transformers safetensors gemma text-generation mergekit merge conversational arxiv:2306.01708 base_model:coffiee/g2 base_model:merge:coffiee/g2 base_model:coffiee/g3 base_model:merge:coffiee/g3 base_model:coffiee/g4 base_model:merge:coffiee/g4 autotrain_compatible text-generation-inference endpoints_compatible region:us