transformers safetensors gemma text-generation mergekit merge conversational arxiv:2306.01708 base_model:deepnetguy/gemma-70 base_model:merge:deepnetguy/gemma-70 base_model:zzttbrdd/sn6_20_new base_model:merge:zzttbrdd/sn6_20_new autotrain_compatible text-generation-inference endpoints_compatible region:us