@article{modelfreeunsupervisedlearningfor,
  title = {Model-Free Unsupervised Learning for Optimization Problems with Constraints},
  author = {Chengjian Sun and Dong Liu and Chenyang Yang},
  year = {2019},
  eprint = {1907.12706},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1907.12706v1},
}