gptq

# GPTQ (Generative Pre-trained Transformer Quantization) Post-training quantization method that compresses LLMs to 4-bit with minimal accuracy loss using group-wise quantization. ## When to use GPTQ **Use GPTQ when:** - Need to fit large models (70B+) on limited GPU memory - Want 4× memory reduction with <2% accuracy loss - Deploying on consumer GPUs (RTX 4090, 3090) - Need faster inference (3-4× speedup vs FP16) **Use AWQ instead when:** - Need slightly better accuracy (<1% loss) - Have newer GPUs (Ampere, Ada) - Want Marlin kernel support (2× faster on some GPUs) **Use bitsandbytes instead when:** - Need simple integration with transformers - Want 8-bit quantization (less compression, better quality) - Don't need pre-quantized model files ## Quick start ### Installation ```bash # Install AutoGPTQ pip install auto-gptq # With Triton (Linux only, faster) pip install auto-gptq[triton] # With CUDA extensions (faster) pip install auto-gptq --no-build-isolation # Full installation pip install auto-gptq transformers accelerate ``` ### Load pre-quantized model ```python from transformers import AutoTokenizer from auto_gptq import AutoGPTQForCausalLM # Load quantized model from HuggingFace model_name = "TheBloke/Llama-2-7B-Chat-GPTQ" model = AutoGPTQForCausalLM.from_quantized( model_name, device="cuda:0", use_triton=False # Set True on Linux for speed ) tokenizer = AutoTokenizer.from_pretrained(model_name) # Generate prompt = "Explain quantum computing"...