5.9 () www The error function (5.21) for binary classification problems was derived for a network having a logistic-sigmoid output activation function, so that 0
y(x,w)
1, and data having target values t ∈ {0, 1}. Derive the corresponding error function if we consider a network having an output −1
y(x,w)
1 and target values t = 1 for class C1 and t = −1 for class C2. What would be the appropriate choice of output unit activation function?