dai::CondProbEstimation Class Reference

Estimates the parameters of a conditional probability table, using pseudocounts. More...

#include <dai/emalg.h>

Inheritance diagram for dai::CondProbEstimation:

Public Member Functions
	CondProbEstimation (size_t target_dimension, const Prob &pseudocounts)
	Constructor. More...
virtual ParameterEstimation *	clone () const
	Virtual copy constructor. More...
virtual	~CondProbEstimation ()
	Virtual destructor. More...
virtual Prob	parameters (const Prob &p)
	Returns an estimate of the conditional probability distribution. More...
virtual Prob	parametersToFactor (const Prob &p)
	Convert a set of estimated parameters to a factor. More...
virtual size_t	probSize () const
	Returns the required size for arguments to estimate(). More...
virtual const std::string &	name () const
virtual const PropertySet &	properties () const

Static Public Member Functions
static ParameterEstimation *	factory (const PropertySet &p)
	Virtual constructor, using a PropertySet. More...

Private Attributes
size_t	_target_dim
	Number of states of the variable of interest. More...
Prob	_initial_stats
	Initial pseudocounts. More...
PropertySet	_props
	PropertySet that allows reconstruction of this estimator. More...

Static Private Attributes
static std::string	_name = "CondProbEstimation"

Additional Inherited Members
Private Types inherited from dai::ParameterEstimation
typedef ParameterEstimation *(*	ParamEstFactory) (const PropertySet &)
	Type of pointer to factory function. More...
Private Member Functions inherited from dai::ParameterEstimation
virtual	~ParameterEstimation ()
	Virtual destructor for deleting pointers to derived classes. More...
virtual Prob	estimate (const Prob &p)
	Estimate the factor using the provided expectations. More...
Static Private Member Functions inherited from dai::ParameterEstimation
static ParameterEstimation *	construct (const std::string &method, const PropertySet &p)
	General factory method that constructs the desired ParameterEstimation subclass. More...
static void	registerMethod (const std::string &method, const ParamEstFactory &f)
	Register a subclass so that it can be used with construct(). More...

Detailed Description

Estimates the parameters of a conditional probability table, using pseudocounts.

Author

Charles Vaske

Constructor & Destructor Documentation

dai::CondProbEstimation::CondProbEstimation	(	size_t	target_dimension,
		const Prob &	pseudocounts
	)

Constructor.

For a conditional probability ,

Parameters

target_dimension	should equal
pseudocounts	are the initial pseudocounts, of length

virtual dai::CondProbEstimation::~CondProbEstimation ( )

inlinevirtual

Virtual destructor.

Member Function Documentation

ParameterEstimation * dai::CondProbEstimation::factory ( const PropertySet &  p )

static

Virtual constructor, using a PropertySet.

Some keys in the PropertySet are required. For a conditional probability ,

• target_dimension should be equal to
• total_dimension should be equal to

An optional key is:

• pseudo_count which specifies the initial counts (defaults to 1)

virtual ParameterEstimation* dai::CondProbEstimation::clone ( ) const

inlinevirtual

Virtual copy constructor.

Implements dai::ParameterEstimation.

Prob dai::CondProbEstimation::parameters ( const Prob &  p )

virtual

Returns an estimate of the conditional probability distribution.

The format of the resulting Prob keeps all the values for in sequential order in the array.

Implements dai::ParameterEstimation.

Prob dai::CondProbEstimation::parametersToFactor ( const Prob &  params )

virtual

Convert a set of estimated parameters to a factor.

Implements dai::ParameterEstimation.

virtual size_t dai::CondProbEstimation::probSize ( ) const

inlinevirtual

Returns the required size for arguments to estimate().

Implements dai::ParameterEstimation.

Member Data Documentation

size_t dai::CondProbEstimation::_target_dim

private

Number of states of the variable of interest.

Prob dai::CondProbEstimation::_initial_stats

private

Initial pseudocounts.

PropertySet dai::CondProbEstimation::_props

private

PropertySet that allows reconstruction of this estimator.

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

• include/dai/emalg.h
• src/emalg.cpp