transformers safetensors llama text-generation alignment-handbook dpo trl selm conversational dataset:HuggingFaceH4/ultrafeedback_binarized arxiv:2405.19332 base_model:meta-llama/Meta-Llama-3-8B-Instruct base_model:finetune:meta-llama/Meta-Llama-3-8B-Instruct license:mit autotrain_compatible text-generation-inference endpoints_compatible region:us