@article{preconditionedstochasticgradientdescent,
  title = {Preconditioned Stochastic Gradient Descent},
  author = {Xi-Lin Li},
  year = {2015},
  eprint = {1512.04202},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1512.04202v3},
}