Raindrop

@d-b-h I find the same issue in the in-painting code. In the code, the MSE is calculated by comparing `out*mask_var` and `img_var*mask_var`. But if we do that, we assume we...

@d-b-h The regularization didn't work. I have double checked the paper. In the paper the loss function is:  It assumes we know the what is the original image is....