/usr/include/ITK-4.5/itkLBFGSOptimizer.h is in libinsighttoolkit4-dev 4.5.0-3.
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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"
namespace itk
{
/** \class LBFGSOptimizer
* \brief Wrap of the vnl_lbfgs algorithm
*
* \ingroup Numerics Optimizers
* \ingroup ITKOptimizers
*/
class LBFGSOptimizer:
public SingleValuedNonLinearVnlOptimizer
{
public:
/** Standard "Self" typedef. */
typedef LBFGSOptimizer Self;
typedef SingleValuedNonLinearVnlOptimizer Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(LBFGSOptimizer, SingleValuedNonLinearVnlOptimizer);
/** InternalParameters typedef. */
typedef vnl_vector< double > InternalParametersType;
/** Internal optimizer type. */
typedef vnl_lbfgs InternalOptimizerType;
/** Method for getting access to the internal optimizer. */
vnl_lbfgs * GetOptimizer(void);
/** Start optimization with an initial value. */
void StartOptimization(void);
/** Plug in a Cost Function into the optimizer */
virtual void SetCostFunction(SingleValuedCostFunction *costFunction);
/** Set/Get the optimizer trace flag. If set to true, the optimizer
* prints out information every iteration.
*/
virtual void SetTrace(bool flag);
itkGetMacro(Trace, bool);
itkBooleanMacro(Trace);
/** Set/Get the maximum number of function evaluations allowed. */
virtual void SetMaximumNumberOfFunctionEvaluations(unsigned int n);
itkGetMacro(MaximumNumberOfFunctionEvaluations, unsigned int);
/** Set/Get the gradient convergence tolerance. This is a positive
* real number that determines the accuracy with which the solution is to
* be found. The optimization terminates when:
* ||G|| < gtol max(1,||X||) where ||.|| denotes the Euclidean norm.
*/
virtual void SetGradientConvergenceTolerance(double gtol);
itkGetMacro(GradientConvergenceTolerance, double);
/** Set/Get the line search accuracy. This is a positive real number
* with a default value of 0.9, which controls the accuracy of the line
* search. If the function and gradient evalutions are inexpensive with
* respect to the cost of the iterations it may be advantageous to set
* the value to a small value (say 0.1).
*/
virtual void SetLineSearchAccuracy(double tol);
itkGetMacro(LineSearchAccuracy, double);
/** Set/Get the default step size. This is a positive real number
* with a default value of 1.0 which determines the stpe size in the line
* search.
*/
virtual void SetDefaultStepLength(double stp);
itkGetMacro(DefaultStepLength, double);
/** Return Current Value */
MeasureType GetValue() const;
/** Get the reason for termination */
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 std::ostringstream m_StopConditionDescription;
bool m_Trace;
unsigned int m_MaximumNumberOfFunctionEvaluations;
double m_GradientConvergenceTolerance;
double m_LineSearchAccuracy;
double m_DefaultStepLength;
};
} // end namespace itk
#endif
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