Does the evaluateDe​tectionPre​cision function use the 11-point method to calculate mAP?

2021 10 30
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更新时间：2021 11 12
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Ok, so I found the answer.
Apparently, Pascal VOC calculation changed over the years. It started as calculating mAP using 11 points for the precision-recall curve, and after some years, it changed to using all the unique points. So, if for the validation dataset, 120 points were originated for the precision-recall curve, those 120 points will also be used to calculate mAP, which corresponds to the AUC, in this case.
Short answer: No, it does not use the 11 point method. It uses the total number of unique points to calculate mAP.

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yanqi liu
yanqi liu 2021-11-5

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sir，its compute rule as follows
precision = tp ./ (tp + fp);
recall = tp ./ numExpected;
% Change in recall for every true positive.
deltaRecall = 1/numExpected;
ap = sum( precision .* (labels>0) ) * deltaRecall;

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Hi,
What does the numExpected represent? Is the ap calculated using all the point where the detector made inference?
Thanks in advance.
yanqi liu
yanqi liu 2021-11-10
sir, i think numExpected is the ideal or expect number return, offen use in recall

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