sifier-Free Diffusion Guidance.
guidance_scale is defined as w of equation 2. of Imagen
Paper. Guidance scale is enabled by setting guidance_scale > 1. Higher guidance scale encourages to generate images that are closely linked to the text prompt,
usually at the expense of lower image quality.


sag_scale (float, optional, defaults to 0.75) —
SAG scale as defined in [Improving Sample Quality of Diffusion Models Using Self-Attention Guidance]
(h