Solved by vfdev-5 in post #2 
              
              
                Output is what is returned by evaluator’s process_function :  https://pytorch.org/ignite/metrics.html 

I’m using BCEWithLogitsLoss, so I have to pass logits through a sigmoid function. I have to use a sigmoid here as well, right? 

Well, it depends on your choice how to define whether logit’s value…