svmclass.m

模式识别中的一对一多类分类器

function [xsup,w,d,pos,timeps,alpha,obj]=svmclass(x,y,c,lambda,kernel,kerneloption,verbose,span, alphainit)
%svmclass函数用于求解QP问题
span=ones(size(y));
[na,m]=size(span);
[n un] = size(y);
A = (y*ones(1,m)).*span;
b = zeros(m,1);
[n un] = size(y);
ttt = cputime;
ps  =  zeros(n,n);		
%ps=svmkernel(x,kernel,kerneloption);
ps=kerneloption.matrix;
H =ps.*(y*y'); 
e = ones(size(y));
timeps = cputime - ttt;
[alpha , lambda , pos] = monqp(H,e,A,b,c,lambda,verbose,x,ps,alphainit);         
alphaall=zeros(size(e));
alphaall(pos)=alpha;
obj=-0.5*alphaall'*H*alphaall +e'*alphaall;
xsup=[];
ysup = y(pos);
w = (alpha.*ysup);
d = lambda;