Package es.uam.eps.ir.relison.links.recommendation.updateable.knn.sim

Interface UpdateableSimilarity

All Superinterfaces:
es.uam.eps.ir.ranksys.nn.sim.Similarity
All Known Implementing Classes:
UpdateableGraphCosineSimilarity, UpdateableGraphSimilarity
public interface UpdateableSimilarity
extends es.uam.eps.ir.ranksys.nn.sim.Similarity
Generic updateable similarity for fast data. This is the interface that is under the hood of user and item similarities. It does not need to be symmetric.

  • Method Summary

    Modifier and Type Method Description
    it.unimi.dsi.fastutil.ints.IntList updateAdd​(int idx1, int idx2, double val)
    Updates the similarities between user/items after adding/modifying a rating.
    void updateAddElement()
    Updates the similarities between users/items after adding a new element.
    void updateDel​(int idx1, int idx2)
    Updates the similarities between users/items after removing a rating.

    Methods inherited from interface es.uam.eps.ir.ranksys.nn.sim.Similarity

    similarElems, similarity, similarity

  • Method Details

    • updateAdd

      it.unimi.dsi.fastutil.ints.IntList updateAdd​(int idx1, int idx2, double val)
      Updates the similarities between user/items after adding/modifying a rating.
      Parameters:
      idx1 - index of user
      idx2 - index of item
      val - rating value
      Returns:
      a pair which contains a) a list of users which have been fully updated b) a list of other updated similarities.

    • updateDel

      void updateDel​(int idx1, int idx2)
      Updates the similarities between users/items after removing a rating.
      Parameters:
      idx1 - index of user
      idx2 - index of item

    • updateAddElement

      void updateAddElement()
      Updates the similarities between users/items after adding a new element.