chaObserv

### Expected Behavior With same setting, the result of KSampler and SamplerCustom should be the same. If not, it would need to show a hint to explain the difference at...

Add SA-Solver Sampler

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Add [SA-Solver](https://arxiv.org/abs/2309.05019) by applying modifications of Comfy's UniPC whose source code is also based on DPM-Solver. SA-Solver could be considered as a stochastic version UniPC with same order. When set...

Close #6623. Follow the transition method that keeps a conditional `denoised` and uses unconditional ones for the others.

I'm confused about the transition of CFG to CFG++ in some sampler cases. Some samplers, such as iPNDM, extend euler and do the noise combination based on ODE/SDE or other...

Although this one isn't as straightforward as the others, it can still perform the adaptation. Since ancestral sampling operates on scaled sigmas in other model types, this adaptation simulates the...

### Feature Idea Although input sigma and `sample_sigmas` can indicate the step in some cases, high-order single-step samplers can pass a sigma that does not appear in `sample_sigmas`. For instance,...

Add exp_heun_2_x0 sampler series

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A preset of `seeds_2` with `r=1` and `solver_type=phi_2`. The current `heun` sampler can do noise prediction or RF v-prediction, depending on the model. However, there is no preset for Heun-style...