File: itkConvergenceMonitoringFunction.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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 itkConvergenceMonitoringFunction_h
#define itkConvergenceMonitoringFunction_h

#include "itkObject.h"
#include "itkObjectFactory.h"

#include "itkNumericTraits.h"

#include <deque>

namespace itk
{
namespace Function
{
/**
 * \class ConvergenceMonitoringFunction
 * \brief Abstract base class which monitors convergence during the course of optimization.
 *
 *
 * \author Nick Tustison
 * \author Brian Avants
 *
 * \ingroup ITKOptimizersv4
 */
template<typename TScalar, typename TEnergyValue>
class ConvergenceMonitoringFunction
: public Object
{
public:

  typedef ConvergenceMonitoringFunction                      Self;
  typedef Object                                             Superclass;
  typedef SmartPointer<Self>                                 Pointer;
  typedef SmartPointer<const Self>                           ConstPointer;

  /** Run-time type information (and related methods). */
  itkTypeMacro( ConvergenceMonitoringFunction, Object );

  typedef TScalar                                            ScalarType;
  typedef typename NumericTraits<ScalarType>::RealType       RealType;

  typedef TEnergyValue                                       EnergyValueType;
  typedef std::deque<EnergyValueType>                        EnergyValueContainerType;
  typedef typename EnergyValueContainerType::size_type       EnergyValueContainerSizeType;
  typedef typename EnergyValueContainerType::iterator        EnergyValueIterator;
  typedef typename EnergyValueContainerType::const_iterator  EnergyValueConstIterator;

  /* Add energy value to the end of the profile. */
  virtual void AddEnergyValue( const EnergyValueType value )
    {
    itkDebugMacro( "Adding energy value " << value );
    this->m_EnergyValues.push_back( value );
    this->Modified();
    }

  /* Get the current number of energy values. */
  EnergyValueContainerSizeType GetNumberOfEnergyValues() const
    {
    return this->m_EnergyValues.size();
    }

  /** Clear all the energy values. */
  virtual void ClearEnergyValues()
    {
    if( this->GetNumberOfEnergyValues() > 0 )
      {
      itkDebugMacro( "Clearing energy values." );
      this->m_EnergyValues.clear();
      this->Modified();
      }
    }

  /** Derived classes are responsible for defining the convergence value calculation */
  virtual RealType GetConvergenceValue() const = 0;

protected:
  ConvergenceMonitoringFunction()
    {
    this->m_EnergyValues.clear();
    }

  ~ConvergenceMonitoringFunction() ITK_OVERRIDE {}

  virtual void PrintSelf( std::ostream & os, Indent indent ) const ITK_OVERRIDE
    {
    Superclass::PrintSelf( os, indent );

    os << std::endl << "Energy values: " << std::flush;

    EnergyValueConstIterator it = this->m_EnergyValues.begin();
    while( it != this->m_EnergyValues.end() )
      {
      os << "(" << it - this->m_EnergyValues.begin() << "): " << *it << " ";
      ++it;
      }
    os << std::endl;
    }

  EnergyValueContainerType          m_EnergyValues;

private:
  ITK_DISALLOW_COPY_AND_ASSIGN(ConvergenceMonitoringFunction);

};
} // end namespace function
} // end namespace itk

#endif