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# SpQR

[SpQR](https://github.com/Vahe1994/SpQR) quantization algorithm involves a 16x16 tiled bi-level group 3-bit quantization structure, with sparse outliers as detailed in [SpQR: A Sparse-Quantized Representation for Near-Lossless LLM Weight Compression](https://arxiv.org/abs/2306.03078).

To SpQR-quantize a model, refer to the [Vahe1994/SpQR](https://github.com/Vahe1994/SpQR) repository.

Load a pre-SpQR-quantized model in [`~PreTrainedModel.from_pretrained`].

```python
from transformers import AutoTokenizer, AutoModelForCausalLM
import torch

quantized_model = AutoModelForCausalLM.from_pretrained(
    "elvircrn/Llama-2-7b-SPQR-3Bit-16x16-red_pajama-hf",
    torch_dtype=torch.half,
    device_map="auto"
)
tokenizer = AutoTokenizer.from_pretrained("elvircrn/Llama-2-7b-SPQR-3Bit-16x16-red_pajama-hf")
```