@article{commentonallopticalmachinelearningusing,
  title = {Comment on "All-optical machine learning using diffractive deep neural networks"},
  author = {Haiqing Wei and Gang Huang and Xiuqing Wei and Yanlong Sun and Hongbin Wang},
  year = {2018},
  eprint = {1809.08360},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1809.08360v2},
}