es.uam.eps.ir.ranksys.rec.fast

Class FastRankingRecommender<U,I>

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,I>

Type Parameters:

U - type of the users

I - type of the items

All Implemented Interfaces:

ItemIndex<I>, UserIndex<U>, FastItemIndex<I>, FastUserIndex<U>, FastRecommender<U,I>, Recommender<U,I>

Direct Known Subclasses:

FastEnsembleRecommender, ItemNeighborhoodRecommender, UserNeighborhoodRecommender

public abstract class FastRankingRecommender<U,I>
extends AbstractFastRecommender<U,I>

Recommender for top-n recommendations. It selects and orders the items whose predicted scores are among the n greatest.

Author:

Saúl Vargas (saul.vargas@uam.es)

Field Summary

Fields inherited from class es.uam.eps.ir.ranksys.rec.fast.AbstractFastRecommender

iIndex, uIndex

Constructor Summary

Constructors

Constructor and Description
FastRankingRecommender(FastUserIndex<U> uIndex, FastItemIndex<I> iIndex) Constructor.

Method Summary

Modifier and Type	Method and Description
FastRecommendation	getRecommendation(int uidx, int maxLength, IntPredicate filter) Filter recommendation.
abstract it.unimi.dsi.fastutil.ints.Int2DoubleMap	getScoresMap(int uidx) Returns a map of item-score pairs.

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.rec.Recommender

getRecommendation, getRecommendation

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.fast.index.FastItemIndex

containsItem, getAllIidx, getAllItems, iidx2item, iidx2item, item2iidx, item2iidx

Constructor Detail

FastRankingRecommender

public FastRankingRecommender(FastUserIndex<U> uIndex,
                              FastItemIndex<I> iIndex)

Constructor.

Parameters:

uIndex - user index

iIndex - item index

Method Detail

getRecommendation

public FastRecommendation getRecommendation(int uidx,
                                            int maxLength,
                                            IntPredicate filter)

Description copied from interface: FastRecommender

Filter recommendation. Recommends only the items that pass the filter up to a maximum list size.

Specified by:

getRecommendation in interface FastRecommender<U,I>

Specified by:

getRecommendation in class AbstractFastRecommender<U,I>

Parameters:

uidx - index of the user to be issued a recommendation

maxLength - maximum length of recommendation

filter - (fast) filter to decide which items might be recommended

Returns:

a (fast) recommendation list

getScoresMap

public abstract it.unimi.dsi.fastutil.ints.Int2DoubleMap getScoresMap(int uidx)

Returns a map of item-score pairs.

Parameters:

uidx - index of the user whose scores are predicted

Returns:

a map of item-score pairs