transformers pytorch safetensors llama text-generation medical health llama2 en dataset:bigbio/med_qa dataset:medmcqa dataset:bigbio/pubmed_qa dataset:epfl-llm/guidelines arxiv:2311.16079 base_model:meta-llama/Llama-2-70b license:llama2 autotrain_compatible text-generation-inference endpoints_compatible region:us