transformers pytorch safetensors llama text-generation conversational hu en dataset:HuggingFaceH4/ultrachat_200k dataset:HuggingFaceH4/ultrafeedback_binarized dataset:HuggingFaceH4/cai-conversation-harmless license:llama2 autotrain_compatible text-generation-inference endpoints_compatible 4-bit exl2 region:us