transformers reasoning preference_learning nca en dataset:openbmb/UltraInteract_sft dataset:openbmb/UltraInteract_pair dataset:openbmb/UltraFeedback base_model:openbmb/Eurux-8x22b-nca base_model:finetune:openbmb/Eurux-8x22b-nca license:apache-2.0 endpoints_compatible region:us