@InProceedings{Wang_2021_CVPR,
    author    = {Wang, Xudong and Liu, Ziwei and Yu, Stella X.},
    title     = {Unsupervised Feature Learning by Cross-Level Instance-Group Discrimination},
    booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
    month     = {June},
    year      = {2021},
    pages     = {12586-12595}
}