can you please explain what does happens here? self.cfg = (coco, voc)[num_classes == 21]
when num_classes is 21, self.cfg=(coco,voc)[1], namely, self.cfg=voc when num_class is not 21, self.cfg=(coco,voc)[0], namely self.cfg=coco
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when num_classes is 21, self.cfg=(coco,voc)[1], namely, self.cfg=voc
when num_class is not 21, self.cfg=(coco,voc)[0], namely self.cfg=coco