Hi there,
@bodokaiser,   Did you find what the problem is with your implementation ? I spent a week on your code and tried to get reasonable results from your UNet implementation, and the same blank prediction maps are the best I’ve got!!
On the hands, I have another Theano implementation of UNet which produces the claimed results. So, I tried to make the training stages equal for the both implementation (e.g. fixed data, fixed hyper-parameters and so on), but again blank maps with PyTorch!!