How can we add negative prompts?

[danielclough]

I can not figure out how to add negative prompts.
I would be excited to learn how to send a PR for that if you like.

Can you suggest some reading to help me learn about what's going on here?

I have worked in Rust a bit.
I need to understand the torch part.

[Gadersd]

The diffusion guidance works by computing DP = (P-B)*g + B where DP is the diffused latent image, P is the diffused positive prompt, B is the diffused blank prompt, and g is the guidance scale. Adding a negative prompt could be as simple as DN = (N-B)*ng + B, D = 0.5(DP - DN) where D is the desired diffused latent image.

It shouldn't be too difficult so give it a try if you are interested. Otherwise I'll probably get around to it after I implement the refiner model.