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itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample > Class Template Reference
Group Numerics » Module ITKStatistics

#include <itkExpectationMaximizationMixtureModelEstimator.h>

Detailed Description

template<typename TSample>
class itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >

This class generates the parameter estimates for a mixture model using expectation maximization strategy.

The first template argument is the type of the target sample data. This estimator expects one or more mixture model component objects of the classes derived from the MixtureModelComponentBase. The actual component (or module) parameters are updated by each component. Users can think this class as a strategy or a integration point for the EM procedure. The initial proportion (SetInitialProportions), the input sample (SetSample), the mixture model components (AddComponent), and the maximum iteration (SetMaximumIteration) are required. The EM procedure terminates when the current iteration reaches the maximum iteration or the model parameters converge.

Recent API changes: The static const macro to get the length of a measurement vector, MeasurementVectorSize has been removed to allow the length of a measurement vector to be specified at run time. It is now obtained at run time from the sample set as input. Please use the function GetMeasurementVectorSize() to get the length.

See also
MixtureModelComponentBase, GaussianMixtureModelComponent
ITK Sphinx Examples:
Examples
Examples/Statistics/ExpectationMaximizationMixtureModelEstimator.cxx, SphinxExamples/src/Numerics/Statistics/2DGaussianMixtureModelExpectMax/Code.cxx, SphinxExamples/src/Numerics/Statistics/DistributeSamplingUsingGMM/Code.cxx, and SphinxExamples/src/Numerics/Statistics/DistributionOfPixelsUsingGMM/Code.cxx.

Definition at line 86 of file itkExpectationMaximizationMixtureModelEstimator.h.

+ Inheritance diagram for itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >:
+ Collaboration diagram for itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >:

Public Types

using ComponentMembershipFunctionType = MembershipFunctionBase< MeasurementVectorType >
 
using ComponentType = MixtureModelComponentBase< TSample >
 
using ComponentVectorType = std::vector< ComponentType * >
 
using ConstPointer = SmartPointer< const Self >
 
using GaussianMembershipFunctionPointer = typename GaussianMembershipFunctionType::Pointer
 
using GaussianMembershipFunctionType = GaussianMembershipFunction< MeasurementVectorType >
 
using MeasurementType = typename TSample::MeasurementType
 
using MeasurementVectorType = typename TSample::MeasurementVectorType
 
using MembershipFunctionPointer = typename MembershipFunctionType::ConstPointer
 
using MembershipFunctionsWeightsArrayObjectType = SimpleDataObjectDecorator< ProportionVectorType >
 
using MembershipFunctionsWeightsArrayPointer = typename MembershipFunctionsWeightsArrayObjectType::Pointer
 
using MembershipFunctionType = MembershipFunctionBase< MeasurementVectorType >
 
using MembershipFunctionVectorObjectPointer = typename MembershipFunctionVectorObjectType::Pointer
 
using MembershipFunctionVectorObjectType = SimpleDataObjectDecorator< MembershipFunctionVectorType >
 
using MembershipFunctionVectorType = std::vector< MembershipFunctionPointer >
 
using Pointer = SmartPointer< Self >
 
using ProportionVectorType = Array< double >
 
using SampleType = TSample
 
using Self = ExpectationMaximizationMixtureModelEstimator
 
using Superclass = Object
 
using TERMINATION_CODE_ENUM = ExpectationMaximizationMixtureModelEstimatorEnums::TERMINATION_CODE
 
- Public Types inherited from itk::Object
using ConstPointer = SmartPointer< const Self >
 
using Pointer = SmartPointer< Self >
 
using Self = Object
 
using Superclass = LightObject
 
- Public Types inherited from itk::LightObject
using ConstPointer = SmartPointer< const Self >
 
using Pointer = SmartPointer< Self >
 
using Self = LightObject
 

Public Member Functions

int AddComponent (ComponentType *component)
 
ComponentMembershipFunctionType * GetComponentMembershipFunction (int componentIndex) const
 
int GetCurrentIteration ()
 
const ProportionVectorType & GetInitialProportions () const
 
int GetMaximumIteration () const
 
const MembershipFunctionsWeightsArrayObjectType * GetMembershipFunctionsWeightsArray () const
 
unsigned int GetNumberOfComponents () const
 
const MembershipFunctionVectorObjectType * GetOutput () const
 
const ProportionVectorType & GetProportions () const
 
const TSample * GetSample () const
 
TERMINATION_CODE_ENUM GetTerminationCode () const
 
void SetInitialProportions (ProportionVectorType &proportions)
 
void SetMaximumIteration (int numberOfIterations)
 
void SetSample (const TSample *sample)
 
void Update ()
 
- Public Member Functions inherited from itk::Object
unsigned long AddObserver (const EventObject &event, Command *cmd) const
 
unsigned long AddObserver (const EventObject &event, std::function< void(const EventObject &)> function) const
 
LightObject::Pointer CreateAnother () const override
 
virtual void DebugOff () const
 
virtual void DebugOn () const
 
Command * GetCommand (unsigned long tag)
 
bool GetDebug () const
 
MetaDataDictionary & GetMetaDataDictionary ()
 
const MetaDataDictionary & GetMetaDataDictionary () const
 
virtual ModifiedTimeType GetMTime () const
 
virtual const TimeStamp & GetTimeStamp () const
 
bool HasObserver (const EventObject &event) const
 
void InvokeEvent (const EventObject &)
 
void InvokeEvent (const EventObject &) const
 
virtual void Modified () const
 
void Register () const override
 
void RemoveAllObservers ()
 
void RemoveObserver (unsigned long tag) const
 
void SetDebug (bool debugFlag) const
 
void SetReferenceCount (int) override
 
void UnRegister () const noexcept override
 
void SetMetaDataDictionary (const MetaDataDictionary &rhs)
 
void SetMetaDataDictionary (MetaDataDictionary &&rrhs)
 
virtual void SetObjectName (std::string _arg)
 
virtual const std::string & GetObjectName () const
 
- Public Member Functions inherited from itk::LightObject
Pointer Clone () const
 
virtual void Delete ()
 
virtual int GetReferenceCount () const
 
void Print (std::ostream &os, Indent indent=0) const
 

Protected Member Functions

bool CalculateDensities ()
 
double CalculateExpectation () const
 
 ExpectationMaximizationMixtureModelEstimator ()
 
void GenerateData ()
 
void PrintSelf (std::ostream &os, Indent indent) const override
 
bool UpdateComponentParameters ()
 
bool UpdateProportions ()
 
 ~ExpectationMaximizationMixtureModelEstimator () override=default
 
- Protected Member Functions inherited from itk::Object
 Object ()
 
bool PrintObservers (std::ostream &os, Indent indent) const
 
virtual void SetTimeStamp (const TimeStamp &timeStamp)
 
 ~Object () override
 
- Protected Member Functions inherited from itk::LightObject
virtual LightObject::Pointer InternalClone () const
 
 LightObject ()
 
virtual void PrintHeader (std::ostream &os, Indent indent) const
 
virtual void PrintTrailer (std::ostream &os, Indent indent) const
 
virtual ~LightObject ()
 

Private Attributes

ComponentVectorType m_ComponentVector {}
 
int m_CurrentIteration { 0 }
 
ProportionVectorType m_InitialProportions {}
 
int m_MaxIteration { 100 }
 
MembershipFunctionVectorObjectPointer m_MembershipFunctionsObject {}
 
MembershipFunctionsWeightsArrayPointer m_MembershipFunctionsWeightArrayObject {}
 
ProportionVectorType m_Proportions {}
 
const TSample * m_Sample {}
 
TERMINATION_CODE_ENUM m_TerminationCode { TERMINATION_CODE_ENUM::NOT_CONVERGED }
 
const char * GetNameOfClass () const override
 
static Pointer New ()
 

Additional Inherited Members

- Static Public Member Functions inherited from itk::Object
static bool GetGlobalWarningDisplay ()
 
static void GlobalWarningDisplayOff ()
 
static void GlobalWarningDisplayOn ()
 
static Pointer New ()
 
static void SetGlobalWarningDisplay (bool val)
 
- Static Public Member Functions inherited from itk::LightObject
static void BreakOnError ()
 
static Pointer New ()
 
- Protected Attributes inherited from itk::LightObject
std::atomic< int > m_ReferenceCount {}
 

Member Typedef Documentation

◆ ComponentMembershipFunctionType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ComponentMembershipFunctionType = MembershipFunctionBase<MeasurementVectorType>

Type of the membership function base class

Definition at line 124 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ ComponentType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ComponentType = MixtureModelComponentBase<TSample>

Type of the mixture model component base class

Definition at line 118 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ ComponentVectorType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ComponentVectorType = std::vector<ComponentType *>

Type of the component pointer storage

Definition at line 121 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ ConstPointer

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ConstPointer = SmartPointer<const Self>

Definition at line 93 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ GaussianMembershipFunctionPointer

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GaussianMembershipFunctionPointer = typename GaussianMembershipFunctionType::Pointer

Definition at line 109 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ GaussianMembershipFunctionType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GaussianMembershipFunctionType = GaussianMembershipFunction<MeasurementVectorType>

Typedef required to generate dataobject decorated output that can be plugged into SampleClassifierFilter

Definition at line 107 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MeasurementType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MeasurementType = typename TSample::MeasurementType

Definition at line 102 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MeasurementVectorType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MeasurementVectorType = typename TSample::MeasurementVectorType

Definition at line 103 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionPointer

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionPointer = typename MembershipFunctionType::ConstPointer

Definition at line 112 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionsWeightsArrayObjectType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionsWeightsArrayObjectType = SimpleDataObjectDecorator<ProportionVectorType>

type alias for decorated array of proportion

Definition at line 150 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionsWeightsArrayPointer

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionsWeightsArrayPointer = typename MembershipFunctionsWeightsArrayObjectType::Pointer

Definition at line 151 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionType = MembershipFunctionBase<MeasurementVectorType>

Definition at line 111 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionVectorObjectPointer

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionVectorObjectPointer = typename MembershipFunctionVectorObjectType::Pointer

Definition at line 115 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionVectorObjectType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionVectorObjectType = SimpleDataObjectDecorator<MembershipFunctionVectorType>

Definition at line 114 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ MembershipFunctionVectorType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionVectorType = std::vector<MembershipFunctionPointer>

Definition at line 113 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ Pointer

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Pointer = SmartPointer<Self>

Definition at line 92 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ ProportionVectorType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ProportionVectorType = Array<double>

Type of the array of the proportion values

Definition at line 127 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ SampleType

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SampleType = TSample

TSample template argument related type alias

Definition at line 101 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ Self

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Self = ExpectationMaximizationMixtureModelEstimator

Standard class type alias

Definition at line 90 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ Superclass

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Superclass = Object

Definition at line 91 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ TERMINATION_CODE_ENUM

template<typename TSample >
using itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::TERMINATION_CODE_ENUM = ExpectationMaximizationMixtureModelEstimatorEnums::TERMINATION_CODE

Definition at line 186 of file itkExpectationMaximizationMixtureModelEstimator.h.

Constructor & Destructor Documentation

◆ ExpectationMaximizationMixtureModelEstimator()

template<typename TSample >
itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ExpectationMaximizationMixtureModelEstimator ( )
protected

◆ ~ExpectationMaximizationMixtureModelEstimator()

template<typename TSample >
itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::~ExpectationMaximizationMixtureModelEstimator ( )
overrideprotecteddefault

Member Function Documentation

◆ AddComponent()

template<typename TSample >
int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::AddComponent ( ComponentType *  component)

Adds a new component (or class).

◆ CalculateDensities()

template<typename TSample >
bool itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::CalculateDensities ( )
protected

◆ CalculateExpectation()

template<typename TSample >
double itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::CalculateExpectation ( ) const
protected

◆ GenerateData()

template<typename TSample >
void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GenerateData ( )
protected

Starts the estimation process

◆ GetComponentMembershipFunction()

template<typename TSample >
ComponentMembershipFunctionType* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetComponentMembershipFunction ( int  componentIndex) const

Gets the membership function specified by componentIndex argument.

◆ GetCurrentIteration()

template<typename TSample >
int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetCurrentIteration ( )
inline

Gets the current iteration.

Definition at line 169 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ GetInitialProportions()

template<typename TSample >
const ProportionVectorType& itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetInitialProportions ( ) const

◆ GetMaximumIteration()

template<typename TSample >
int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetMaximumIteration ( ) const

◆ GetMembershipFunctionsWeightsArray()

template<typename TSample >
const MembershipFunctionsWeightsArrayObjectType* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetMembershipFunctionsWeightsArray ( ) const

Get method for data decorated Membership functions weights array

◆ GetNameOfClass()

template<typename TSample >
const char* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetNameOfClass ( ) const
overridevirtual
See also
LightObject::GetNameOfClass()

Reimplemented from itk::Object.

◆ GetNumberOfComponents()

template<typename TSample >
unsigned int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetNumberOfComponents ( ) const

Gets the total number of classes currently plugged in.

◆ GetOutput()

template<typename TSample >
const MembershipFunctionVectorObjectType* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetOutput ( ) const

Output Membership function vector containing the membership functions with the final optimized parameters

◆ GetProportions()

template<typename TSample >
const ProportionVectorType& itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetProportions ( ) const

Gets the result proportion values

◆ GetSample()

template<typename TSample >
const TSample* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetSample ( ) const

Returns the target data

◆ GetTerminationCode()

template<typename TSample >
TERMINATION_CODE_ENUM itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetTerminationCode ( ) const

Gets the termination status

◆ New()

template<typename TSample >
static Pointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::New ( )
static
See also
LightObject::GetNameOfClass()

◆ PrintSelf()

template<typename TSample >
void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::PrintSelf ( std::ostream &  os,
Indent  indent 
) const
overrideprotectedvirtual

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from itk::Object.

◆ SetInitialProportions()

template<typename TSample >
void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SetInitialProportions ( ProportionVectorType &  proportions)

Set/Gets the initial proportion values. The size of proportion vector should be same as the number of component (or classes)

◆ SetMaximumIteration()

template<typename TSample >
void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SetMaximumIteration ( int  numberOfIterations)

Set/Gets the maximum number of iterations. When the optimization process reaches the maximum number of iterations, even if the class parameters aren't converged, the optimization process stops.

◆ SetSample()

template<typename TSample >
void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SetSample ( const TSample *  sample)

Sets the target data that will be classified by this

◆ Update()

template<typename TSample >
void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Update ( )

Runs the optimization process.

◆ UpdateComponentParameters()

template<typename TSample >
bool itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::UpdateComponentParameters ( )
protected

◆ UpdateProportions()

template<typename TSample >
bool itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::UpdateProportions ( )
protected

Member Data Documentation

◆ m_ComponentVector

template<typename TSample >
ComponentVectorType itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_ComponentVector {}
private

Definition at line 237 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_CurrentIteration

template<typename TSample >
int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_CurrentIteration { 0 }
private

Definition at line 234 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_InitialProportions

template<typename TSample >
ProportionVectorType itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_InitialProportions {}
private

Definition at line 238 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_MaxIteration

template<typename TSample >
int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_MaxIteration { 100 }
private

Definition at line 233 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_MembershipFunctionsObject

template<typename TSample >
MembershipFunctionVectorObjectPointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_MembershipFunctionsObject {}
private

Definition at line 241 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_MembershipFunctionsWeightArrayObject

template<typename TSample >
MembershipFunctionsWeightsArrayPointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_MembershipFunctionsWeightArrayObject {}
private

Definition at line 242 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_Proportions

template<typename TSample >
ProportionVectorType itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_Proportions {}
private

Definition at line 239 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_Sample

template<typename TSample >
const TSample* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_Sample {}
private

Target data sample pointer

Definition at line 231 of file itkExpectationMaximizationMixtureModelEstimator.h.

◆ m_TerminationCode

template<typename TSample >
TERMINATION_CODE_ENUM itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::m_TerminationCode { TERMINATION_CODE_ENUM::NOT_CONVERGED }
private

Definition at line 236 of file itkExpectationMaximizationMixtureModelEstimator.h.

The documentation for this class was generated from the following file:
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