@article{dualityfreemethodsforstochastic,
  title = {Duality-free Methods for Stochastic Composition Optimization},
  author = {Liu Liu and Ji Liu and DaCheng Tao},
  year = {2017},
  eprint = {1710.09554},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1710.09554v1},
}