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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Fit/Kernel/Kernel.cpp
//! @brief Implements class Kernel.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "Fit/Kernel/Kernel.h"
#include "Fit/Kernel/MinimizerFactory.h"
#include "Fit/Minimizer/IMinimizer.h"
#include "Fit/Tool/WallclockTimer.h"
using namespace mumufit;
namespace {
const std::string default_minimizer = "Minuit2";
const std::string default_algorithm = "Migrad";
} // namespace
Kernel::Kernel()
{
setMinimizer(default_minimizer, default_algorithm);
}
Kernel::~Kernel() = default;
void Kernel::setMinimizer(const std::string& minimizerName, const std::string& algorithmName,
const std::string& options)
{
m_minimizer.reset(MinimizerFactory::createMinimizer(minimizerName, algorithmName, options));
}
void Kernel::setMinimizer(IMinimizer* minimizer)
{
m_minimizer.reset(minimizer);
}
MinimizerResult Kernel::minimize(const fcn_scalar_t fcn, const Parameters& parameters) const
{
WallclockTimer timer;
timer.start();
if (m_minimizer->requiresResiduals())
throw std::runtime_error(
"Error in Kernel::minimize: the chosen minimizer requires residuals computation. "
"Please use FitObjective::evaluate_residuals with this minimizer.");
auto result = m_minimizer->minimize_scalar(fcn, parameters);
timer.stop();
result.setDuration(timer.runTime());
return result;
}
MinimizerResult Kernel::minimize(const fcn_residual_t fcn, const Parameters& parameters) const
{
WallclockTimer timer;
timer.start();
auto result = m_minimizer->minimize_residual(fcn, parameters);
timer.stop();
result.setDuration(timer.runTime());
return result;
}
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