Solved by ptrblck in post #2 
              
              
                floor + 1 is different to ceil for the case of a zero, which is needed in the calculation: 
floor(0) + 1 = 1, while ceil(0) = 0 


We subtract 1 in the numerator. Have a look at the Conv arithmetic to derive the formula. Basically if you reformulate the dilated conv output shape formula, you’ll ge…