itkLBFGSOptimizer.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
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 *  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 __itkLBFGSOptimizer_h
#define __itkLBFGSOptimizer_h

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

namespace itk
{
class 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);

  virtual void StartOptimization(void) ITK_OVERRIDE;

  virtual void SetCostFunction(SingleValuedCostFunction *costFunction) ITK_OVERRIDE;

  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;

  virtual const std::string GetStopConditionDescription() const ITK_OVERRIDE;

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

  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 std::ostringstream m_StopConditionDescription;

  bool         m_Trace;
  unsigned int m_MaximumNumberOfFunctionEvaluations;
  double       m_GradientConvergenceTolerance;
  double       m_LineSearchAccuracy;
  double       m_DefaultStepLength;
};
} // end namespace itk

#endif