def bbox_decode(self, bbox_preds, anchors):
    'decode bbox from deltas\n        Args:\n            bbox_preds: [N,H,W,5]\n            anchors: [H*W,5]\n        return:\n            bboxes: [N,H,W,5]\n        '
    (num_imgs, H, W, _) = bbox_preds.shape
    bbox_delta = paddle.reshape(bbox_preds, [(- 1), 5])
    bboxes = self.delta2rbox(anchors, bbox_delta)
    return bboxes
decode bbox from deltas
Args:
    bbox_preds: [N,H,W,5]
    anchors: [H*W,5]
return:
    bboxes: [N,H,W,5]
def bbox_decode(self, bbox_preds, anchors):
    'decode bbox from deltas\n        Args:\n            bbox_preds: [N,H,W,5]\n            anchors: [H*W,5]\n        return:\n            bboxes: [N,H,W,5]\n        '
    (num_imgs, H, W, _) = bbox_preds.shape
    bbox_delta = paddle.reshape(bbox_preds, [(- 1), 5])
    bboxes = self.delta2rbox(anchors, bbox_delta)
    return bboxes