gguf facebook meta pytorch llama llama-3 quantized GGUF quantization imat imatrix static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation en base_model:meta-llama/Llama-Guard-3-8B base_model:quantized:meta-llama/Llama-Guard-3-8B license:llama3.1 region:us