The following figure shows the decision regions of four classes. Design a classifier for these linearly inseparable classes, using a network of M-P neurons with three output units. For class i (1 ≤ i ≤ 3), classification requires that yi = 1, while yj = -1 for j ≠ i; Class 4 is recognized when yi = -1 for 1 ≤ i ≤ 3. (HINT: try a two-layer feedforward network.)
X2 Class 1 Class 2 Class 3 Class 4 4 2