gguf facebook meta pytorch llama llama-3 text-generation en arxiv:2407.21783 arxiv:2312.06674 arxiv:2204.05862 arxiv:2308.01263 base_model:meta-llama/Llama-3.1-8B base_model:quantized:meta-llama/Llama-3.1-8B license:llama3.1 region:us