#precision-recall

Question 1: Short answer

A detector is evaluated on one class with 4 ground-truth objects, GT1 to GT4. Its six detections, sorted by confidence, are listed with the ground-truth box each overlaps most and that IoU:

rank	confidence	best ground truth	IoU
1	0.95	GT1	0.82
2	0.90	GT1	0.65
3	0.80	GT2	0.71
4	0.70	GT3	0.42
5	0.60	GT4	0.55
6	0.40	none	0

A detection is a true positive if its IoU is at least 0.5 and its ground truth has not already been matched by a higher-ranked detection; otherwise it is a false positive. AP is the sum of the precisions at the ranks of the true positives, divided by the number of ground-truth objects. What is AP?

Timed test