elxAdaptiveStochasticGradientDescent.h

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 *  Copyright UMC Utrecht and contributors
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 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
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#ifndef elxAdaptiveStochasticGradientDescent_h
#define elxAdaptiveStochasticGradientDescent_h
 
#include "elxIncludes.h" // include first to avoid MSVS warning
#include "itkAdaptiveStochasticGradientDescentOptimizer.h"
 
#include "itkComputeJacobianTerms.h"            // For  ASGD step size
#include "itkComputeDisplacementDistribution.h" // For FASGD step size
#include "elxProgressCommand.h"
#include "itkAdvancedTransform.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"
 
 
namespace elastix
{
template <class TElastix>
class ITK_TEMPLATE_EXPORT AdaptiveStochasticGradientDescent
  : public itk::AdaptiveStochasticGradientDescentOptimizer
  , public OptimizerBase<TElastix>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(AdaptiveStochasticGradientDescent);
 
  using Self = AdaptiveStochasticGradientDescent;
  using Superclass1 = AdaptiveStochasticGradientDescentOptimizer;
  using Superclass2 = OptimizerBase<TElastix>;
  using Pointer = itk::SmartPointer<Self>;
  using ConstPointer = itk::SmartPointer<const Self>;
 
  itkNewMacro(Self);
 
  itkTypeMacro(AdaptiveStochasticGradientDescent, AdaptiveStochasticGradientDescentOptimizer);
 
  elxClassNameMacro("AdaptiveStochasticGradientDescent");
 
  using Superclass1::CostFunctionType;
  using Superclass1::CostFunctionPointer;
  using Superclass1::StopConditionType;
 
  using typename Superclass2::ElastixType;
  using typename Superclass2::RegistrationType;
  using ITKBaseType = typename Superclass2::ITKBaseType;
  using SizeValueType = itk::SizeValueType;
 
  using typename Superclass1::ParametersType;
 
  void
  BeforeRegistration() override;
 
  void
  BeforeEachResolution() override;
 
  void
  AfterEachResolution() override;
 
  void
  AfterEachIteration() override;
 
  void
  AfterRegistration() override;
 
  void
  StartOptimization() override;
 
  void
  ResumeOptimization() override;
 
  void
  MetricErrorResponse(itk::ExceptionObject & err) override;
 
  itkSetMacro(AutomaticParameterEstimation, bool);
  itkGetConstMacro(AutomaticParameterEstimation, bool);
 
  itkSetMacro(MaximumStepLength, double);
  itkGetConstMacro(MaximumStepLength, double);
 
  itkSetMacro(MaximumNumberOfSamplingAttempts, SizeValueType);
 
  itkGetConstReferenceMacro(MaximumNumberOfSamplingAttempts, SizeValueType);
 
protected:
  using FixedImageType = typename RegistrationType::FixedImageType;
  using MovingImageType = typename RegistrationType::MovingImageType;
 
  using FixedImageRegionType = typename FixedImageType::RegionType;
  using FixedImageIndexType = typename FixedImageType::IndexType;
  using FixedImagePointType = typename FixedImageType::PointType;
  using itkRegistrationType = typename RegistrationType::ITKBaseType;
  using TransformType = typename itkRegistrationType::TransformType;
  using JacobianType = typename TransformType::JacobianType;
  using ComputeJacobianTermsType = itk::ComputeJacobianTerms<FixedImageType, TransformType>;
  using JacobianValueType = typename JacobianType::ValueType;
  using typename Superclass2::SettingsType;
  using typename Superclass2::SettingsVectorType;
  using ComputeDisplacementDistributionType = itk::ComputeDisplacementDistribution<FixedImageType, TransformType>;
 
  using ImageSamplerBaseType = itk::ImageSamplerBase<FixedImageType>;
  using ImageSamplerBasePointer = typename ImageSamplerBaseType::Pointer;
  using ImageRandomSamplerBaseType = itk::ImageRandomSamplerBase<FixedImageType>;
  using ImageRandomSamplerBasePointer = typename ImageRandomSamplerBaseType::Pointer;
  using ImageRandomCoordinateSamplerType = itk::ImageRandomCoordinateSampler<FixedImageType>;
  using ImageRandomCoordinateSamplerPointer = typename ImageRandomCoordinateSamplerType::Pointer;
  using ImageGridSamplerType = itk::ImageGridSampler<FixedImageType>;
  using ImageGridSamplerPointer = typename ImageGridSamplerType::Pointer;
  using ImageSampleContainerType = typename ImageGridSamplerType::ImageSampleContainerType;
  using ImageSampleContainerPointer = typename ImageSampleContainerType::Pointer;
 
  using RandomGeneratorType = itk::Statistics::MersenneTwisterRandomVariateGenerator;
  using RandomGeneratorPointer = typename RandomGeneratorType::Pointer;
 
  using TransformJacobianType = JacobianType;
  itkStaticConstMacro(FixedImageDimension, unsigned int, FixedImageType::ImageDimension);
  itkStaticConstMacro(MovingImageDimension, unsigned int, MovingImageType::ImageDimension);
  using CoordinateRepresentationType = typename TransformType::ScalarType;
  using AdvancedTransformType =
    itk::AdvancedTransform<CoordinateRepresentationType, Self::FixedImageDimension, Self::MovingImageDimension>;
  using AdvancedTransformPointer = typename AdvancedTransformType::Pointer;
  using NonZeroJacobianIndicesType = typename AdvancedTransformType::NonZeroJacobianIndicesType;
 
  AdaptiveStochasticGradientDescent();
  ~AdaptiveStochasticGradientDescent() override = default;
 
  SettingsVectorType m_SettingsVector;
 
  SizeValueType m_NumberOfGradientMeasurements;
  SizeValueType m_NumberOfJacobianMeasurements;
  SizeValueType m_NumberOfSamplesForExactGradient;
 
  AdvancedTransformPointer m_AdvancedTransform;
 
  RandomGeneratorPointer m_RandomGenerator;
 
  double m_SigmoidScaleFactor;
 
  virtual void
  AutomaticParameterEstimation();
 
  virtual void
  AutomaticParameterEstimationOriginal();
 
  virtual void
  AutomaticParameterEstimationUsingDisplacementDistribution();
 
  virtual void
  SampleGradients(const ParametersType & mu0, double perturbationSigma, double & gg, double & ee);
 
  virtual void
  GetScaledDerivativeWithExceptionHandling(const ParametersType & parameters, DerivativeType & derivative);
 
  virtual void
  AddRandomPerturbation(ParametersType & parameters, double sigma);
 
private:
  elxOverrideGetSelfMacro;
 
  bool   m_AutomaticParameterEstimation;
  double m_MaximumStepLength;
  double m_MaximumStepLengthRatio;
 
  SizeValueType m_MaximumNumberOfSamplingAttempts;
  SizeValueType m_CurrentNumberOfSamplingAttempts;
  SizeValueType m_PreviousErrorAtIteration;
  bool          m_AutomaticParameterEstimationDone;
 
  SizeValueType m_MaxBandCovSize;
  SizeValueType m_NumberOfBandStructureSamples;
 
  bool m_UseNoiseCompensation;
  bool m_OriginalButSigmoidToDefault;
};
 
} // end namespace elastix
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "elxAdaptiveStochasticGradientDescent.hxx"
#endif
 
#endif // end #ifndef elxAdaptiveStochasticGradientDescent_h