Huang, X., R. Xu, H. Zhou, Z. Wang, Z. Liu, and L. Li. “ACMo: Angle-Calibrated Moment Methods for Stochastic Optimization”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 9, May 2021, pp. 7857-64, https://ojs.aaai.org/index.php/AAAI/article/view/16959.