transformers gguf mistral quantized 2-bit 3-bit 4-bit 5-bit 6-bit 8-bit GGUF pytorch safetensors llama text-generation facebook meta llama-2 en arxiv:2307.09288 autotrain_compatible has_space text-generation-inference region:us base_model:meta-llama/Llama-2-7b-chat-hf base_model:quantized:meta-llama/Llama-2-7b-chat-hf license:apache-2.0