LoRA+

This repository contains the code for LoRA+, introduced in LoRA+: Efficient Low Rank Adaptation of Large Models.

Usage

LoRA+ introduces one new required hyperparameter to your optimizer (and another optional hyperparameter).

LoRA+ arguments

loraplus_lr_ratio: the ratio of learning rates $\eta_B / \eta_A$ where $\eta_A$ is the optimizer learning rate. Set this to a value greater than 1 for best performance. See the paper for more information.
loraplus_lr_embedding: (optional) if LoRA modules are added to embedding layers your can specify an different learning rate for them. Default value 1e-6.

With Huggingface Trainer

To integrate LoRA+ into a finetuning project using huggingface Trainer is straightforward. Just replace the Trainer in your project with LoraPlusTrainer in loraplus.py and pass in the LoRA+ arguments above to its TrainingArguments.

No Trainer

For training with LoRA+ without Trainer you can just use an optimizer created with the create_loraplus_optimizer function in loraplus.py. This function wraps an optimizer class and sets the learning rates of your model parameters appropriately for the optimizer.

import torch

# LoRA model
model = ...

optimizer_cls = torch.optim.AdamW
optimizer_kwargs = {'lr': 5e-5, 'eps': 1e-6, 'betas': (0.9, 0.999), 'weight_decay': 0.0}
loraplus_lr_ratio = 20.0
optimizer = _create_optimizer(model, optimizer_cls, optimizer_kwargs, loraplus_ratio):

Examples

In the glue/ folder we have code for finetuning models on GLUE using LoRA+.

Requirements

To run the code, first install the requirements using:

pip install -r requirements.txt

Running GLUE Experiments

Download the glue tasks using e.g. :

python download_glue.py --task_names mnli,qqp --datadir data/

Check scripts/ folder for finetuning examples with gpt2, roberta-base, and llama-7b.

Citation

This code is part of the LoRA+ project. For citations, please use

@article{hayou2024loraplus,
      title={LoRA+: Efficient Low Rank Adaptation of Large Models}, 
      author={Soufiane Hayou and Nikhil Ghosh and Bin Yu},
      year={2024},
      journal={arXiv 2402.12354}
}

dameikle/loraplus