Package es.uam.eps.ir.relison.links.recommendation.algorithms.standalone.pathbased

Class GlobalLHNIndex<U>

java.lang.Object

es.uam.eps.ir.ranksys.rec.AbstractRecommender<U,I>

es.uam.eps.ir.ranksys.rec.fast.AbstractFastRecommender<U,I>

es.uam.eps.ir.ranksys.rec.fast.FastRankingRecommender<U,U>

es.uam.eps.ir.relison.links.recommendation.UserFastRankingRecommender<U>

es.uam.eps.ir.relison.links.recommendation.algorithms.MatrixBasedRecommender<U>

es.uam.eps.ir.relison.links.recommendation.algorithms.GlobalMatrixBasedRecommender<U>

es.uam.eps.ir.relison.links.recommendation.algorithms.standalone.pathbased.GlobalLHNIndex<U>

Type Parameters:

U - Type of the users

All Implemented Interfaces:

es.uam.eps.ir.ranksys.core.index.ItemIndex<U>, es.uam.eps.ir.ranksys.core.index.UserIndex<U>, es.uam.eps.ir.ranksys.fast.index.FastItemIndex<U>, es.uam.eps.ir.ranksys.fast.index.FastUserIndex<U>, es.uam.eps.ir.ranksys.rec.fast.FastRecommender<U,U>, es.uam.eps.ir.ranksys.rec.Recommender<U,U>

public class GlobalLHNIndex<U>
extends GlobalMatrixBasedRecommender<U>

Global Leicht-Holme-Newman similarity algorithm.

Reference: E.A. Leicht, P. Holme, M.E.J. Newman. Vertex similarity in networks. Physical Review E 73(2): 026120 (2006)

Field Summary

Fields

Modifier and Type	Field	Description
private EdgeOrientation	orient	The orientation selection for the adjacency matrix.
private double	phi	The decay factor of the similarity.

Fields inherited from class es.uam.eps.ir.relison.links.recommendation.algorithms.GlobalMatrixBasedRecommender

matrix

Fields inherited from class es.uam.eps.ir.relison.links.recommendation.algorithms.MatrixBasedRecommender

library

Fields inherited from class es.uam.eps.ir.relison.links.recommendation.UserFastRankingRecommender

graph

Fields inherited from class es.uam.eps.ir.ranksys.rec.fast.AbstractFastRecommender

iIndex, uIndex

Constructor Summary

Constructors

Constructor	Description
GlobalLHNIndex(FastGraph<U> graph, double phi)	Constructor.
GlobalLHNIndex(FastGraph<U> graph, double phi, EdgeOrientation orient)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected double[][]	getCOLTMatrix()	Obtains the matrix using the COLT library.
protected double[][]	getJBLASMatrix()	Obtains the matrix using the JBLAS library.
protected double[][]	getMTJMatrix()	Obtains the matrix using the MTJ library.

Methods inherited from class es.uam.eps.ir.relison.links.recommendation.algorithms.GlobalMatrixBasedRecommender

getCOLTMatrix, getJBLASMatrix, getMatrix, getMTJMatrix

Methods inherited from class es.uam.eps.ir.relison.links.recommendation.algorithms.MatrixBasedRecommender

getMatrix, getScoresMap

Methods inherited from class es.uam.eps.ir.relison.links.recommendation.UserFastRankingRecommender

getFreq, getFreq, getGraph

Methods inherited from class es.uam.eps.ir.ranksys.rec.fast.FastRankingRecommender

getRecommendation

Methods inherited from class es.uam.eps.ir.ranksys.rec.fast.AbstractFastRecommender

getRecommendation, getRecommendation, getRecommendation, getRecommendation, getRecommendation, getRecommendation, getRecommendation, iidx2item, item2iidx, numItems, numUsers, uidx2user, user2uidx

Methods inherited from class es.uam.eps.ir.ranksys.rec.AbstractRecommender

getRecommendation, getRecommendation

Methods inherited from class java.lang.Object

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

Methods inherited from interface es.uam.eps.ir.ranksys.fast.index.FastItemIndex

containsItem, getAllIidx, getAllItems, iidx2item, iidx2item, item2iidx, item2iidx

Methods inherited from interface es.uam.eps.ir.ranksys.fast.index.FastUserIndex

containsUser, getAllUidx, getAllUsers, uidx2user, uidx2user, user2uidx, user2uidx

Methods inherited from interface es.uam.eps.ir.ranksys.rec.Recommender

getRecommendation, getRecommendation

Field Details

phi

private final double phi

The decay factor of the similarity.

orient

private final EdgeOrientation orient

The orientation selection for the adjacency matrix.

Constructor Details

GlobalLHNIndex

public GlobalLHNIndex(FastGraph<U> graph, double phi)

Constructor. By default, considers networks as undirected.

Parameters:

graph - a fast graph representing the social network.

phi - the decay factor of the similarity.

GlobalLHNIndex

public GlobalLHNIndex(FastGraph<U> graph, double phi, EdgeOrientation orient)

Constructor. By default, considers networks as undirected.

Parameters:

graph - a fast graph representing the social network.

phi - the decay factor for the similarity.

orient - the orientation for selecting the adjacency matrix.

Method Details

getJBLASMatrix

protected double[][] getJBLASMatrix()

Description copied from class: GlobalMatrixBasedRecommender

Obtains the matrix using the JBLAS library.

Specified by:

getJBLASMatrix in class GlobalMatrixBasedRecommender<U>

Returns:

the matrix.

getCOLTMatrix

protected double[][] getCOLTMatrix()

Description copied from class: GlobalMatrixBasedRecommender

Obtains the matrix using the COLT library.

Specified by:

getCOLTMatrix in class GlobalMatrixBasedRecommender<U>

Returns:

the matrix.

getMTJMatrix

protected double[][] getMTJMatrix()

Description copied from class: GlobalMatrixBasedRecommender

Obtains the matrix using the MTJ library.

Specified by:

getMTJMatrix in class GlobalMatrixBasedRecommender<U>

Returns:

the matrix.