ComfyUI-sonar

A janky implementation of Sonar sampling (momentum-based sampling) for ComfyUI as well as an assortment of advanced noise tools.

Disclaimer: It's very likely stuff like implementation and inputs to nodes will still be changing fairly frequently. In other words, don't depend on reproduceable generations with this unless you're willing to keep track of the git revision something was generated with.

Momentum based sampling currently supports Euler, Euler Ancestral, and DPM++ SDE sampling.

See the ChangeLog for recent user-visible changes.

Description

This started out as an implementation of Sonar sampling and has evolved into something more like a noise toybox.

Please note that while a lot of the nodes in here have a Sonar prefix, that doesn't indicate a relation with the original Sonar sampling implementation. Why is there random noise stuff in this repo? Mainly because it gets very awkward having node collections depending on other node collections.

Keep reading below this section for information on Sonar sampling and associated nodes.

For information on the advanced noise tools which include many different noise types, nodes to schedule, composite and otherwise manipulate noise see:

• Base Noise Types - examples and descriptions of the base noise types.
• Advanced Power Noise - examples and descriptions of the advanced power noise node.
• Advanced Noise Nodes - examples and descriptions of advanced noise nodes (schedule, composite, etc).
• FreeU Extreme - a build your own FreeU kit that allows advanced filtering, blending, scheduling of effects as well as targetting input and middle blocks.

Sonar Description

See https://github.com/Kahsolt/stable-diffusion-webui-sonar for a more in-depth explanation.

The direction parameter should (unless I screwed it up) work like setting sign to positive or negative: 1.0 is positive, -1.0 is negative. You can also potentially play with fractional values.

Like the original documentation says, you normally would not want to set momentum to a value below 0.85. The default values are considered reasonable, doing stuff like using a negative direction may not produce good results.

Usage

The most flexible way to use this is with a custom sampler:

You can also just choose sonar_euler, sonar_euler_ancestral or sonar_dpmpp_sde from the normal samplers list (will use the default settings). I personally recommend using the custom sampler approach and the ancestral version.

Nodes

SamplerSonarEuler

Custom sampler node that combines Euler sampling and momentum and optionally guidance. A bit boring compared to the ancestral version but it has predictability going for it. You can possibly try setting init type to RAND and using different noise types, however this sampler seems very sensitive to that init type. You may want to set direction to a very low value like 0.05 or -0.15 when using the RAND init type. Setting momentum=1 is the same as disabling momentum, so this sampler with momentum=1 is basically the same as the basic euler sampler.

SamplerSonarEulerAncestral

Ancestral version of the above. Same features, just with ancestral Euler.

SamplerSonarDPMPPSDE

Attempt to add momentum and guidance to the DPM++ SDE sampler. It may not work correctly but you can sample stuff with it and get interesting results. I actually really like this one, and you can get away with more extreme stuff like green_test noise and still produce reasonable results. You may want to use the BlehDiscardPenultimateSigma node from my ComfyUI-bleh collection if you find the result seems a bit washed out and blurry.

SonarGuidanceConfig

You can optionally plug this into the Sonar sampler nodes. See the Guidance section below.

Sonar Sampler Parameters

Very abbreviated section. The init type can make a big difference. If you use RANDOM you can get away with setting direction to high values (like up to 2.25 or so) and absurdly low values (like -30.0). It's also possible to set momentum and momentum_hist to negative values, although whether it's a good idea...

Guidance

You can try the SamplerSonarNaive sampler which has an optional latent input. The guidance probably isn't working correctly and the implementation definitely isn't exactly the same as the original A1111 version but it still might be fun to play with. The linear guidance type is a lot more sensitive to the guidance_factor than the euler type. For euler, reasonable values are around 0.01 to 0.1, for linear reasonable values are more like 0.001 to 0.02. It is also possible to set guidance factor to a negative value, I've found this results in high contrast and very vivid colors.

It is possible to set the start and end steps guidance is activate. Rather than setting a low guidance and using it for the whole generation, it's also possible to set high guidance and end it after a relatively low number of steps.

Without guidance it should basically work the same as the ancestral Euler version. There are some example images in the Examples section below.

Note: The reference latent needs to be the same size as the one being sampled. Also note that step numbers in the step range are 1-based and inclusive, so 1 is the first step.

Noise

See Base Noise Types for examples.

The sampler and NoisyLatentLike nodes now take an optional SonarCustomNoise input.

Note: If you connect the optional SonarCustomNoise node to a Sonar sampler, the NoisyLatentLike node or the SamplerConfigOverride node, it will override the noise type selected in the node.

Integrations

You'll get some bonus features if you have some other node collections installed:

KRestartSamplerCustomNoise

If you have a recent enough version of ComfyUI_restart_sampling installed, you'll also get the KRestartSamplerCustomNoise node which is exactly the same as KRestartSamplerCustom except for adding an optional custom noise input. See the restart sampling repo for more information: https://github.com/ssitu/ComfyUI_restart_sampling

RestartSamplerCustomNoise

As above, except this is the custom sampler version.

Related

I also have some other ComfyUI nodes here: https://github.com/blepping/ComfyUI-bleh/

Credits

Original Sonar Sampler implementation (for A1111): https://github.com/Kahsolt/stable-diffusion-webui-sonar

My version was initially based on this Sonar sampler implementation for Diffusers: https://github.com/alexblattner/modified-euler-samplers-for-sonar-diffusers/

• Many noise generation functions copied from https://github.com/Clybius/ComfyUI-Extra-Samplers with only minor modifications. I may have broken some of them in the process or they may not have been suitable for use and I took them anyway. If they don't work it is not a reflection on the original source.
• Noise spectral modulation modified from https://github.com/Clybius/ComfyUI-Extra-Samplers
• New pyramid noise based on implementation in Jonathan Whitaker's article on multi-resolution noise.
• Original SonarPowerNoise contributed by elias-gaeros. Additionally, he provided a lot of guidance with refactoring it to allow separate filtering and other enhancements and answered a multitude of dumb questions. To say those changes are only co-authored is probably giving myself too much credit. Thank you! Your patience and help is very much appreciated.
• New 1/f (onef) and power law (white, grey, violet, velvet) noise types referenced from https://github.com/WASasquatch/PowerNoiseSuite

Errata

• The noise types might not actually do what they claim. In that, I mean something I called "pink" noise might not be what is technically known as "pink noise". My implementations are best-effort. Bug reports and contributions to improve this repo are always welcome!
• Whether noise gets generated on GPU or CPU is probably inconsistent. This means changing GPU types may change seeds, also when this eventually gets fixed it will probably also change seeds.

Sonar Examples

Unfortunately, right now these examples are somewhat incomplete and out of date. I hope to update them when I get the time.

Guidance

<details> <summary>Expand guidance example images</summary>

Positive

Using the linear guidance type and guidance_factor=0.02. The reference image was a red and blue checkboard pattern.

Negative

Using the linear guidance type and guidance_factor=-0.015. The reference image was a red and blue checkboard pattern.

</details>

Noise Types

See:

• Base Noise Types
• Advanced Power Noise
• Advanced Noise Nodes