transformers safetensors mistral text-generation mergekit merge conversational arxiv:2306.01708 base_model:HuggingFaceH4/zephyr-7b-beta base_model:merge:HuggingFaceH4/zephyr-7b-beta base_model:mlabonne/Mistralpaca-7B base_model:merge:mlabonne/Mistralpaca-7B autotrain_compatible text-generation-inference endpoints_compatible region:us