In single shot detector the matching strategy between ground truth and predicted box starts with the following step:

For each ground truth box we are selecting from default boxes that vary over location, aspect ratio, and scale. We begin by matching each ground truth box to the default box with the best jaccard overlap

What if two or more ground truth box is matched to the same default box? Should some check exist to make sure that each default box is matched to at most one ground truth box?


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