The metric computation of an image object detection and instance segmentation model is based on an overlap measurement defined by a metric called **IoU** ([Intersection over Union](https://en.wikipedia.org/wiki/Jaccard_index)) which is computed by dividing the area of overlap between the ground-truth and the predictions by the area of union of the ground-truth and the predictions. The IoU computed from every prediction is compared with an **overlap threshold** called an IoU threshold, which determines how much a prediction should overlap with a user-annotated ground-truth in order to be considered as a positive prediction. If the IoU computed from the prediction is less than the overlap threshold the prediction wouldn't be considered as a positive prediction for the associated class.
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