ior_timesteps   num_inference_steps (int, optional, defaults to 12) —
The number of decoder denoising steps. More denoising steps usually lead to a higher quality image at
the expense of slower inference. For more specific timestep spacing, you can pass customized
timesteps   decoder_guidance_scale (float, optional, defaults to 0.0) —
Guidance scale as defined in Classifier-Free Diffusion Guidance.
guidance_scale is defined as w of equation 2. 