Package es.uam.eps.ir.relison.links.recommendation.reranking.global.local.communities

Class InterCommunityDegreeGiniComplement<U>

java.lang.Object
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalReranker<U,​I>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalGreedyReranker<U,​I>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalLambdaReranker<U,​U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.GraphLocalReranker<U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.communities.InterCommunityReranker<U>
es.uam.eps.ir.relison.links.recommendation.reranking.global.local.communities.InterCommunityDegreeGiniComplement<U>
Type Parameters:
U - type of the users
All Implemented Interfaces:
GlobalReranker<U,​U>
public class InterCommunityDegreeGiniComplement<U>
extends InterCommunityReranker<U>
Implementation of a reranking strategy for balancing the distribution of the degrees of the communities in a community graph. It only considers links between communities.

  • Field Summary

    Fields 
    Modifier and Type Field Description
    protected java.util.Map<java.lang.Integer,​java.lang.Integer> degrees
    The community degrees
    protected EdgeOrientation orientation
    The orientation which indicates which community degree to use
    protected double sum
    The total number of edges between communities.

    Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.communities.InterCommunityReranker

    communities, communityGraph

    Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.GraphLocalReranker

    graph

    Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalLambdaReranker

    novMap, novStats, relStats

    Fields inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalGreedyReranker

    cutOff

  • Constructor Summary

    Constructors 
    Constructor Description
    InterCommunityDegreeGiniComplement​(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, Communities<U> communities, EdgeOrientation orientation)
    Constructor.

  • Method Summary

    Modifier and Type Method Description
    protected void innerUpdate​(U user, org.ranksys.core.util.tuples.Tuple2od<U> iv)
    Updates the different parameters of the reranker, further than changing the edges in the graph.
    protected double nov​(U u, org.ranksys.core.util.tuples.Tuple2od<U> iv)
    Novelty score.
    protected void update​(es.uam.eps.ir.ranksys.core.Recommendation<U,​U> reranked)
    Updates the values, given a new recommendation.

    Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.GraphLocalReranker

    update

    Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalLambdaReranker

    rerankPermutation, selectItem, value

    Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalGreedyReranker

    getBasePerm, rerankRecommendation

    Methods inherited from class es.uam.eps.ir.relison.links.recommendation.reranking.global.local.LocalReranker

    rerankRecommendations

    Methods inherited from class java.lang.Object

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

  • Field Details

    • orientation

      protected final EdgeOrientation orientation
      The orientation which indicates which community degree to use

    • degrees

      protected java.util.Map<java.lang.Integer,​java.lang.Integer> degrees
      The community degrees

    • sum

      protected double sum
      The total number of edges between communities.

  • Constructor Details

    • InterCommunityDegreeGiniComplement

      public InterCommunityDegreeGiniComplement​(double lambda, int cutoff, java.util.function.Supplier<Normalizer<U>> norm, Graph<U> graph, Communities<U> communities, EdgeOrientation orientation)
      Constructor.
      Parameters:
      lambda - trade-off between the recommendation score and the novelty/diversity value.
      cutoff - number of elements to take.
      norm - the normalization strategy.
      graph - the original graph.
      communities - the relation between users and communities.
      orientation - the neighborhood selection for computing the degree.

  • Method Details

    • nov

      protected double nov​(U u, org.ranksys.core.util.tuples.Tuple2od<U> iv)
      Description copied from class: LocalLambdaReranker
      Novelty score.
      Specified by:
      nov in class LocalLambdaReranker<U,​U>
      Parameters:
      u - the target user.
      iv - the recommended item and its recommendation score.
      Returns:
      the novelty for this pair user-item.

    • innerUpdate

      protected void innerUpdate​(U user, org.ranksys.core.util.tuples.Tuple2od<U> iv)
      Description copied from class: GraphLocalReranker
      Updates the different parameters of the reranker, further than changing the edges in the graph.
      Specified by:
      innerUpdate in class GraphLocalReranker<U>
      Parameters:
      user - the target user.
      iv - the new candidate user.

    • update

      protected void update​(es.uam.eps.ir.ranksys.core.Recommendation<U,​U> reranked)
      Description copied from class: LocalReranker
      Updates the values, given a new recommendation.
      Specified by:
      update in class LocalReranker<U,​U>
      Parameters:
      reranked - the reranked recommendation.