why there are three classes in this model?

yeephycho / tensorflow-face-detection

A mobilenet SSD based face detector, powered by tensorflow object detection api, trained by WIDERFACE dataset.

Apache License 2.0

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why there are three classes in this model? #47

Open zbengang opened 5 years ago

zbengang commented 5 years ago

when I am trying to convert this model to caffemodel, I found there are three classes in this model. One for groundtruth, one for face, what's the third class for ?