de.psychometrica.lsa

Class LSATools

java.lang.Object

de.psychometrica.lsa.LSATools

public class LSATools
extends java.lang.Object

The LSATools include some convenience methods for computing cosines and euclidean distances for semantic vectors

Constructor Summary

Constructors

Constructor and Description
LSATools()

Method Summary

Methods

Modifier and Type	Method and Description
static float	cosine(float[] x, float[] y) return the cosine between two vectors
static float	getCosine(SemanticVector vector1, SemanticVector vector2) returns the cosine between two vectors using the cosine measure
static float	getCosine(java.lang.String source, java.lang.String target) returns the cosine between two texts using the cosine measure
static float	getDistance(SemanticVector vector1, SemanticVector vector2) Compute the euclidean distance between two vectors within the semantic space
static float	getDistance(java.lang.String source, java.lang.String target) Compute the euclidean distance between two texts within the semantic space
static SemanticVector	getVector(java.lang.String text) returns a SemanticVector for an given text
static SemanticVector[]	getVectors(java.lang.String[] texts) returns an array of SemanticVector for a string array of texts

Methods inherited from class java.lang.Object

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

Constructor Detail

LSATools

public LSATools()

Method Detail

getCosine

public static float getCosine(java.lang.String source,
              java.lang.String target)

returns the cosine between two texts using the cosine measure

Parameters:

source - one text

target - the other text

Returns:

similarity between the two texts

getCosine

public static float getCosine(SemanticVector vector1,
              SemanticVector vector2)

returns the cosine between two vectors using the cosine measure

Parameters:

vector1 - the first vector

vector2 - the second vector

Returns:

similarity between the two texts

getVectors

public static SemanticVector[] getVectors(java.lang.String[] texts)

returns an array of SemanticVector for a string array of texts

Parameters:

texts - Array of Strings

Returns:

array of SemanticVector for a string array of texts

getVector

public static SemanticVector getVector(java.lang.String text)

returns a SemanticVector for an given text

Parameters:

text - Simple text

Returns:

SemanticVector for an given text

cosine

public static float cosine(float[] x,
           float[] y)

return the cosine between two vectors

Parameters:

x - coordinates of vector 1

y - coordinates of vector 2

Returns:

getDistance

public static float getDistance(SemanticVector vector1,
                SemanticVector vector2)

Compute the euclidean distance between two vectors within the semantic space

Parameters:

vector1 - First vector

vector2 - Second vector

Returns:

the distance

getDistance

public static float getDistance(java.lang.String source,
                java.lang.String target)

Compute the euclidean distance between two texts within the semantic space

Parameters:

source - First text

target - Second text

Returns:

the distance