@article{differentiabletopkoperatorwithoptimal,
  title = {Differentiable Top-k Operator with Optimal Transport},
  author = {Yujia Xie and Hanjun Dai and Minshuo Chen and Bo Dai and Tuo Zhao and Hongyuan Zha and Wei Wei and Tomas Pfister},
  year = {2020},
  eprint = {2002.06504},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2002.06504v2},
}