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I am training some Object-Detection-Models from the TensorFlow Object Detection API and got from the evaluation with MS COCO metrics the following results for Average Precision:

IoU = 0.5;0.9 maxDets = 100 area = small AP = -1.000

The other values all make sense to me. But I don´t know what the -1.000 stands for. Does it mean that there are no small objects in my dataset to be detected?

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APsmall stands for Average Precision for small objects.


This website contains all the descriptions about the metrics: https://cocodataset.org/#detection-eval

If you want to know more about the metrics evaluation (how to calculate this metric), you can find the metric's source code here: https://github.com/cocodataset/cocoapi/blob/master/PythonAPI/pycocotools/cocoeval.py

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