I thought the training images were unlabeled. See the actual paper: http://research.google.com/pubs/pub38115.html http://research.google.com/pubs/pub38115.html

I thought the training images were unlabeled. See the actual paper: http://research.google.com/pubs/pub38115.html http://research.google.com/pubs/pub38115.html "Abstract: We consider the problem of building highlevel, class-specific feature detectors from only unlabeled data."