transformers safetensors llama text-generation mergekit merge conversational arxiv:2311.03099 arxiv:2306.01708 base_model:meta-llama/Meta-Llama-3-70B-Instruct base_model:finetune:meta-llama/Meta-Llama-3-70B-Instruct autotrain_compatible text-generation-inference endpoints_compatible region:us