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A problem when calculating mAP
See original GitHub issueIn the above code, I can’t understand the way to calculate old_precision. Here old_precision should be the precison of the last true-match, should it be changed like this?
old_precision = i*1.0/(rows_good[i-1] +1)
or just
...
ap = ap + d_recall*(old_precision + precision)/2
# Simplified from here `http://www.robots.ox.ac.uk/~vgg/data/oxbuildings/compute_ap.cpp`
old_precision = precision
Issue Analytics
- State:
- Created 5 years ago
- Comments:10 (3 by maintainers)
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I make a simple picture:
I thought it should be average of point 1 and point 3, in fact we should use point 2 and point 3.
Thanks for your patience @layumi.
我搞懂了，不是上一个匹配点，而是上一个rank对应的点。谢谢。