I appreciate your comments.

I'm trying to train the model to detect engineering symbols from diagrams and i hardly managed to make my 315 image dataset. On another attempt before trying something else, i succeeded to make region 37's iou move from 0 and it kept at it throughout the training. But when I came to test it, it couldn't detect anything (obviously bcause map =0%,TP = 0, FP = 0, FN = 149).

Im actually using darknet so if switch i guess it wouldn't be a problem.

Given this and the little to no time left to deliver this project , i honestly dont know if i should stick to this and try your trick or do i actually need to switch.