SDXL support for XTI

[levi]

@kohya-ss have you investigated updating the XTI script to support SDXL?

I dug into it a little bit today and the main unknown on my end is how to update the XTI layers to support SDXL's architecture. SD 1.x has 16 cross attention layers (6 Down, 1 Mid, 9 Up) -- which you've labeled as IN, MID, OUT. Based on my counting SDXL has 11? (4 Down, 1 Mid, 6 Up). Do we need to reduce the number of layers and add the additional tokenizer and text encoder? Is there anything else?

[ThereforeGames]

I'm curious to know about this as well!