BP Algorithm The BP Algorithm for the learning process of Multilayer networks The error signal of the th output is: e,(n)=d,(n)-y,(n) The instantaneous summed squared error of the output is: m=∑em The objective function of learning process is: Hn()BP Algorithm ◼ The BP Algorithm for the learning process of Multilayer networks The error signal of the jth output is: The instantaneous summed squared error of the output is: The objective function of learning process is: e (n) d (n) y (n) j = j − j =  j E n e j (n) 2 1 ( ) 2 = = N n AV E n N E 1 ( ) 1