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Examples included in this guide on why you would want to use this.
How to utilize VAE
Stability AI has released two variants of fine-tuned VAE decoders, EMA and MSE, which are metrics for measuring how good the autoencoders are. EMA typically produces sharper images, while MSE's images are smoother. These fine-tuned VAEs can be used with any Stable Diffusion model, including custom ones and Stable Diffusion v2.0.
Here's how to use a VAE in Stable Diffusion from AUTOMATIC1111:
If you're using AUTOMATIC1111's GUI, place the downloaded VAE files in the directory
To use a VAE in AUTOMATIC1111 GUI, go to the Settings tab and click on the Stable Diffusion section on the left. Find a section called SD VAE, and in the dropdown menu, select the VAE file you want to use. Press the big red "Apply Settings" button on top. You should see the message "Settings: sd_vae applied" in the Setting tab when the loading is successful.
I have uploaded a mirror to the MSE Upscaler on Civitai here.
Note: Some models have a baked in VAE. If adding a VAE messes with your outputs then thats the reason.
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