transformers safetensors mistral text-generation mergekit merge base_model:HuggingFaceH4/mistral-7b-grok base_model:merge:HuggingFaceH4/mistral-7b-grok base_model:OpenPipe/mistral-ft-optimized-1218 base_model:merge:OpenPipe/mistral-ft-optimized-1218 autotrain_compatible text-generation-inference endpoints_compatible region:us