HelpSteer 2: Open-source dataset for training top-performing reward models - Wang, Zhilin; Dong, Yi; Delalleau, Olivier; Zeng, Jiaqi; Shen, Gerald; Egert, Daniel; Zhang, Jimmy J.; Sreedhar, Makesh Narsimhan; Kuchaiev, Oleksii (Advances in Neural Information Processing Systems, 2024)