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v0.9.0: Merging LoRA weights, new quantization options, DoRA support, and more
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@BenjaminBossan BenjaminBossan released this 28 Feb 10:37
· 241 commits to main since this release
v0.9.0
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Highlights

New methods for merging LoRA weights together

cat_teapot

With PR #1364, we added new methods for merging LoRA weights together. This is not about merging LoRA weights into the base model. Instead, this is about merging the weights from different LoRA adapters into a single adapter by calling add_weighted_adapter. This allows you to combine the strength from multiple LoRA adapters into a single adapter, while being faster than activating each of these adapters individually.

Although this feature has already existed in PEFT for some time, we have added new merging methods that promise much better results. The first is based on TIES, the second on DARE and a new one inspired by both called Magnitude Prune. If you haven't tried these new methods, or haven't touched the LoRA weight merging feature at all, you can find more information here:

AWQ and AQLM support for LoRA

Via #1394, we now support AutoAWQ in PEFT. This is a new method for 4bit quantization of model weights.

Screenshot 2024-02-28 at 09 41 40

Similarly, we now support AQLM via #1476. This method allows to quantize weights to as low as 2 bits. Both methods support quantizing nn.Linear layers. To find out more about all the quantization options that work with PEFT, check out our docs here.

Screenshot 2024-02-28 at 09 42 22

Note these integrations do not support merge_and_unload() yet, meaning for inference you need to always attach the adapter weights into the base model

DoRA support

We now support Weight-Decomposed Low-Rank Adaptation aka DoRA via #1474. This new method is builds on top of LoRA and has shown very promising results. Especially at lower ranks (e.g. r=8), it should perform much better than LoRA. Right now, only non-quantized nn.Linear layers are supported. If you'd like to give it a try, just pass use_dora=True to your LoraConfig and you're good to go.

Documentation

Thanks to @stevhliu and many other contributors, there have been big improvements to the documentation. You should find it more organized and more up-to-date. Our DeepSpeed and FSDP guides have also been much improved.

Check out our improved docs if you haven't already!

Development

If you're implementing custom adapter layers, for instance a custom LoraLayer, note that all subclasses should now implement update_layer -- unless they want to use the default method by the parent class. In particular, this means you should no longer use different method names for the subclass, like update_layer_embedding. Also, we generally don't permit ranks (r) of 0 anymore. For more, see this PR.

Developers should have an easier time now since we fully embrace ruff. If you're the type of person who forgets to call make style before pushing to a PR, consider adding a pre-commit hook. Tests are now a bit less verbose by using plain asserts and generally embracing pytest features more fully. All of this comes thanks to @akx.

What's Changed

On top of these changes, we have added a lot of small changes since the last release, check out the full changes below. As always, we had a lot of support by many contributors, you're awesome!

New Contributors

Full Changelog: v0.8.2...v0.9.0

Contributors

akx, szepeviktor, and 14 other contributors
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