transformers pytorch mistral text-generation nm-vllm sparse conversational arxiv:2301.00774 base_model:teknium/OpenHermes-2-coder-Mistral-7B-v2-e4 base_model:finetune:teknium/OpenHermes-2-coder-Mistral-7B-v2-e4 autotrain_compatible text-generation-inference endpoints_compatible region:us