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

Class Katz<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.Katz<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 Katz<U>
extends GlobalMatrixBasedRecommender<U>
Katz algorithm. This algorithm weights the paths between two users, giving more weight to those at closer distances.
References:
  1. L. Katz. A new status index derived from sociometric analysis. Psychometrika 18(1), 39-43 (1953)
  2. D. Liben-Nowell, D., J. Kleinberg. The Link Prediction Problem for Social Networks. Journal of the American Society for Information Science and Technology 58(7) (2007)

  • Field Summary

    Fields 
    Modifier and Type Field Description
    private double b
    Dampening factor.
    private EdgeOrientation orient
    Edge orientation to take.

    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
    Katz​(FastGraph<U> graph, double b)
    Constructor.
    Katz​(FastGraph<U> graph, double b, EdgeOrientation orient)
    Constructor.

  • Method Summary

    Modifier and Type Method Description
    protected double[][] getCOLTMatrix()
    Obtains the matrix for the recommendation
    protected double[][] getJBLASMatrix()
    Obtains the matrix for the recommendation.
    protected double[][] getMTJMatrix()
    Obtains the matrix for the recommendation

    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

    • b

      private final double b
      Dampening factor.

    • orient

      private final EdgeOrientation orient
      Edge orientation to take.

  • Constructor Details

    • Katz

      public Katz​(FastGraph<U> graph, double b)
      Constructor. Uses, by default, the classical orientation (OUT).
      Parameters:
      graph - a fast graph representing the social network.
      b - the dampening factor.

    • Katz

      public Katz​(FastGraph<U> graph, double b, EdgeOrientation orient)
      Constructor.
      Parameters:
      graph - a fast graph representing the social network.
      b - the dampening factor.
      orient - the orientation for the adjacency matrix.

  • Method Details