[Fix] Discard bboxes with sizes equals to min_bbox_size #5011
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As described in #5005, sometimes anchor heads may produce proposals with
area == 0
, which brings errors during mask prediction (masks can not be predicted when the areas of bboxes are 0). A possible solution is settingmin_bbox_size
to a value larger than 0, but I suggest simply discarding all the proposals witharea == min_bbox_size
in anchor heads directly.