DetectionTeamUCAS / DetectionTeamUCAS/RetinaNet_Tensorflow_Rotation

Gradient about IOU-Smooth L1 loss

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Description

here's the equation

![image](https://user-images.githubusercontent.com/28484395/121462520-4c4ff600-c9e3-11eb-83e1-debdf17962dd.png)

Let's let `Lreg` as `u` and `|-log(IoU)|` as `I`

![image](https://user-images.githubusercontent.com/28484395/121463142-0cd5d980-c9e4-11eb-8ff6-2e3ccedae27f.png)

@yangxue0827 I know there must be something wrong. So could you pleast tell the right wat to calculate the gradient?

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