If you are working on an object detection or instance segmentation algorithm, you have probably come across the messy pile of different kinds of performance metrics. There are AP, AP50, AP75, mAP, AP@[0.5:0.95], and all kinds of fun stuff. Researchers are actually inventing even more new metrics as we speak. Pretty soon you will be pulling your hair out and ask yourself what the **** is all this. “I have an algorithm, and I have my dataset. All I want to do is to evaluate it. Why is it so hard?” Well, I hav