* The error appears in the proof. More specifically, the proof of
"section 3, Theorem 3.9" in the appendix has an error (c.f. Lemma B.4). Also
some errors in "section 4, experiment". We have a new version
arXiv:1806.00458 Access Paper or Ask Questions
* Proceedings of the 35th International Conference on Machine
Learning (ICML2018), Stockholm, Sweden, PMLR 80, 2018 * Accepted at ICML 2018 Access Paper or Ask Questions
* arXiv admin note: text overlap with arXiv: 1802.02339; correct typos,
improve proof and add experiments on real datasets Access Paper or Ask Questions