Ptr<SVM> svm = SVM::create();
svm->setType(SVM::C_SVC);
svm->setKernel(3);
svm->setDegree(3); // have to set the param, runtime error
svm->setTermCriteria(TermCriteria(TermCriteria::MAX_ITER + TermCriteria::EPS, 1000, 0.01));
svm->trainAuto(_Samples, 10, SVM::getDefaultGrid(SVM::C), SVM::getDefaultGrid(SVM::GAMMA),
SVM::getDefaultGrid(SVM::P), SVM::getDefaultGrid(SVM::NU), SVM::getDefaultGrid(SVM::COEF),
SVM::getDefaultGrid(SVM::DEGREE), true);
svm->predict(Test, results);
using LIBSVM with sigmoid can achieve 86% of accuracy, but using cv can only get about 40%. what's wrong with my code?
