@article{efficientlearningwitharbitrarycovariate,
  title = {Efficient Learning with Arbitrary Covariate Shift},
  author = {Adam Kalai and Varun Kanade},
  year = {2021},
  eprint = {2102.07802},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2102.07802v1},
}