gusucode.com > 《matlab在数学建模中的应用》一书 所有的 源代码 > 第5章/P5-2/PSOTrain.m
function [NewW1,NewB1,NewW2,NewB2]=PSOTrain(SamIn,SamOut,HiddenUnitNum); Maxgeneration=700; E0=0.0001; Xmin=-10; Xmax=10; Vmin=-5; Vmax=5; M=100; c1=2.7; c2=1.3; w=0.9; [R,SamNum]=size(SamIn); [S2,SamNum]=size(SamOut); generation=1; Done=0; Pb1=zeros(HiddenUnitNum,R+S2+1,M); Pb2=zeros(S2,M); Pg1=zeros(HiddenUnitNum,R+S2+1); Pg2=zeros(S2,1); E=zeros(size(SamOut)); rand('state',sum(100*clock)); startP1=rand(HiddenUnitNum,R+S2+1,M)-0.5; startP2=rand(S2,M)-0.5; startV1=rand(HiddenUnitNum,R+S2+1,M)-0.5; startV2=rand(S2,M)-0.5; endP1=zeros(HiddenUnitNum,R+S2+1,M); endP2=zeros(S2,M); endV1=zeros(HiddenUnitNum,R+S2+1,M); endV2=zeros(S2,M); startE=zeros(1,M); endE=zeros(1,M); for i=1:M W1=startP1(1:HiddenUnitNum,1:R,i); W2=startP1(1:HiddenUnitNum,R+1:R+S2,i); B1=startP1(1:HiddenUnitNum,R+S2+1,i); B2=startP2(1:S2,i); for q=1:SamNum TempOut=logsig(W1*SamIn(:,q)+B1); NetworkOut(1,q)=W2'*TempOut+B2; end E=NetworkOut-SamOut; startE(1,i)=sumsqr(E)/(SamNum*S2); Pb1(:,:,i)=startP1(:,:,i); Pb2(:,i)=startP2(:,i); end [val,position]=min(startE(1,:)); Pg1=startP1(:,:,position); Pg2=startP2(:,position); Pgvalue=val; Pgvalue_last=Pgvalue; while(~Done) for num=1:M endV1(:,:,num)=w*startV1(:,:,num)+c1*rand*(Pb1(:,:,num)-startP1(:,:,num))+c2*rand*(Pg1-startP1(:,:,num)); endV2(:,num)=w*startV2(:,num)+c1*rand*(Pb2(:,num)-startP2(:,num))+c2*rand*(Pg2-startP2(:,num)); for i=1:HiddenUnitNum for j=1:(R+S2+1) endV1(i,j,num)=endV1(i,j,num); if endV1(i,j,num)>Vmax endV1(i,j,num)=Vmax; elseif endV1(i,j,num)<Vmin endV1(i,j,num)=Vmin; end end end for s2=1:S2 endV2(s2,num)=endV2(s2,num); if endV2(s2,num)>Vmax endV2(s2,num)=Vmax; elseif endV2(s2,num)<Vmin endV2(s2,num)=Vmin; end end endP1(:,:,num)=startP1(:,:,num)+endV1(:,:,num); endP2(:,num)=startP2(:,num)+endV2(:,num); for i=1:HiddenUnitNum for j=1:(R+S2+1) if endP1(i,j,num)>Xmax endP1(i,j,num)=Xmax; elseif endP1(i,j,num)<Xmin endP1(i,j,num)=Xmin; end end end for s2=1:S2 if endP2(s2,num)>Xmax endP2(s2,num)=Xmax; elseif endP2(s2,num)<Xmin endP2(s2,num)=Xmin; end end W1=endP1(1:HiddenUnitNum,1:R,num); W2=endP1(1:HiddenUnitNum,R+1:R+S2,num); B1=endP1(1:HiddenUnitNum,R+S2+1,num); B2=endP2(1:S2,num); for q=1:SamNum TempOut=logsig(W1*SamIn(:,q)+B1); NetworkOut(1,q)=W2'*TempOut+B2; end E=NetworkOut-SamOut; SSE=sumsqr(E) %便于在命令窗口观察网络误差的变化情况 endE(1,num)=sumsqr(E)/(SamNum*S2); if endE(1,num)<startE(1,num) Pb1(:,:,num)=endP1(:,:,num); Pb2(:,num)=endP2(:,num); startE(1,num)=endE(1,num); end end w=0.9-(0.5/Maxgeneration)*generation; [value,position]=min(startE(1,:)); if value<Pgvalue Pg1=Pb1(:,:,position); Pg2=Pb2(:,position); Pgvalue=value; end if (generation>=Maxgeneration) Done=1; end if Pgvalue<E0 Done=1; end startP1=endP1; startP2=endP2; startV1=endV1; startV2=endV2; startE=endE; generation=generation+1; end W1=Pg1(1:HiddenUnitNum,1:R); W2=Pg1(1:HiddenUnitNum,R+1:R+S2); B1=Pg1(1:HiddenUnitNum,R+S2+1); B2=Pg2(:,1); NewW1=W1; NewW2=W2; NewB1=B1; NewB2=B2;