%%%%BP Training for MIMO and Multi---samples
clear all
close all
clc
xite=0.5;
alfa=0.05;
w2=rands(6,2);
w2_1=w2;
w2_2=w2_1;
w1=rands(3,6);
w1_1=w1;
w1_2=w1;
dw1=0*w1;
I=[0 0 0 0 0 0]';
Iout=[0 0 0 0 0 0]';
FI=[0 0 0 0 0 0]';
OUT=2;
k=0;
E=1.0;
NS=3;
while E>=1e-20
k=k+1;
times(k)=k;
for s=1:NS
xs=[1 0 0;
0 1 0;
0 0 1];
ys=[1 0;
0 0.5;
0 1];
x=xs(s,:);
for j=1:6
I(j)=x*w1(:,j);
Iout(j)=1/(1+exp(-I(j)));
end
yl=w2'*Iout;
yl=yl';
el=0;
y=ys(s,:);
for l=1:OUT
el=el+0.5*(y(l)-yl(l))^2;
end
% es(s)=el;
E=0;
if s==NS
for s=1:NS
E=E+el;
end
end
el=y-yl;
w2=w2_1+xite*Iout*el+alfa*(w2_1-w2_2);
for j=1:6
S=1/(1+exp(-I(j)));
FI(j)=S*(1-S);
end
for i=1:3
for j=1:6
dw1(i,j)=xite*FI(j)*x(i)*(el(1)*w2(j,1)+el(2)*w2(j,2));
end
end
w1=w1_1+dw1+alfa*(w1_1-w1_2);
w1_2=w1_1;
w1_1=w1;
w2_2=w2_1;
w2_1=w2;
end
Ek(k)=E;
end
figure(1)
plot(times,Ek,'r')
xlabel('k')
ylabel('E')
save wfile w1 w2;
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