Ma, Ke, Jinshan Zeng, Jiechao Xiong, Qianqian Xu, Xiaochun Cao, Wei Liu, and Yuan Yao. 2018. “Stochastic Non-Convex Ordinal Embedding With Stabilized Barzilai-Borwein Step Size”. Proceedings of the AAAI Conference on Artificial Intelligence 32 (1). https://ojs.aaai.org/index.php/AAAI/article/view/11599.