mystery code about IoU calculate ? about chainercv HOT 4 CLOSED

It calculates intersection over union between bounding boxes in bbox_a and bbox_b.
The formula to calculate IoU from a pair of bounding boxes can be found in the link below.

https://en.wikipedia.org/wiki/Jaccard_index

Perhaps, this is a little bit difficult to understand in the first hand because the code processes IoUs between collections of bounding boxes.

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A little bit? I must say you are really very powerful numpy user. very impressive code

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how to use numpy like you？ do you have any learning numpy suggestion？

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Thanks. This was a work by @Hakuyume .
It is always better to start from easy code and optimize it later.

If you have any more questions, please re-open this.

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