Add rotation support in detector train mode

[robosina]

I have added rotation support in detection mode, if anyone wants to have rotation then you can add angle_detector in cfg file, for example I want to have rotation between [-20,20] then I will add the argument like the below :

 [net]
 batch=64
 subdivisions=8
 .
 .
 angle_detector = 20

Then images will be rotated randomly between [-20,20]

Note that this will be works if you compiled with opencv.

[lcy0604]

Hello, thanks for your work! I am also interested in the support for rotated bounding boxes. Can your code support all angle (-180~180) prediction?

[syjeon121]

@robosina hello, thanks for your works
applying your code and testing, result is not good. unlike previous training, mAP dose not rise.
are you working well?