* This work was done when Yiming Li was an intern at Tencent AI Lab,
supported by the Tencent Rhino-Bird Elite Training Program (2020). This is a
6-pages short version of our ongoing work, `Rethinking the Trigger of
Backdoor Attack' (arXiv:2004.04692). It is accepted by the non-archival ICLR
2021 workshop on Robust and Reliable Machine Learning in the Real World.
arXiv admin note: substantial text overlap with arXiv:2004.04692 Access Paper or Ask Questions