@inproceedings{signsgdviazerothorderoracle,
  title = {signSGD via Zeroth-Order Oracle},
  author = {Sijia Liu and Pin-Yu Chen and Xiangyi Chen and Mingyi Hong},
  year = {2019},
  booktitle = {ICLR 2019 5},
  url = {https://openreview.net/forum?id=BJe-DsC5Fm},
}