transformers safetensors llama text-generation medical conversational en dataset:lavita/AlpaCare-MedInstruct-52k arxiv:1910.09700 base_model:meta-llama/Llama-2-7b-chat-hf base_model:finetune:meta-llama/Llama-2-7b-chat-hf autotrain_compatible text-generation-inference endpoints_compatible region:us