mirror of
https://github.com/wassname/lora-lite.git
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wassname
82 lines
2.6 KiB
Markdown
82 lines
2.6 KiB
Markdown
# lora-lite
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Hackable PyTorch adapters for LoRA-family and small PEFT experiments.
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## Hackable code
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To keep it simple and hackable we make these choices:
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- Simple forward hooks, no module replacement or custom modules.
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- Simple code over fast performance
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- No merge/unmerge
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- Single test where we train on MetaMathQA and test on GSM8K for each variant
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Take a look at [lora.py](src/lora_lite/variants/lora.py)
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## Install
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```bash
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pip install -e git+https://github.com/wassname/lora-lite.git#egg=lora-lite
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```
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## Quickstart
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```python
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import torch, lora_lite as ll
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model = MyTransformer()
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cfg = ll.LoRAConfig(r=8, alpha=16, dtype=torch.bfloat16)
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ll.attach(model, cfg)
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opt = torch.optim.AdamW([p for p in model.parameters() if p.requires_grad], lr=1e-4)
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# train...
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ll.save(model, "adapter.safetensors")
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ll.detach(model)
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ll.load(model, "adapter.safetensors")
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```
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## Does it work?
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```bash
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just check # pytest + smoke + package build + metadata check
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just bnb-smoke # required CUDA bitsandbytes 4bit/8bit smoke
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just qwen-probe # Qwen/Qwen3-0.6B train/save-load probe
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```
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## Variants
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| Variant | 4bit/8bit | GSM8K % |
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| --------------------------------------------- | --------- | ------- |
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| [LoRA](https://arxiv.org/abs/2106.09685) | yes | 63.2% |
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| [PiSSA](https://arxiv.org/abs/2404.02948) | no | — |
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| [DeLoRA](https://arxiv.org/abs/2503.18225) | yes | — |
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| [IA3](https://arxiv.org/pdf/2205.05638) | yes | — |
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| [DoRA](https://arxiv.org/abs/2402.09353) | no | — |
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| [HRA](https://arxiv.org/abs/2409.01434) | yes | — |
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| [EVA](https://arxiv.org/abs/2409.07871) | no | — |
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| [AntiPaSTO](https://arxiv.org/abs/2503.08696) | no | — |
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Our test setup: We take Qwen3-0.6B-Base and train one MetaMathQA for 5000 steps. We use a rank of 32, and itnervene on all linear layer then test on GSM8K.
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Is this a good accuracy? TODO we need a like-for-like comparison against PEFT LoRA in the same setup before drawing conclusions. But the [PEFT library](https://github.com/huggingface/peft#results) reports LoRA at 49.0% on Llama-3.2-3B (different model and sample count).
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## Developer docs
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See [docs/developer_guide.md](docs/developer_guide.md) for the variant API, data-calibrated init, and save/load format.
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## Citation
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```bibtex
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@misc{wassname2026loralite,
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title = {LoRA-Lite: A Hackable Adapter Library for Research},
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author = {Michael J. Clark},
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year = {2026},
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url = {https://github.com/wassname/lora-lite/}
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}
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```
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