transformers safetensors mistral text-generation alignment-handbook dpo trl selm conversational dataset:HuggingFaceH4/ultrafeedback_binarized arxiv:2405.19332 base_model:ZhangShenao/SELM-Zephyr-7B-iter-2 base_model:finetune:ZhangShenao/SELM-Zephyr-7B-iter-2 license:mit autotrain_compatible text-generation-inference endpoints_compatible region:us