kb.matching

Class SimilarityMeasure

Object

kb.matching.SimilarityMeasure

public class SimilarityMeasure
extends Object

A class to represent the abstraction of similarity between two CG concepts. Takes into account types, supertypes, referents, etc. Considers similarity to be a floating point number between 0 and 1 inclusive.

Author:

Harry S. Delugach (delugach@uah.edu)

Field Summary

Fields

Modifier and Type	Field and Description
(package private) double	similarity

Constructor Summary

Constructors

Constructor and Description
SimilarityMeasure(TypeHierarchy hierarchy, Concept c1, Concept c2) Given two concepts, prepare their similarity measurements.

Method Summary

Modifier and Type	Method and Description
private double	calculateTypeSimilarity() Uses the hierarchy to determine similarity of two types.
double	getSimilarity()
void	setSimilarity(double similarity)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

similarity

double similarity

Constructor Detail

SimilarityMeasure

public SimilarityMeasure(TypeHierarchy hierarchy,
                         Concept c1,
                         Concept c2)

Given two concepts, prepare their similarity measurements.

Parameters:

c1 -

c2 -

Method Detail

getSimilarity

public double getSimilarity()

setSimilarity

public void setSimilarity(double similarity)

calculateTypeSimilarity

private double calculateTypeSimilarity()

Uses the hierarchy to determine similarity of two types. The strategy is to favor shorter numbers of "hops" up and down the hierarchy. A straightforward calculation is to say the similarity is 1 / (number of hops + 1). If two types are the same, then hops is zero and the similarity is one. If there's one hop difference, then hops is one and the similarity is one-half, etc.

Returns: