假如以voc为例

1. {0: ‘person’, 1: ‘aeroplane’, 2: ‘tvmonitor’, 3: ‘train’, 4: ‘boat’, 5: ‘dog’, 6: ‘chair’, 7: ‘bird’, 8: ‘bicycle’, 9: ‘bottle’, 10: ‘sheep’, 11: ‘diningtable’, 12: ‘horse’, 13: ‘motorbike’, 14: ‘sofa’, 15: ‘cow’, 16: ‘car’, 17: ‘cat’, 18: ‘bus’, 19: ‘pottedplant’, 20: ‘bg’}

0/2510
chair AP: 0.28869047619047616
mAP = 0.28869047619047616

1/2510
chair AP: 0.28869047619047616
car AP: 1.0
pottedplant AP: nan
mAP = nan

2/2510
Elapsed time = 1.9220726490020752
chair AP: 0.28869047619047616
car AP: 1.0
pottedplant AP: nan
person AP: 0.5333333333333333
cow AP: nan
horse AP: 1.0
mAP = nan
3/2510
Elapsed time = 3.110313653945923
chair AP: 0.28869047619047616
car AP: 1.0
pottedplant AP: nan
person AP: 0.5333333333333333
cow AP: nan
horse AP: 1.0
bicycle AP: 1.0
aeroplane AP: nan
mAP = nan
4/2510
Elapsed time = 1.8914203643798828
chair AP: 0.28869047619047616
car AP: 1.0
pottedplant AP: nan
person AP: 0.5333333333333333
cow AP: nan
horse AP: 1.0
bicycle AP: 1.0
aeroplane AP: nan
dog AP: nan
cat AP: 0.6666666666666666
mAP = nan

47/2510
Elapsed time = 1.937781810760498

1 chair AP: 0.12772727272727274
2 car AP: 0.6308558522374312
3 potted plant AP: 0.4619528619528619
4 person AP: 0.3995975413053875
5 cow AP: 1.0
6 horse AP: 0.6
7 bicycle AP: 0.45098039215686275
8 aeroplane AP: 1.0
9 dog AP: 0.34258357922091986
10cat AP: 0.7714285714285716
11boat AP: 0.25
12train AP: 0.3563157894736842
13tvmonitor AP: 0.7430555555555556
14bird AP: 0.1216931216931217
15bottle AP: 0.3346897546897547
16diningtable AP: 0.09090909090909091
17motorbike AP: 0.5333333333333333
18sofa AP: 0.575
19sheep AP: 0.14285714285714285
20bus AP: 1.0
mAP = 0.49664899297704956

往后测试叠加mAP有增有减少

400/2510
Elapsed time = 1.9222052097320557
chair AP: 0.15002981135775612
car AP: 0.43147473994561497
pottedplant AP: 0.11550974545698545
person AP: 0.4532716833282848
cow AP: 0.20213129235714683
horse AP: 0.3033517162481653
bicycle AP: 0.2879809918911016
aeroplane AP: 0.40038843767966387
dog AP: 0.2565255825543592
cat AP: 0.39053412517891983
boat AP: 0.17534188258274086
train AP: 0.362315881902097
tvmonitor AP: 0.32404569245135134
bird AP: 0.2653630196129552
bottle AP: 0.3249778718648044
diningtable AP: 0.17251826815981441
motorbike AP: 0.3575701706808387
sofa AP: 0.3063773117728696
sheep AP: 0.17317933651367756
bus AP: 0.4868833852350336
mAP = 0.29698854733870905

667/2510
Elapsed time = 1.9227213859558105
chair AP: 0.1640706171565236
car AP: 0.42469961073040874
pottedplant AP: 0.10295325698963322
person AP: 0.44358462811658356
cow AP: 0.1124236733663501
horse AP: 0.3205288273941021
bicycle AP: 0.28255813688774684
aeroplane AP: 0.2827354478630057
dog AP: 0.2191651692828227
cat AP: 0.40114303683986924
boat AP: 0.17086963889275
train AP: 0.276545735129519
tvmonitor AP: 0.35005133047681325
bird AP: 0.26132623340882993
bottle AP: 0.2827456682878616
diningtable AP: 0.1517175764303793
motorbike AP: 0.3199331710038957
sofa AP: 0.21300158188395243
sheep AP: 0.1552884051328735
bus AP: 0.3716882623279585
mAP = 0.265351500380094