code explanation

[mechealww2]

I don' t understand why it doing this ' if odet == det:' ? Anyone can help？Thks
##############################################################################
for idet in range(0, ndets): # ndets number of detection method
det = dets[idet]
for box in det:
....
for iodet in range(0, ndets):
odet = dets[iodet]
if odet == det:
continue