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#include "test_precomp.hpp"
#include <cstdlib>
#include <cmath>
#include <algorithm>
static void mytest(cv::Ptr<cv::DownhillSolver> solver,cv::Ptr<cv::MinProblemSolver::Function> ptr_F,cv::Mat& x,cv::Mat& step,
cv::Mat& etalon_x,double etalon_res){
solver->setFunction(ptr_F);
int ndim=MAX(step.cols,step.rows);
solver->setInitStep(step);
cv::Mat settedStep;
solver->getInitStep(settedStep);
ASSERT_TRUE(settedStep.rows==1 && settedStep.cols==ndim);
ASSERT_TRUE(std::equal(step.begin<double>(),step.end<double>(),settedStep.begin<double>()));
std::cout<<"step setted:\n\t"<<step<<std::endl;
double res=solver->minimize(x);
std::cout<<"res:\n\t"<<res<<std::endl;
std::cout<<"x:\n\t"<<x<<std::endl;
std::cout<<"etalon_res:\n\t"<<etalon_res<<std::endl;
std::cout<<"etalon_x:\n\t"<<etalon_x<<std::endl;
double tol=1e-2;//solver->getTermCriteria().epsilon;
ASSERT_TRUE(std::abs(res-etalon_res)<tol);
/*for(cv::Mat_<double>::iterator it1=x.begin<double>(),it2=etalon_x.begin<double>();it1!=x.end<double>();it1++,it2++){
ASSERT_TRUE(std::abs((*it1)-(*it2))<tol);
}*/
std::cout<<"--------------------------\n";
}
class SphereF:public cv::MinProblemSolver::Function{
public:
int getDims() const { return 2; }
double calc(const double* x)const{
return x[0]*x[0]+x[1]*x[1];
}
};
class RosenbrockF:public cv::MinProblemSolver::Function{
int getDims() const { return 2; }
double calc(const double* x)const{
return 100*(x[1]-x[0]*x[0])*(x[1]-x[0]*x[0])+(1-x[0])*(1-x[0]);
}
};
TEST(Core_DownhillSolver, regression_basic){
cv::Ptr<cv::DownhillSolver> solver=cv::DownhillSolver::create();
#if 1
{
cv::Ptr<cv::MinProblemSolver::Function> ptr_F = cv::makePtr<SphereF>();
cv::Mat x=(cv::Mat_<double>(1,2)<<1.0,1.0),
step=(cv::Mat_<double>(2,1)<<-0.5,-0.5),
etalon_x=(cv::Mat_<double>(1,2)<<-0.0,0.0);
double etalon_res=0.0;
mytest(solver,ptr_F,x,step,etalon_x,etalon_res);
}
#endif
#if 1
{
cv::Ptr<cv::MinProblemSolver::Function> ptr_F = cv::makePtr<RosenbrockF>();
cv::Mat x=(cv::Mat_<double>(2,1)<<0.0,0.0),
step=(cv::Mat_<double>(2,1)<<0.5,+0.5),
etalon_x=(cv::Mat_<double>(2,1)<<1.0,1.0);
double etalon_res=0.0;
mytest(solver,ptr_F,x,step,etalon_x,etalon_res);
}
#endif
}