@inproceedings{hierarchicalsubtaskdiscoverywithnon,
  title = {Hierarchical Subtask Discovery With Non-Negative Matrix Factorization},
  author = {Adam C. Earle and Andrew M. Saxe and Benjamin Rosman},
  year = {2017},
  booktitle = {ICLR 2018 1},
  eprint = {1708.00463},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1708.00463v1},
}