MAT之SVM：SVM之分類預測根據已有大量資料集案例，輸入已有病例的特征向量實作乳腺癌診斷高準确率預測

輸出結果

代碼設計

load BreastTissue_data.mat

n = randperm(size(matrix,1));  

train_matrix = matrix(n(1:80),:);

train_label = label(n(1:80),:);

test_matrix = matrix(n(81:end),:);

test_label = label(n(81:end),:);

[Train_matrix,PS] = mapminmax(train_matrix');  

Train_matrix = Train_matrix';

Test_matrix = mapminmax('apply',test_matrix',PS);

Test_matrix = Test_matrix';

[c,g] = meshgrid(-10:0.2:10,-10:0.2:10);

[m,n] = size(c);

cg = zeros(m,n);

eps = 10^(-4);

v = 5;

bestc = 1;

bestg = 0.1;

bestacc = 0;

for i = 1:m  

   for j = 1:n

       cmd = ['-v ',num2str(v),' -t 2',' -c ',num2str(2^c(i,j)),' -g ',num2str(2^g(i,j))];

       cg(i,j) = svmtrain(train_label,Train_matrix,cmd);    

       if cg(i,j) > bestacc  

           bestacc = cg(i,j);

           bestc = 2^c(i,j);

           bestg = 2^g(i,j);

       end      

       if abs( cg(i,j)-bestacc )<=eps && bestc > 2^c(i,j)

       end              

   end

end

cmd = [' -t 2',' -c ',num2str(bestc),' -g ',num2str(bestg)]; %

model = svmtrain(train_label,Train_matrix,cmd);

[predict_label_1,accuracy_1] = svmpredict(train_label,Train_matrix,model);

[predict_label_2,accuracy_2] = svmpredict(test_label,Test_matrix,model);

result_1 = [train_label predict_label_1];

result_2 = [test_label predict_label_2];

figure

plot(1:length(test_label),test_label,'r-*')

hold on

plot(1:length(test_label),predict_label_2,'b:o')

grid on

legend('真實類别','預測類别')

xlabel('乳腺樣本測試集樣本編号')

ylabel('乳腺樣本測試集樣本類别')

string = {'乳腺樣本測試集與SVM算法預測乳腺病例結果對比(RBF核函數)—Jason niu';

         ['accuracy = ' num2str(accuracy_2(1)) '%']};

1

% title(string)