H(:,1)=predict(gda_in, Xtrain);
H(:,2)=predict(knn_in, Xtrain);
H(:,3)=predict(nb_in, Xtrain);
H(:,4)=predict(linear_in, Xtrain);
H(:,5)=predict(svm_in, Xtrain);
ada_train(:,1)=sign(H*alpha');

% for test set
Htest(:,1)=predict(gda_in, Xtest);
Htest(:,2)=predict(knn_in, Xtest);
Htest(:,3)=predict(nb_in, Xtest);
Htest(:,4)=predict(linear_in, Xtest);
Htest(:,5)=predict(svm_in, Xtest);

ada_test(:,1)=sign(Htest*alpha');