mean Average Precision - This code evaluates the performance of your neural net for object recognition.
This code will evaluate the performance of your neural net for object recognition.
In practice, a higher mAP value indicates a better performance of your neural net, given your ground-truth and set of classes.
This project was developed for the following paper, please consider citing it:
@INPROCEEDINGS{8594067,
author={J. {Cartucho} and R. {Ventura} and M. {Veloso}},
booktitle={2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)},
title={Robust Object Recognition Through Symbiotic Deep Learning In Mobile Robots},
year={2018},
pages={2336-2341},
}
The performance of your neural net will be judged using the mAP criterium defined in the PASCAL VOC 2012 competition. We simply adapted the official Matlab code into Python (in our tests they both give the same results).
First (1.), we calculate the Average Precision (AP), for each of the classes present in the ground-truth. Finally (2.), we calculate the mAP (mean Average Precision) value.
For each class:
First, your neural net detection-results are sorted by decreasing confidence and are assigned to ground-truth objects. We have "a match" when they share the same label and an IoU >= 0.5 (Intersection over Union greater than 50%). This "match" is considered a true positive if that ground-truth object has not been already used (to avoid multiple detections of the same object).
Using this criterium, we calculate the precision/recall curve. E.g:
Then we compute a version of the measured precision/recall curve with precision monotonically decreasing (shown in light red), by setting the precision for recall r
to the maximum precision obtained for any recall r' > r
.
Finally, we compute the AP as the area under this curve (shown in light blue) by numerical integration. No approximation is involved since the curve is piecewise constant.
We calculate the mean of all the AP's, resulting in an mAP value from 0 to 100%. E.g:
You need to install:
Optional:
python -mpip install -U pip
python -mpip install -U matplotlib
python -mpip install -U pip
python -mpip install -U opencv-python
To start using the mAP you need to clone the repo:
git clone https://github.com/Cartucho/mAP
Step by step:
python main.py
Optional (if you want to see the animation):
In the scripts/extra folder you can find additional scripts to convert PASCAL VOC, darkflow and YOLO files into the required format.
<class_name> <left> <top> <right> <bottom> [<difficult>]
difficult
parameter is optional, use it if you want the calculation to ignore a specific detection.tvmonitor 2 10 173 238
book 439 157 556 241
book 437 246 518 351 difficult
pottedplant 272 190 316 259
<class_name> <confidence> <left> <top> <right> <bottom>
tvmonitor 0.471781 0 13 174 244
cup 0.414941 274 226 301 265
book 0.460851 429 219 528 247
chair 0.292345 0 199 88 436
book 0.269833 433 260 506 336