How to install Stable Diffusion web UI from AUTOMATIC1111 on a Mac Intel?

I've recently tried to use the Stable Diffusion web UI from AUTOMATIC1111 on my Mac Intel. There is no documentation for Mac Intel, and when I tried to use the methods presented for other platforms, I ended-up with a Python exception related to LZMA:

ModuleNotFoundError: No module named '_lzma'

I was able to fix the problem thanks to this stack overflow post. This allowed me to write an installation guide / documentation for Mac Intel that I share in my answer.

My configuration:

• MacBook Pro 2019
• CPU 2,6 GHz 6-Core Intel Core i7
• GPU Intel UHD Graphics 630 1536 MB
• Memory 32 GB 2667 MHz DDR4
• System macOS Ventura 13.2.1

Prerequisites:

• Have brew installed
• Have git installed
• Have pyenv installed
• Know how to use a Terminal

Installation guide:

1. Open a Terminal and move to the directory where you want to install Stable Diffusion web UI.

2. Using the Terminal, clone the stable-diffusion-webui repo. This will create a stable-diffusion-webui directory. Once the cloning is done, move into this directory:

$ git clone git@github.com:AUTOMATIC1111/stable-diffusion-webui.git
$ cd stable-diffusion-webui

3. Using the Terminal, install xz with brew. Note that this needs to be done before installing Python 3.10:

$ brew install xz

4. Using the Terminal, install Python 3.10 using pyenv. Then set the local Python version to 3.10 in the stable-diffusion-webui directory. This will only affect the Python version used within this directory, the default Python version will be unchanged:

$ pyenv install 3.10
$ pyenv local 3.10

5. Download a Stable Diffusion model checkpoint. I downloaded the 1.5 version (v1-5-pruned.ckpt file) from the Hugging Face website. Then move the checkpoint into the models/Stable-diffusion directory.

6. Using the Terminal, run the webui.sh script:

$ ./webui.sh

If everything went fine, you should have in the Terminal a message that looks like this:

Running on local URL: http://127.0.0.1:7860

7. Open the URL in an Internet browser. In the txt2img tab, enter a prompt and click the generate button. This will start the image generation process.

The image I attached to this post was generated on my MacBook Pro Intel.