es.ucm.fdi.gaia.recolibry.implementations.mahout.cfItem

Class MahoutItemSimilarity

java.lang.Object

es.ucm.fdi.gaia.recolibry.implementations.mahout.cfItem.MahoutItemSimilarity

All Implemented Interfaces:

org.apache.mahout.cf.taste.common.Refreshable, org.apache.mahout.cf.taste.similarity.ItemSimilarity

public class MahoutItemSimilarity
extends Object
implements org.apache.mahout.cf.taste.similarity.ItemSimilarity

Class to select the similarity function to apply in the RecommenderMahoutCFItem. There are 6 functions to select: CityBlock, Euclidean, LogLike, Pearson, Tanimoto nad UncenteredCosine.

Version:

1.0

Author:

Jose L. Jorro-Aragoneses

Constructor Summary

Constructors

Constructor and Description
MahoutItemSimilarity(String type, DataModelFactory dataModel) Method to build the similarity function.

Method Summary

Modifier and Type	Method and Description
long[]	allSimilarItemIDs(long itemID)
double[]	itemSimilarities(long itemID1, long[] itemID2s)
double	itemSimilarity(long itemID1, long itemID2)
void	refresh(Collection<org.apache.mahout.cf.taste.common.Refreshable> alreadyRefreshed)

Methods inherited from class java.lang.Object

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

Constructor Detail

MahoutItemSimilarity

@Inject
public MahoutItemSimilarity(String type,
                                    DataModelFactory dataModel)

Method to build the similarity function.

Parameters:

type - type of similarity function selected.

dataModel - data model where is applied this similarity function.

Method Detail

itemSimilarity

public double itemSimilarity(long itemID1,
                             long itemID2)
                      throws org.apache.mahout.cf.taste.common.TasteException

Specified by:

itemSimilarity in interface org.apache.mahout.cf.taste.similarity.ItemSimilarity

Throws:

org.apache.mahout.cf.taste.common.TasteException

itemSimilarities

public double[] itemSimilarities(long itemID1,
                                 long[] itemID2s)
                          throws org.apache.mahout.cf.taste.common.TasteException

Specified by:

itemSimilarities in interface org.apache.mahout.cf.taste.similarity.ItemSimilarity

Throws:

org.apache.mahout.cf.taste.common.TasteException

allSimilarItemIDs

public long[] allSimilarItemIDs(long itemID)
                         throws org.apache.mahout.cf.taste.common.TasteException

Specified by:

allSimilarItemIDs in interface org.apache.mahout.cf.taste.similarity.ItemSimilarity

Throws:

org.apache.mahout.cf.taste.common.TasteException

refresh

public void refresh(Collection<org.apache.mahout.cf.taste.common.Refreshable> alreadyRefreshed)

Specified by:

refresh in interface org.apache.mahout.cf.taste.common.Refreshable