TMPD) guidance #17
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This PR implements Tweedie Moment Projected Diffusion (TMPD) guidance. More precisely, it implements the diagonal version of TMPD, in which$A \mathbb{V}[x \mid x_t] A^\top$ is approximated as a diagonal matrix $\mathrm{diag}(A \mathbb{V}[x \mid x_t] A^\top e)$ where $e$ is the all-ones vector.
The method was proposed by Boys et al. (2023) in Tweedie Moment Projected Diffusions For Inverse Problems.