Eq. (9) in your paper

[BingHan0458]

Hi, thanks for your great work. When the points of two point-sets are different, does your calc_dcd() correspond to equation 8 or equation 9 in your paper? "We use Eqn. 8 in training for the loss between the coarse shape with 1024 points and the ground truth with 2048 points for simplicity." If it is corresponding to equation 8, how to deal with it when the loss value is negative？ Looking forward to your replay.