transformers safetensors stablelm text-generation mergekit merge conversational arxiv:2311.03099 arxiv:2306.01708 base_model:Aspik101/stable_ft6 base_model:merge:Aspik101/stable_ft6 base_model:abc88767/2c75 base_model:merge:abc88767/2c75 autotrain_compatible endpoints_compatible region:us