D. Diochnos, S. Mahloujifar, and M. Mahmoody. (2018)cite arxiv:1810.12272Comment: Full version of a work with the same title that will appear in NIPS 2018, 31 pages containing 5 figures, 1 table, 2 algorithms.
N. Konstantinov, and C. Lampert. (2019)cite arxiv:1901.10310Comment: Accepted to International Conference on Machine Learning (ICML), 2019; Camera-ready version.