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Creating a lora from the base checkpoint and a fine tuned checkpoint.

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I noticed that the SDD-1B SDXL checkpoint is half the size of the original model, but there are no models that have fine-tuned the small model.

So I was wondering if it is possible to create a lora from the difference between the SDXL 1.0 checkpoint and one of the fine-tuned SDXL checkpoints. I know we can merge a lora into a base model, but not sure if you can recreate that lora again from the merged model.

Then take that lora and merge it into the smaller base model.

Might be a way to rapidly fine tune the smaller model without having to go through all that training again. I was just wondering if there would be some problem with doing things this way. Would we just end up with a 6.5GB model again, or would it stay half sized. Would it even work or just generate horrible distorted images.

I have been using a lot of lora that was trained on SDXL 1.0 base checkpoint with the SDD-1B checkpoint and that appears to be working perfectly.

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