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I have been trying to find an answer online but I couldn't really find one. If anyone could help me I would appreciate it

StrickBan
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    Do you have a reference saying that? Maybe I'm missing some context, but intersection over union is discrete, so treating it as a function of the weights it's piecewise-constant, so of course it's not differentiable? – Ben Reiniger Oct 16 '20 at 13:35

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Intersection over Union (IoU) can be differentiable. The paper "UnitBox: An Advanced Object Detection Network" by Yu et al. describes it detail.

Brian Spiering
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