itkLBFGSOptimizer.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkLBFGSOptimizer.h,v $
  Language:  C++
  Date:      $Date: 2009-09-16 15:19:20 $
  Version:   $Revision: 1.22 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkLBFGSOptimizer_h
#define __itkLBFGSOptimizer_h

#include "itkSingleValuedNonLinearVnlOptimizer.h"
#include "vnl/algo/vnl_lbfgs.h"

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

  itkNewMacro(Self);

  itkTypeMacro( LBFGSOptimizer, SingleValuedNonLinearVnlOptimizer );

  typedef   vnl_vector<double>     InternalParametersType;

  typedef   vnl_lbfgs             InternalOptimizerType;

  vnl_lbfgs * GetOptimizer(void);

  void StartOptimization( void );

  virtual void SetCostFunction( SingleValuedCostFunction * costFunction );

  virtual void SetTrace( bool flag );
  itkGetMacro( Trace, bool );
  itkBooleanMacro( Trace );

  virtual void SetMaximumNumberOfFunctionEvaluations( unsigned int n );
  itkGetMacro( MaximumNumberOfFunctionEvaluations, unsigned int );

  virtual void SetGradientConvergenceTolerance( double gtol );
  itkGetMacro( GradientConvergenceTolerance, double );

  virtual void SetLineSearchAccuracy( double tol );
  itkGetMacro( LineSearchAccuracy, double );

  virtual void SetDefaultStepLength( double stp );
  itkGetMacro( DefaultStepLength, double );

  MeasureType GetValue() const;

  const std::string GetStopConditionDescription() const;

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

  typedef Superclass::CostFunctionAdaptorType   CostFunctionAdaptorType;

private:
  LBFGSOptimizer(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  
  bool                          m_OptimizerInitialized;
  InternalOptimizerType       * m_VnlOptimizer;
  mutable OStringStream         m_StopConditionDescription;

  bool                          m_Trace;
  unsigned int                  m_MaximumNumberOfFunctionEvaluations;
  double                        m_GradientConvergenceTolerance;
  double                        m_LineSearchAccuracy;
  double                        m_DefaultStepLength;

};

} // end namespace itk

#endif