PALM encodes a path as a one-hot outgoing edge for every vertex, so any PALM output of the discrete diffusion model decodes to a valid path; DDPS adds reward-gradient guidance to steer sampling toward preferred edges.
D irichlet diffusion score model for biological sequence generation
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DDPS: Discrete Diffusion Posterior Sampling for Paths in Layered Graphs
PALM encodes a path as a one-hot outgoing edge for every vertex, so any PALM output of the discrete diffusion model decodes to a valid path; DDPS adds reward-gradient guidance to steer sampling toward preferred edges.