transformers safetensors gemma text-generation mergekit merge arxiv:2203.05482 base_model:AlexxxSem/gemma2b-dolly15k-r128 base_model:merge:AlexxxSem/gemma2b-dolly15k-r128 base_model:unsloth/gemma-2b base_model:merge:unsloth/gemma-2b autotrain_compatible text-generation-inference endpoints_compatible region:us