meanIOU after every epoch for PascalVOC

[Ekta246]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is.
Since, I am not able to understand why my mAP is 0 in every epoch, I would like to quantify the mean IOU of the class over each epoch. If you could direct me and you think you already do that in the code.
Describe the solution you'd like
A clear and concise description of what you want to happen.
np.avg(iou_arrays)
Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[rwightman]

not going to do this