•Define a “least squares”
error term
•E = S(t – o)2
•Use calculus to
determine how this error term is changed by a weight change
•Use this information to
define the fastest decrease in error possible
•For f(net) =
1/1+exp(-net):
•Wij(new) = Wij(old) + h(tj – oj)f’(net)ai
•Wij(new) = Wij(old) + h(tj – oj)(ai)(1 - ai)ai