@article{multisourceunsupervisedhyperparameter,
  title = {Efficient Hyperparameter Optimization under Multi-Source Covariate Shift},
  author = {Masahiro Nomura and Yuta Saito},
  year = {2020},
  eprint = {2006.10600},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2006.10600v2},
}