ARTICLE Hsieh_TSP_2018/IDIAP A Non-Euclidean Gradient Descent Framework for Non-Convex Matrix Factorization Hsieh, Ya-Ping Kao, Yu-Chun Karimi Mahabadi, Rabeeh Yurtsever, Alp Kyrillidis, Anastasios Cevher, Volkan EXTERNAL http://publications.idiap.ch/attachments/papers/2019/Hsieh_TSP_2018.pdf PUBLIC IEEE Transactions on Signal Processing 2018