Questions about the edge loss function.

Thanks for your work, may I ask why self.loss_fun2(HSI1, 1 - DSM) in HFSNet.py is subtracting DSM with 1, and it seems that DSM is not a tensor that contains only 0 or 1, but the DiceLoss function is set to mode='binary', so shouldn't DSM contain only 0 or 1? Looking forward to your answer, thanks.