transformers safetensors gemma text-generation mergekit merge conversational arxiv:2306.01708 base_model:deepnetguy/gemma-127 base_model:merge:deepnetguy/gemma-127 base_model:tomaszki/gemma-42 base_model:merge:tomaszki/gemma-42 autotrain_compatible text-generation-inference endpoints_compatible region:us