transformers gguf merge mergekit lazymergekit teknium/OpenHermes-2.5-Mistral-7B en base_model:IsakNordgren/OpenHermes-2.5-Mistral-7B-x2 base_model:quantized:IsakNordgren/OpenHermes-2.5-Mistral-7B-x2 endpoints_compatible region:us conversational