transformers safetensors llama text-generation llama-2 conversational code arxiv:2308.12950 base_model:codellama/CodeLlama-70b-Instruct-hf base_model:quantized:codellama/CodeLlama-70b-Instruct-hf license:llama2 autotrain_compatible text-generation-inference 4-bit awq region:us