Feed-forward example 3 W* W35 5 W23 W 4 W45 Feed-forward network=a parameterized family of nonlinear functions: a5=g(W3,5·a3+W4,5·a4) =g(W3,5·g(W,3·a1+W2,3·a2)+W4,5·g(W,4·a1+W2,4·a2) Adjusting weights changes the function:do learning this way! Chapter 20,Section 5 8 Feed-forward example W1,3 W1,4 W2,3 W2,4 W3,5 W4,5 1 2 3 4 5 Feed-forward network = a parameterized family of nonlinear functions: a5 = g(W3,5 · a3 + W4,5 · a4) = g(W3,5 · g(W1,3 · a1 + W2,3 · a2) + W4,5 · g(W1,4 · a1 + W2,4 · a2)) Adjusting weights changes the function: do learning this way! Chapter 20, Section 5 8