org.apache.mahout.cf.taste.impl.recommender.svd

Class Factorization

java.lang.Object

org.apache.mahout.cf.taste.impl.recommender.svd.Factorization

public class Factorization
extends Object

a factorization of the rating matrix

Constructor Summary

Constructors

Constructor and Description
Factorization(FastByIDMap<Integer> userIDMapping, FastByIDMap<Integer> itemIDMapping, double[][] userFeatures, double[][] itemFeatures)

Method Summary

Modifier and Type	Method and Description
double[][]	allItemFeatures()
double[][]	allUserFeatures()
boolean	equals(Object o)
double[]	getItemFeatures(long itemID)
LongPrimitiveIterator	getItemIDMappingKeys()
Iterable<Map.Entry<Long,Integer>>	getItemIDMappings()
double[]	getUserFeatures(long userID)
LongPrimitiveIterator	getUserIDMappingKeys()
Iterable<Map.Entry<Long,Integer>>	getUserIDMappings()
int	hashCode()
int	itemIndex(long itemID)
int	numFeatures()
int	numItems()
int	numUsers()
int	userIndex(long userID)

Methods inherited from class java.lang.Object

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

Constructor Detail

Factorization

public Factorization(FastByIDMap<Integer> userIDMapping,
                     FastByIDMap<Integer> itemIDMapping,
                     double[][] userFeatures,
                     double[][] itemFeatures)

Method Detail

allUserFeatures

public double[][] allUserFeatures()

getUserFeatures

public double[] getUserFeatures(long userID)
                         throws NoSuchUserException

Throws:

NoSuchUserException

allItemFeatures

public double[][] allItemFeatures()

getItemFeatures

public double[] getItemFeatures(long itemID)
                         throws NoSuchItemException

Throws:

NoSuchItemException

userIndex

public int userIndex(long userID)
              throws NoSuchUserException

Throws:

NoSuchUserException

getUserIDMappings

public Iterable<Map.Entry<Long,Integer>> getUserIDMappings()

getUserIDMappingKeys

public LongPrimitiveIterator getUserIDMappingKeys()

itemIndex

public int itemIndex(long itemID)
              throws NoSuchItemException

Throws:

NoSuchItemException

getItemIDMappings

public Iterable<Map.Entry<Long,Integer>> getItemIDMappings()

getItemIDMappingKeys

public LongPrimitiveIterator getItemIDMappingKeys()

numFeatures

public int numFeatures()

numUsers

public int numUsers()

numItems

public int numItems()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object