opencog::FuzzyTruthValue Class Reference

a TruthValue that stores a mean and the number of observations (strength and confidence) More...

#include <FuzzyTruthValue.h>

Inheritance diagram for opencog::FuzzyTruthValue:

Collaboration diagram for opencog::FuzzyTruthValue:

Public Member Functions
	FuzzyTruthValue (strength_t mean, count_t count)
	FuzzyTruthValue (const TruthValue &)
	FuzzyTruthValue (FuzzyTruthValue const &)
virtual bool	operator== (const TruthValue &rhs) const
std::string	toString () const
TruthValueType	getType () const
strength_t	getMean () const
count_t	getCount () const
confidence_t	getConfidence () const
TruthValuePtr	merge (TruthValuePtr, TVMergeStyle ms=DEFAULT) const
TruthValuePtr	clone () const
TruthValue *	rawclone () const
Public Member Functions inherited from opencog::TruthValue
virtual	~TruthValue ()
bool	operator!= (const TruthValue &rhs) const
virtual bool	isNullTv () const
virtual bool	isDefaultTV () const

Static Public Member Functions
static count_t	confidenceToCount (confidence_t)
static confidence_t	countToConfidence (count_t)
static FuzzyTruthValuePtr	createSTV (strength_t mean, count_t count)
static TruthValuePtr	createTV (strength_t mean, count_t count)
Static Public Member Functions inherited from opencog::TruthValue
static TruthValuePtr	NULL_TV ()
static TruthValuePtr	TRUE_TV ()
static TruthValuePtr	DEFAULT_TV ()
static TruthValuePtr	FALSE_TV ()
static TruthValuePtr	TRIVIAL_TV ()

Protected Member Functions
void	init (strength_t mean, count_t count)

Protected Attributes
strength_t	mean
	Mean of the strength of the TV over all observations. More...
count_t	count
	Total number of observations used to estimate the mean. More...

Detailed Description

a TruthValue that stores a mean and the number of observations (strength and confidence)

Definition at line 42 of file FuzzyTruthValue.h.

Constructor & Destructor Documentation

FuzzyTruthValue::FuzzyTruthValue	(	strength_t	mean,
		count_t	count
	)

Definition at line 42 of file FuzzyTruthValue.cc.

References count, reorder_log::m, and mean.

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FuzzyTruthValue::FuzzyTruthValue

(

const TruthValue &

source

)

Definition at line 48 of file FuzzyTruthValue.cc.

References count, opencog::TruthValue::getCount(), opencog::TruthValue::getMean(), and mean.

FuzzyTruthValue::FuzzyTruthValue

(

FuzzyTruthValue const &

source

)

Definition at line 53 of file FuzzyTruthValue.cc.

References count, and mean.

Member Function Documentation

TruthValuePtr opencog::FuzzyTruthValue::clone ( ) const

inlinevirtual

Implements opencog::TruthValue.

Definition at line 99 of file FuzzyTruthValue.h.

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count_t FuzzyTruthValue::confidenceToCount ( confidence_t  cf )

static

Heuristic to compute the count given the confidence (according to the PLN book) count = confidence * k / (1 - confidence) where k is the look-ahead

Definition at line 122 of file FuzzyTruthValue.cc.

References KKK.

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confidence_t FuzzyTruthValue::countToConfidence ( count_t  cn )

static

Heuristic to compute the confidence given the count (according to the PLN book) confidence = count / (count + k) where k is the look-ahead

Definition at line 130 of file FuzzyTruthValue.cc.

References KKK.

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static FuzzyTruthValuePtr opencog::FuzzyTruthValue::createSTV ( strength_t  mean, count_t  count  )

inlinestatic

Definition at line 90 of file FuzzyTruthValue.h.

References count, and mean.

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static TruthValuePtr opencog::FuzzyTruthValue::createTV ( strength_t  mean, count_t  count  )

inlinestatic

Definition at line 94 of file FuzzyTruthValue.h.

References createSTV().

confidence_t FuzzyTruthValue::getConfidence ( ) const

virtual

Implements opencog::TruthValue.

Definition at line 69 of file FuzzyTruthValue.cc.

References count, and countToConfidence().

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count_t FuzzyTruthValue::getCount ( ) const

virtual

Implements opencog::TruthValue.

Definition at line 64 of file FuzzyTruthValue.cc.

References count.

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strength_t FuzzyTruthValue::getMean ( ) const

virtual

Implements opencog::TruthValue.

Definition at line 59 of file FuzzyTruthValue.cc.

References mean.

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TruthValueType FuzzyTruthValue::getType ( ) const

virtual

Implements opencog::TruthValue.

Definition at line 117 of file FuzzyTruthValue.cc.

References opencog::FUZZY_TRUTH_VALUE.

void opencog::FuzzyTruthValue::init ( strength_t  mean, count_t  count  )

protected

TruthValuePtr FuzzyTruthValue::merge ( TruthValuePtr  other, TVMergeStyle  ms = DEFAULT  ) const

virtual

Truth value merge formula, as specified by PLN.

Currently tv1.merge(tv2) works as follows: the resulting TV is either tv1 or tv2, the result being the one with the highest confidence.

Implements opencog::TruthValue.

Definition at line 75 of file FuzzyTruthValue.cc.

References clone(), getConfidence(), and opencog::SIMPLE_TRUTH_VALUE.

bool FuzzyTruthValue::operator== ( const TruthValue &  rhs ) const

virtual

Equality. Used to determine if two truth values are the same, or not. Primarily useful see if a TV is equal to NULL_TV, TRUE_TV, FALSE_TV, etc.

Implements opencog::TruthValue.

Definition at line 98 of file FuzzyTruthValue.cc.

References count, FLOAT_ACCEPTABLE_COUNT_ERROR, FLOAT_ACCEPTABLE_MEAN_ERROR, and mean.

TruthValue* opencog::FuzzyTruthValue::rawclone ( ) const

inlinevirtual

Implements opencog::TruthValue.

Definition at line 103 of file FuzzyTruthValue.h.

References FuzzyTruthValue().

std::string FuzzyTruthValue::toString ( ) const

virtual

Implements opencog::TruthValue.

Definition at line 89 of file FuzzyTruthValue.cc.

References getConfidence(), and getMean().

Member Data Documentation

count_t opencog::FuzzyTruthValue::count

protected

Total number of observations used to estimate the mean.

Definition at line 50 of file FuzzyTruthValue.h.

strength_t opencog::FuzzyTruthValue::mean

protected

Mean of the strength of the TV over all observations.

Definition at line 47 of file FuzzyTruthValue.h.

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

• opencog/atomspace/FuzzyTruthValue.h
• opencog/atomspace/FuzzyTruthValue.cc