Examples of org.apache.mahout.cf.taste.similarity.UserSimilarity.userSimilarity()

Package org.apache.mahout.cf.taste.similarity

Class org.apache.mahout.cf.taste.similarity.UserSimilarity

Examples of org.apache.mahout.cf.taste.similarity.UserSimilarity.userSimilarity()

org.apache.mahout.cf.taste.similarity.UserSimilarity.userSimilarity()

Returns the degree of similarity, of two users, based on the their preferences.
@param userID1 first user ID @param userID2 second user ID @return similarity between the two users, in [-1,1] @throws TasteException if an error occurs while accessing the data

    boolean foundAPref = false;
    for (long userID : theNeighborhood) {
      // See GenericItemBasedRecommender.doEstimatePreference() too
      if (userID != theUserID && dataModel.getPreferenceValue(userID, itemID) != null) {
        foundAPref = true;
        totalSimilarity += (float) similarity.userSimilarity(theUserID, userID);
      }
    }
    return foundAPref ? totalSimilarity : Float.NaN;
  }

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