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
 *
 *  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 itkLBFGSOptimizer_h
#define itkLBFGSOptimizer_h

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

namespace itk
{
class ITKOptimizers_EXPORT LBFGSOptimizer:
  public SingleValuedNonLinearVnlOptimizer
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(LBFGSOptimizer);

  using Self = LBFGSOptimizer;
  using Superclass = SingleValuedNonLinearVnlOptimizer;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(LBFGSOptimizer, SingleValuedNonLinearVnlOptimizer);

  using InternalParametersType = vnl_vector< double >;

  using InternalOptimizerType = vnl_lbfgs;

  vnl_lbfgs * GetOptimizer();

  void StartOptimization() override;

  void SetCostFunction(SingleValuedCostFunction *costFunction) 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;

  const std::string GetStopConditionDescription() const override;

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

  using CostFunctionAdaptorType = Superclass::CostFunctionAdaptorType;

private:
  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