itkMultiStartOptimizerv4.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 __itkMultiStartOptimizerv4_h
#define __itkMultiStartOptimizerv4_h
#include "itkObjectToObjectOptimizerBase.h"
#include "itkGradientDescentOptimizerv4.h"

namespace itk
{
class ITK_EXPORT MultiStartOptimizerv4
  : public ObjectToObjectOptimizerBase
{
public:
  typedef MultiStartOptimizerv4          Self;
  typedef ObjectToObjectOptimizerBase    Superclass;
  typedef SmartPointer< Self >           Pointer;
  typedef SmartPointer< const Self >     ConstPointer;

  itkTypeMacro(MultiStartOptimizerv4, ObjectToObjectOptimizerBase);

  itkNewMacro(Self);

  typedef Superclass::ParametersType                 ParametersType;
  typedef std::vector< ParametersType >              ParametersListType;
  typedef ParametersListType::size_type              ParameterListSizeType;
  typedef ObjectToObjectOptimizerBase                OptimizerType;
  typedef OptimizerType::Pointer                     OptimizerPointer;
  typedef itk::GradientDescentOptimizerv4            LocalOptimizerType;
  typedef itk::GradientDescentOptimizerv4::Pointer   LocalOptimizerPointer;

  typedef enum {
    MAXIMUM_NUMBER_OF_ITERATIONS,
    COSTFUNCTION_ERROR,
    UPDATE_PARAMETERS_ERROR,
    STEP_TOO_SMALL,
    CONVERGENCE_CHECKER_PASSED,
    OTHER_ERROR
    } StopConditionType;

  typedef std::string                            StopConditionReturnStringType;

  typedef std::ostringstream                     StopConditionDescriptionType;

  typedef Superclass::MetricType                    MetricType;
  typedef MetricType::Pointer                       MetricTypePointer;

  typedef MetricType::DerivativeType                DerivativeType;

  typedef Superclass::MeasureType                   MeasureType;
  typedef std::vector< MeasureType >                MetricValuesListType;

  typedef Superclass::InternalComputationValueType InternalComputationValueType;

  itkGetConstReferenceMacro(StopCondition, StopConditionType);

  itkSetMacro(NumberOfIterations, SizeValueType);

  itkGetConstReferenceMacro(NumberOfIterations, SizeValueType);

  itkGetConstMacro(CurrentIteration, SizeValueType);

  void InstantiateLocalOptimizer(void);

  virtual void StartOptimization( bool doOnlyInitialization = false );

  virtual void StopOptimization(void);

  virtual void ResumeOptimization();

  virtual const StopConditionReturnStringType GetStopConditionDescription() const;

  ParametersListType & GetParametersList();

  void SetParametersList(ParametersListType & p);

  const MetricValuesListType & GetMetricValuesList() const;

  ParametersType GetBestParameters( );

  itkSetObjectMacro( LocalOptimizer, OptimizerType );
  itkGetModifiableObjectMacro(LocalOptimizer, OptimizerType );

  inline ParameterListSizeType GetBestParametersIndex( ) { return this->m_BestParametersIndex; }

protected:

  MultiStartOptimizerv4();
  virtual ~MultiStartOptimizerv4();

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

  /* Common variables for optimization control and reporting */
  bool                          m_Stop;
  StopConditionType             m_StopCondition;
  StopConditionDescriptionType  m_StopConditionDescription;
  SizeValueType                 m_NumberOfIterations;
  SizeValueType                 m_CurrentIteration;
  ParametersListType            m_ParametersList;
  MetricValuesListType          m_MetricValuesList;
  MeasureType                   m_MinimumMetricValue;
  MeasureType                   m_MaximumMetricValue;
  ParameterListSizeType         m_BestParametersIndex;
  OptimizerPointer              m_LocalOptimizer;

private:
  MultiStartOptimizerv4( const Self & ); //purposely not implemented
  void operator=( const Self& ); //purposely not implemented

};

} // end namespace itk

#endif