Add exp_heun_2_x0 sampler series#11360
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comfyanonymous merged 2 commits intoComfy-Org:masterfrom Dec 17, 2025
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What is the model? |
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There is a embedded workflow in the image, so you can find it there. |
They looks very complicated lol |
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A preset of
seeds_2withr=1andsolver_type=phi_2.The current
heunsampler can do noise prediction or RF v-prediction, depending on the model. However, there is no preset for Heun-style sampler in data (x0) prediction.Additionally, for ztsnr schedule,
heuntends to collapse due to step size sensitivity. Thus,exp_heun_2_x0can be aheunalternative for ztsnr.A demo by ztsnr schedule with CFG=3.0.
The issue of the current
heunis shown in the grid.Since it's based on
seeds_2, the SDE version is simple to add.