transformers gguf moe merge mergekit HuggingFaceH4/zephyr-7b-beta mistralai/Mistral-7B-Instruct-v0.2 teknium/OpenHermes-2.5-Mistral-7B meta-math/MetaMath-Mistral-7B Mistral en license:apache-2.0 endpoints_compatible region:us conversational