svmmulticlassoneagainstone.m

各种SVM分类算法

function [xsup,w,b,nbsv,classifier,pos,obj]=svmmulticlassoneagainstone(x,y,nbclass,c,epsilon,kernel,kerneloption,verbose,warmstart);
xsup=[]; 
w=[];
b=[];
pos=[];
SigmaOut=[];
span=1;
classifier=[];
nbsv=zeros(1,nbclass);
nbsuppvector=zeros(1,nbclass);
k=1;
    Kaux=kerneloption.matrix;
    kernelparam=1;
    xapp=[];

obj=0;
for i=1:nbclass-1
    for j=i+1:nbclass
        indi=find(y==i);
        indj=find(y==j);
        yone=[ones(length(indi),1);-ones(length(indj),1)];      
        alphainit=[];
        kerneloption.matrix=Kaux([indi  ;indj],[indi; indj]);
        [xsupaux,waux,baux,posaux,timeaux,alphaaux,objaux]=svmclass(xapp,yone,c,epsilon,kernel,kerneloption,verbose,span,alphainit);
        [n1,n2]=size(waux);
        nbsv(k)=n1;
        classifier(k,:)=[i j];
        xsup=[xsup;xsupaux];
        w=[w;waux];
        b=[b;baux];
        aux=[indi;indj];
        pos=[pos;aux(posaux)];
        obj=obj+objaux;
        k=k+1;
    end;
end;