Comments (1)
hi, first line means check the IOU between ground truth bounding boxes and predicted ones. second line means find the maximum IOU. third line means if the max IOU is smaller than the predefined threshold, then consider them as no object ones. so finally calculate the loss as object + no object. object: the objectness score should be 1. no object: the objectness score should be 0. The loss follows focal loss type instead of BCE loss.
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