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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef elxFiniteDifferenceGradientDescent_hxx
#define elxFiniteDifferenceGradientDescent_hxx
#include "elxFiniteDifferenceGradientDescent.h"
#include <itkDeref.h>
#include <iomanip>
#include <string>
#include "math.h"
namespace elastix
{
/**
* ********************* Constructor ****************************
*/
template <class TElastix>
FiniteDifferenceGradientDescent<TElastix>::FiniteDifferenceGradientDescent()
{
this->m_ShowMetricValues = false;
} // end Constructor
/**
* ***************** BeforeRegistration ***********************
*/
template <class TElastix>
void
FiniteDifferenceGradientDescent<TElastix>::BeforeRegistration()
{
const Configuration & configuration = itk::Deref(Superclass2::GetConfiguration());
std::string showMetricValues("false");
configuration.ReadParameter(showMetricValues, "ShowMetricValues", 0);
if (showMetricValues == "false")
{
this->m_ShowMetricValues = false;
this->SetComputeCurrentValue(this->m_ShowMetricValues);
}
else
{
this->m_ShowMetricValues = true;
this->SetComputeCurrentValue(this->m_ShowMetricValues);
}
/** Add some target cells to IterationInfo.*/
this->AddTargetCellToIterationInfo("2:Metric");
this->AddTargetCellToIterationInfo("3:Gain a_k");
this->AddTargetCellToIterationInfo("4:||Gradient||");
/** Format them as floats */
this->GetIterationInfoAt("2:Metric") << std::showpoint << std::fixed;
this->GetIterationInfoAt("3:Gain a_k") << std::showpoint << std::fixed;
this->GetIterationInfoAt("4:||Gradient||") << std::showpoint << std::fixed;
} // end BeforeRegistration
/**
* ***************** BeforeEachResolution ***********************
*/
template <class TElastix>
void
FiniteDifferenceGradientDescent<TElastix>::BeforeEachResolution()
{
/** Get the current resolution level.*/
unsigned int level = static_cast<unsigned int>(this->m_Registration->GetAsITKBaseType()->GetCurrentLevel());
const Configuration & configuration = itk::Deref(Superclass2::GetConfiguration());
/** Set the maximumNumberOfIterations.*/
unsigned int maximumNumberOfIterations = 500;
configuration.ReadParameter(
maximumNumberOfIterations, "MaximumNumberOfIterations", this->GetComponentLabel(), level, 0);
this->SetNumberOfIterations(maximumNumberOfIterations);
/** \todo GuessParameters function */
double a = 400.0;
double c = 1.0;
double A = 50.0;
double alpha = 0.602;
double gamma = 0.101;
configuration.ReadParameter(a, "SP_a", this->GetComponentLabel(), level, 0);
configuration.ReadParameter(c, "SP_c", this->GetComponentLabel(), level, 0);
configuration.ReadParameter(A, "SP_A", this->GetComponentLabel(), level, 0);
configuration.ReadParameter(alpha, "SP_alpha", this->GetComponentLabel(), level, 0);
configuration.ReadParameter(gamma, "SP_gamma", this->GetComponentLabel(), level, 0);
this->SetParam_a(a);
this->SetParam_c(c);
this->SetParam_A(A);
this->SetParam_alpha(alpha);
this->SetParam_gamma(gamma);
} // end BeforeEachResolution
/**
* ***************** AfterEachIteration *************************
*/
template <class TElastix>
void
FiniteDifferenceGradientDescent<TElastix>::AfterEachIteration()
{
/** Print some information */
if (this->m_ShowMetricValues)
{
this->GetIterationInfoAt("2:Metric") << this->GetValue();
}
else
{
this->GetIterationInfoAt("2:Metric") << "---";
}
this->GetIterationInfoAt("3:Gain a_k") << this->GetLearningRate();
this->GetIterationInfoAt("4:||Gradient||") << this->GetGradientMagnitude();
/** Select new spatial samples for the computation of the metric
* \todo You may also choose to select new samples after evaluation
* of the metric value */
if (this->GetNewSamplesEveryIteration())
{
this->SelectNewSamples();
}
} // end AfterEachIteration
/**
* ***************** AfterEachResolution *************************
*/
template <class TElastix>
void
FiniteDifferenceGradientDescent<TElastix>::AfterEachResolution()
{
/**
* enum StopConditionType { MaximumNumberOfIterations, MetricError }
*/
std::string stopcondition;
switch (this->GetStopCondition())
{
case MaximumNumberOfIterations:
stopcondition = "Maximum number of iterations has been reached";
break;
case MetricError:
stopcondition = "Error in metric";
break;
default:
stopcondition = "Unknown";
break;
}
/** Print the stopping condition */
log::info(std::ostringstream{} << "Stopping condition: " << stopcondition << ".");
} // end AfterEachResolution
/**
* ******************* AfterRegistration ************************
*/
template <class TElastix>
void
FiniteDifferenceGradientDescent<TElastix>::AfterRegistration()
{
/** Print the best metric value */
double bestValue;
if (this->m_ShowMetricValues)
{
bestValue = this->GetValue();
log::info(std::ostringstream{} << '\n' << "Final metric value = " << bestValue);
}
else
{
log::info(std::ostringstream{}
<< '\n'
<< "Run Elastix again with the option \"ShowMetricValues\" set to \"true\", to see information about the "
"metric values. ");
}
} // end AfterRegistration
/**
* ******************* StartOptimization ***********************
*/
template <class TElastix>
void
FiniteDifferenceGradientDescent<TElastix>::StartOptimization()
{
/** Check if the entered scales are correct and != [ 1 1 1 ...] */
this->SetUseScales(false);
const ScalesType & scales = this->GetScales();
if (scales.GetSize() == this->GetInitialPosition().GetSize())
{
ScalesType unit_scales(scales.GetSize(), 1.0);
if (scales != unit_scales)
{
/** only then: */
this->SetUseScales(true);
}
}
this->Superclass1::StartOptimization();
} // end StartOptimization
} // end namespace elastix
#endif // end #ifndef elxFiniteDifferenceGradientDescent_hxx
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