expense of slower inference.   height (int, optional, defaults to 512) —
The height in pixels of the generated image.   width (int, optional, defaults to 512) —
The width in pixels of the generated image.   prior_guidance_scale (float, optional, defaults to 4.0) —
Guidance scale as defined in Classifier-Free Diffusion Guidance.
guidance_scale is defined as w of equation 2. of Imagen
Paper. Guidance scale is enabled by setting guidance_scale > 1