YOLOv3 evaluation on custom dataset

Gluon
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Hi there, I prepared a custom dataset of vehicle detection using voc2007 format. It can be correctly read using VOCLike() API, but when I use the eval_yolov3.py sample code to evaluate the result, my MAP went extremely low. I cannot find out the reason. Any help would be appreciated, Thanks.

this is code I used to load and visualize one sample in my dataset

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visualization result
viz

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detection result using demo_yolo.py
test

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evaluation result using eval_yolo.py
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