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CWeightingFunction Class Reference

a universally usable class for weighting. More...

#include <CWeightingFunction.h>

Inheritance diagram for CWeightingFunction:

CWFBestFullyWeighted CWFBestProbabilistic CWFBinaryTerm CWFClassicalIDF CWFCoordinationLevel CWFProbability CWFStandardTF List of all members.

Public Member Functions

double getQueryFactor () const
virtual void preCalculate ()
 CWeightingFunction (const CAcInvertedFile *inAccessor=0, CQueryNormalizer *inQueryNormalizer=0, CQueryNormalizer *inThisNormalizer=0)
void setAccessor (const CAcInvertedFile *)
void setNormalizers (CQueryNormalizer *inQueryNormalizer, CQueryNormalizer *inThisNormalizer)
void setID (TID)
TID getID () const
void setRelevanceSum (double inPositiveRelevanceSum, double inNegativeRelevanceSum)
virtual void addQueryFeature (double inRelevanceLevel, const CDocumentFrequencyElement &inQueryFeature)
virtual double getTermFrequency () const
virtual double subApply (const double inDocumentFrequency, const double inNormalizingFactor) const
virtual double apply (const CDocumentFrequencyElement &inResultFeature) const
double applyOnThis () const
virtual CWeightingFunctionconstructNew (TID inID) const
 For the "prototype pattern": Kinda virtual copy constructor: Gamma/Helm/Johnson/Vlissides p.
virtual CWeightingFunctionclone () const
 For the "prototype pattern": Kinda virtual copy constructor: Gamma/Helm/Johnson/Vlissides p.
virtual ~CWeightingFunction ()
 This virtual destructor is here inorder to call the (inherited) default constructors.

Protected Attributes

double mPositiveRelevanceSum
 This value depends on all the elements of the query, which have a positive user-assigned relevance.
double mNegativeRelevanceSum
 This value depends on all the elements of the query, which have a negative user-assigned relevance.
double mPositiveTermFrequency
double mNegativeTermFrequency
int mFeatureDescription
 At present the feature description is a simple integer which expresses if the feature is a histogram feature or not and if it is a texture feature or not.
TID mID
const CAcInvertedFilemAccessor
 The accessor for the file on which the query is performed.
CQueryNormalizermQueryNormalizer
 FIXME THERE IS A GOOD DESCRIPTION MISSING FOR THE NEXT TWO VARIABLES.
CQueryNormalizermThisNormalizer
 A normalizer for apply on self.
double mQueryFactor
 The query usually will separate into a part which is equal for all the query and a part which is to be calculated for each document.
double mDocumentFactor

Friends

class CSortByDFTimesLogICF_WF

Detailed Description

a universally usable class for weighting.

The rationale is, that we want to implement very flexible feature weighting, so flexible that it does not necessarily have anything to do with the initial concept of feature weighting.

The scenario: We have query/feedback from the user. That is: We have a list of images with either positive or negative relevance for the user. Each of these images contains a list of features.

Now we want to combine the different features. What we usually need to know is: how many images where in the positive feedback, and how many images where in the negative feedback.


Constructor & Destructor Documentation

CWeightingFunction::CWeightingFunction const CAcInvertedFile inAccessor = 0,
CQueryNormalizer inQueryNormalizer = 0,
CQueryNormalizer inThisNormalizer = 0
 

Constructor:

Parameters:
inAccessor,: the accessor containing this \ (for getting information about single documents)
inQueryNormalizer,: FIXME
inThisNormalizer,: FIXME


Member Function Documentation

virtual void CWeightingFunction::addQueryFeature double  inRelevanceLevel,
const CDocumentFrequencyElement inQueryFeature
[virtual]
 

Add a feature. A feature will be a document frequency element out of the feature file.

virtual double CWeightingFunction::apply const CDocumentFrequencyElement inResultFeature  )  const [virtual]
 

Preparing the right parameters for subApply: Apply this on another feature

Reimplemented in CWFBestFullyWeighted, CWFBestProbabilistic, and CWFStandardTF.

double CWeightingFunction::applyOnThis  )  const
 

Preparing the right parameters for subApply: Apply this on itself

virtual CWeightingFunction* CWeightingFunction::clone  )  const [virtual]
 

For the "prototype pattern": Kinda virtual copy constructor: Gamma/Helm/Johnson/Vlissides p.

107

This is a new version of constructNew which manages to live without the setID function

Reimplemented in CWFBestFullyWeighted, CWFBestProbabilistic, CWFBinaryTerm, CWFClassicalIDF, CWFCoordinationLevel, CWFProbability, and CWFStandardTF.

virtual CWeightingFunction* CWeightingFunction::constructNew TID  inID  )  const [virtual]
 

For the "prototype pattern": Kinda virtual copy constructor: Gamma/Helm/Johnson/Vlissides p.

107

TID CWeightingFunction::getID  )  const
 

get the ID of this feature

double CWeightingFunction::getQueryFactor  )  const
 

The query factor contains all informatio which depends only on the query. (for efficiency)

virtual double CWeightingFunction::getTermFrequency  )  const [virtual]
 

Giving a pseudo term frequency for normalization

virtual void CWeightingFunction::preCalculate  )  [virtual]
 

Calculate the QueryFactor.

Reimplemented in CWFClassicalIDF.

void CWeightingFunction::setAccessor const CAcInvertedFile  ) 
 

Set the accessor (should not be needed)

void CWeightingFunction::setID TID   ) 
 

Set the ID of this feature

void CWeightingFunction::setNormalizers CQueryNormalizer inQueryNormalizer,
CQueryNormalizer inThisNormalizer
 

Set the query normalizer (should not be needed);

void CWeightingFunction::setRelevanceSum double  inPositiveRelevanceSum,
double  inNegativeRelevanceSum
 

Setting the relevance sum, that is the sum of the absolute values of all relevance levels of all documents of the query

for rocchio we need this sum to be once calculated for positive, once for negative feedback images

virtual double CWeightingFunction::subApply const double  inDocumentFrequency,
const double  inNormalizingFactor
const [virtual]
 

Apply this on a document frequency

Reimplemented in CWFBestFullyWeighted, CWFBestProbabilistic, CWFBinaryTerm, CWFClassicalIDF, CWFCoordinationLevel, CWFProbability, and CWFStandardTF.


Member Data Documentation

int CWeightingFunction::mFeatureDescription [protected]
 

At present the feature description is a simple integer which expresses if the feature is a histogram feature or not and if it is a texture feature or not.

We probably will use more elaborate descriptions in the future.

double CWeightingFunction::mNegativeRelevanceSum [protected]
 

This value depends on all the elements of the query, which have a negative user-assigned relevance.

i.e. not necessarily only on the elements which contain this feature, so it has to be explicitly set using the function setRelevanceSum from the outside.

If relevance=+-1 then this is the number of negative images in the query

double CWeightingFunction::mPositiveRelevanceSum [protected]
 

This value depends on all the elements of the query, which have a positive user-assigned relevance.

i.e. not necessarily only on the elements which contain this feature, so it has to be explicitly set using the function setRelevanceSum from the outside.

If relevance=+-1 then this is the number of positive images in the query

double CWeightingFunction::mQueryFactor [protected]
 

The query usually will separate into a part which is equal for all the query and a part which is to be calculated for each document.

The part which stays constant


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