transformers gguf mistral quantized 2-bit 3-bit 4-bit 5-bit 6-bit 8-bit GGUF pytorch safetensors llama text-generation arxiv:2309.12307 autotrain_compatible endpoints_compatible text-generation-inference region:us base_model:Yukang/LongAlpaca-13B base_model:quantized:Yukang/LongAlpaca-13B