along to the AttentionProcessor as defined under
self.processor in
diffusers.models.attention_processor.   guidance_rescale (float, optional, defaults to 0.0) —
Guidance rescale factor proposed by Common Diffusion Noise Schedules and Sample Steps are
Flawed guidance_scale is defined as φ in equation 16. of
Common Diffusion Noise Schedules and Sample Steps are Flawed.
Guidance rescale factor should fix overexposure when using zero terminal SNR. 