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/************************************************************************
*
* Copyright (C) 2018-2023 IRCAD France
* Copyright (C) 2018-2021 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
// cspell:ignore NOLINTNEXTLINE
#include "filter/image/powell_optimizer.hpp"
#include <core/spy_log.hpp>
namespace sight::filter::image
{
// NOLINTNEXTLINE(cppcoreguidelines-virtual-class-destructor): used via pointers
class powell_metric : public powell_optimizer::powell_optimizer_t::MetricType
{
public:
using self_t = powell_metric;
using superclass = powell_optimizer::powell_optimizer_t::MetricType;
using Pointer = itk::SmartPointer<self_t>;
itkNewMacro(self_t);
//-----------------------------------------------------------------------------
void Initialize() override
{
}
//-----------------------------------------------------------------------------
void set_function(powell_optimizer::optimized_function_t _f)
{
m_function = _f;
}
//-----------------------------------------------------------------------------
void SetParameters(ParametersType& _params) override
{
m_parameters = _params;
}
//-----------------------------------------------------------------------------
NumberOfParametersType GetNumberOfParameters() const override
{
return static_cast<NumberOfParametersType>(m_parameters.size());
}
//-----------------------------------------------------------------------------
MeasureType GetValue() const override
{
m_Value = m_function(m_parameters);
return m_Value;
}
//-----------------------------------------------------------------------------
void GetDerivative(DerivativeType& /*unused*/) const override
{
// Unused in Powell's method.
}
//-----------------------------------------------------------------------------
void GetValueAndDerivative(MeasureType& /*value*/, DerivativeType& /*derivative*/) const override
{
}
//-----------------------------------------------------------------------------
NumberOfParametersType GetNumberOfLocalParameters() const override
{
return 0;
}
//-----------------------------------------------------------------------------
const ParametersType& GetParameters() const override
{
return m_parameters;
}
//-----------------------------------------------------------------------------
bool HasLocalSupport() const override
{
return false;
}
//-----------------------------------------------------------------------------
void UpdateTransformParameters(const DerivativeType& /*derivative*/, ParametersValueType /*factor*/) override
{
}
//-----------------------------------------------------------------------------
private:
powell_metric()
= default;
~powell_metric() override
= default;
ParametersType m_parameters;
powell_optimizer::optimized_function_t m_function;
};
//-----------------------------------------------------------------------------
powell_optimizer::powell_optimizer(
const powell_optimizer::optimized_function_t& _f,
double _step_tolerance,
double _value_tolerance,
double _step_length,
std::uint32_t _maximum_iterations
) :
m_function(_f)
{
m_powell_optimizer = powell_optimizer_t::New();
m_powell_optimizer->SetStepTolerance(_step_tolerance);
m_powell_optimizer->SetValueTolerance(_value_tolerance);
m_powell_optimizer->SetStepLength(_step_length);
m_powell_optimizer->SetMaximumIteration(_maximum_iterations);
}
//-----------------------------------------------------------------------------
powell_optimizer::function_parameters_t powell_optimizer::optimize(
const powell_optimizer::function_parameters_t& _init_parameters
)
{
auto metric = powell_metric::New();
metric->set_function(m_function);
function_parameters_t init_params(_init_parameters);
metric->SetParameters(init_params);
m_powell_optimizer->SetMetric(metric);
try
{
m_powell_optimizer->StartOptimization();
}
catch(itk::ExceptionObject& e)
{
SIGHT_ERROR("Powell optimizer exception : " << e);
}
return metric->GetParameters();
}
//-----------------------------------------------------------------------------
} // namespace sight::filter::image.
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