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Apply LoRA during model conversion #709

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Green-Sky
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@Green-Sky Green-Sky commented Jun 29, 2025 •
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Very rough code, but works.
Useful for avoiding the lora overhead during inference, or just mixing your own model from loras.

Patch based on (outdated) @stduhpf / bleedingedge : Green-Sky@69028c7

Keep in mind that the weights are first quantized, and then it tries to apply the loras. (which is very not ideal)

Example

merging lcm lora into a sd1.5 finetune:

$ result/bin/sd -M convert -m models/CyberRealistic_V9_FP16.safetensors --lora-model-dir models/loras/sd1/ -p "<lora:lcm-lora-sdv1-5:1>" -o models/CyberRealistic_V9-lcm-q8_0.gguf
[INFO ] model.cpp:910  - load models/CyberRealistic_V9_FP16.safetensors using safetensors format
[INFO ] model.cpp:2106 - lora lcm-lora-sdv1-5:1.00
[INFO ] model.cpp:2121 - found at 'models/loras/sd1/lcm-lora-sdv1-5.safetensors'
[INFO ] model.cpp:1987 - model tensors mem size: 2035.18MB
  |==================================================| 1131/1131 - 500.00it/s
[INFO ] model.cpp:2032 - load tensors done
[INFO ] model.cpp:910  - load models/loras/sd1/lcm-lora-sdv1-5.safetensors using safetensors format
[INFO ] lora.hpp:117  - loading LoRA from 'models/loras/sd1/lcm-lora-sdv1-5.safetensors'
  |==================================================| 834/834 - 0.00it/s
[INFO ] model.cpp:2047 - applied 'models/loras/sd1/lcm-lora-sdv1-5.safetensors':1.000000
[INFO ] model.cpp:2052 - trying to save tensors to models/CyberRealistic_V9-lcm-q8_0.gguf
convert 'models/CyberRealistic_V9_FP16.safetensors'/'' to 'models/CyberRealistic_V9-lcm-q8_0.gguf' success

@Green-Sky
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ggml switched to c++17, sd.cpp should too.

@Green-Sky Green-Sky changed the title merge in loras during model conversion Apply LoRA during model conversion Jun 29, 2025
@rmatif rmatif mentioned this pull request Aug 6, 2025
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