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

Class AdamicAdar<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.standalone.foaf.AdamicAdar<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 AdamicAdar<U>
extends UserFastRankingRecommender<U>
Recommender that uses the Adamic-Adar coefficient of the neighbours. It weights the common neighbors between the target and the candidate users by the inverse of the logarithm of the degree of such common user.

Reference: Adamic, L.A., Adar, E.: Friends and neighbors on the Web. Social Networks, 25(3), 211–230 (2003)

  • Field Summary

    Fields 
    Modifier and Type Field Description
    private EdgeOrientation uSel
    Neighborhood selection for the target users.
    private EdgeOrientation vSel
    Neighborhood selection for the candidate users.
    private EdgeOrientation wSel
    Neighborhood selection for the intermediate users
    private it.unimi.dsi.fastutil.ints.Int2DoubleMap wSizes
    Map containing the length of the common neighborhoods between target and candidate users.

    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
    AdamicAdar​(FastGraph<U> graph, EdgeOrientation uSel, EdgeOrientation vSel, EdgeOrientation wSel)
    Constructor.

  • Method Summary

    Modifier and Type Method Description
    it.unimi.dsi.fastutil.ints.Int2DoubleMap getScoresMap​(int uidx)  

    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

    • wSizes

      private final it.unimi.dsi.fastutil.ints.Int2DoubleMap wSizes
      Map containing the length of the common neighborhoods between target and candidate users.

    • uSel

      private final EdgeOrientation uSel
      Neighborhood selection for the target users.

    • vSel

      private final EdgeOrientation vSel
      Neighborhood selection for the candidate users.

    • wSel

      private final EdgeOrientation wSel
      Neighborhood selection for the intermediate users

  • Constructor Details

    • AdamicAdar

      public AdamicAdar​(FastGraph<U> graph, EdgeOrientation uSel, EdgeOrientation vSel, EdgeOrientation wSel)
      Constructor.
      Parameters:
      graph - the graph.
      uSel - the neighborhood selection for the target user.
      vSel - the neighborhood selection for the candidate user.
      wSel - the neighborhood selection for the users in the intersection

  • Method Details

    • getScoresMap

      public it.unimi.dsi.fastutil.ints.Int2DoubleMap getScoresMap​(int uidx)
      Specified by:
      getScoresMap in class es.uam.eps.ir.ranksys.rec.fast.FastRankingRecommender<U,​U>