transformers safetensors mistral text-generation openchat C-RLFT conversational arxiv:2309.11235 arxiv:2303.08774 base_model:mistralai/Mistral-7B-v0.1 base_model:finetune:mistralai/Mistral-7B-v0.1 license:apache-2.0 model-index autotrain_compatible text-generation-inference endpoints_compatible region:us