sd-forge-beta57

A tiny standalone extension for sd-webui-forge-classic (Neo branch) that adds the beta57 sigma scheduler from RES4LYF.

Registers a single extra entry in the Schedule type dropdown:

beta57 is the Beta-distribution-PPF sigma schedule with alpha = 0.5 and beta = 0.7 hard-pinned at the RES4LYF defaults. The math is the same family as forge-neo's built-in Beta scheduler — the only difference is that the built-in Beta reads alpha / beta from shared.opts.beta_dist_alpha / beta_dist_beta, while this one keeps them fixed regardless of UI option changes so the curve is stable across sessions.

Reference: RES4LYF/sigmas.py line 1421 calls comfy.samplers.beta_scheduler(model_sampling, total_steps, alpha=0.5, beta=0.7).

Whenever the upstream RES4LYF docs / workflows pick beta57 — i.e. with the RES / DEIS samplers, especially on flow / rectified-flow models (SD3.5, Flux, Wan, ANIMA, etc.). On these models beta57 tends to give better detail and prompt adherence than the standard karras / exponential / simple schedules because it spends more steps in the mid-sigma range where the velocity field changes most.

It also works fine with any of forge-neo's stock samplers (Euler, DPM++, Res Multistep, …). It's just a sigma curve.

1. Unzip into your forge-neo extensions/ directory:

   <your-forge-neo>/extensions/sd-forge-beta57/
   <your-forge-neo>/extensions/sd-forge-beta57/scripts/beta57.py
   

2. Restart the WebUI. Pick Beta57 (RES4LYF) from the Schedule type dropdown.

This extension does only the scheduler. It does not vendor any other RES4LYF code, does not add RES / DEIS samplers, does not touch the model or attention layers. If you want the samplers as well, use the larger sd-forge-res4lyf extension instead.

• Pure scheduler code — has no opinion about the sampler, model architecture (epsilon / v / flow), or any of forge-neo's runtime flags (--sage, int8, torch.compile, etc.).
• Skips registration cleanly if a scheduler named beta57 is already present (e.g. because sd-forge-res4lyf is also installed).
• Dependencies: numpy and scipy, both of which the WebUI already uses for the built-in Beta scheduler.

Apache-2.0. The scheduler implementation mirrors RES4LYF (Apache-2.0) and forge-neo's beta_scheduler (AGPL-3.0 for the upstream A1111-derived code); this extension distributes only the small re-implementation in scripts/beta57.py under Apache-2.0.

• beta57 curve choice: ClownsharkBatwing / RES4LYF (Apache-2.0)
• Underlying Beta-PPF formulation: "Beta Sampling is All You Need" — Lee et al., 2024 (arXiv:2407.12173)