Migrate ER-SDE from VE to VP algorithm and add its sampler node #8744
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Apply alpha scaling in the algorithm for reverse-time SDE and add custom ER-SDE sampler node for other solver types (SDE, ODE).
rakki194
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Jul 21, 2025
…yanonymous#8744) Apply alpha scaling in the algorithm for reverse-time SDE and add custom ER-SDE sampler node for other solver types (SDE, ODE).
rakki194
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Jul 29, 2025
…yanonymous#8744) Apply alpha scaling in the algorithm for reverse-time SDE and add custom ER-SDE sampler node for other solver types (SDE, ODE).
rakki194
pushed a commit
to rakki194/ComfyUI
that referenced
this pull request
Jul 29, 2025
…yanonymous#8744) Apply alpha scaling in the algorithm for reverse-time SDE and add custom ER-SDE sampler node for other solver types (SDE, ODE).
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This will change the results in RF.
Unlike other SDE samplers, the current ER-SDE appears compatible with RF because it does not introduce as much stochasticity. However, this still causes the results to be slightly over-bright. Moreover, it does not properly support reverse-time SDEs under RF. Since ER-SDE unifies reverse-time SDEs and ODEs, using its VP algorithm to apply alpha scaling may be more appropriate.
To provide access to reverse-time SDE and ODE solver types, this PR also introduces a custom sampler node.
Test with SD3.5 medium, CFG 4.0, and sgm_uniform 20 steps.
All images in the Euler column are the same and serve as the baseline reference.
With the current ER-SDE, the cloud loses detail and appears as plain white light in this case.