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

Class MatrixBasedRecommender<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>
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>
Direct Known Subclasses:
AbstractHittingTime, GlobalMatrixBasedRecommender
public abstract class MatrixBasedRecommender<U>
extends UserFastRankingRecommender<U>
Abstract implementation of a contact recommendation algorithm that depends on matrix operations.

  • Field Summary

    Fields 
    Modifier and Type Field Description
    protected MatrixLibrary library
    The matrix library to consider.

    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
    MatrixBasedRecommender​(FastGraph<U> graph)
    Default constructor.
    MatrixBasedRecommender​(FastGraph<U> graph, MatrixLibrary library)
    Constructor.

  • Method Summary

    Modifier and Type Method Description
    protected abstract double[][] getCOLTMatrix​(int uidx)
    Obtains the matrix that provides the ratings given the target user, using the COLT library.
    protected abstract double[][] getJBLASMatrix​(int uidx)
    Obtains the matrix that provides the ratings given the target user, using the JBLAS library.
    double[][] getMatrix​(int uidx)
    Obtains the matrix that provides the ratings given the target user.
    protected abstract double[][] getMTJMatrix​(int uidx)
    Obtains the matrix that provides the ratings given the target user, using the MTJ library.
    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

  • Constructor Details

    • MatrixBasedRecommender

      public MatrixBasedRecommender​(FastGraph<U> graph, MatrixLibrary library)
      Constructor.
      Parameters:
      graph - a fast graph representing the social network.
      library - the matrix library to use.

    • MatrixBasedRecommender

      public MatrixBasedRecommender​(FastGraph<U> graph)
      Default constructor. If possible, uses the JBLAS library. Otherwise, it takes the COLT library.
      Parameters:
      graph - a fast graph representing the social network.

  • 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>

    • getMatrix

      public double[][] getMatrix​(int uidx)
      Obtains the matrix that provides the ratings given the target user.
      Parameters:
      uidx - the target user.
      Returns:
      the matrix containing the item scores in the uidx row.

    • getJBLASMatrix

      protected abstract double[][] getJBLASMatrix​(int uidx)
      Obtains the matrix that provides the ratings given the target user, using the JBLAS library.
      Parameters:
      uidx - the target user.
      Returns:
      the matrix containing the item scores in the uidx row.

    • getCOLTMatrix

      protected abstract double[][] getCOLTMatrix​(int uidx)
      Obtains the matrix that provides the ratings given the target user, using the COLT library.
      Parameters:
      uidx - the target user.
      Returns:
      the matrix containing the item scores in the uidx row.

    • getMTJMatrix

      protected abstract double[][] getMTJMatrix​(int uidx)
      Obtains the matrix that provides the ratings given the target user, using the MTJ library.
      Parameters:
      uidx - the target user.
      Returns:
      the matrix containing the item scores in the uidx row.