java.lang.Object

es.uam.eps.ir.ranksys.rec.AbstractRecommender<U,I>

es.uam.eps.ir.relison.links.recommendation.updateable.fast.AbstractFastUpdateableRecommender<U,I>

es.uam.eps.ir.relison.links.recommendation.updateable.mf.MFUpdateableRecommender<U,I>

Type Parameters:: U - type of the users; I - type of the items

All Implemented Interfaces:: es.uam.eps.ir.ranksys.core.index.ItemIndex<I>, es.uam.eps.ir.ranksys.core.index.UserIndex<U>, es.uam.eps.ir.ranksys.fast.index.FastItemIndex<I>, es.uam.eps.ir.ranksys.fast.index.FastUserIndex<U>, es.uam.eps.ir.ranksys.rec.fast.FastRecommender<U,I>, es.uam.eps.ir.ranksys.rec.Recommender<U,I>, FastUpdateableRecommender<U,I>, UpdateableRecommender<U,I>

public class MFUpdateableRecommender<U,I>
extends AbstractFastUpdateableRecommender<U,I>

Matrix factorization recommender. Scores are calculated as the inner product of user and item vectors. The recommendation algorithm can be updated over time.

Field Summary

Fields
Modifier and Type	Field	Description
`private UpdateableFactorization<U,I>`	`factorization`	The current matrix factorization.
`private UpdateableFactorizer<U,I>`	`factorizer`	The factorizer.

Fields inherited from class es.uam.eps.ir.relison.links.recommendation.updateable.fast.AbstractFastUpdateableRecommender

prefData

Constructor Summary

Constructors
Constructor	Description
`MFUpdateableRecommender(FastUpdateablePreferenceData<U,I> dataPref, UpdateableFactorization<U,I> factorization, UpdateableFactorizer<U,I> factorizer)`	Constructor.

Method Summary

Modifier and Type	Method	Description
`es.uam.eps.ir.ranksys.fast.FastRecommendation`	`getRecommendation(int uidx, int maxLength, java.util.function.IntPredicate filter)`
`es.uam.eps.ir.ranksys.fast.FastRecommendation`	`getRecommendation(int uidx, java.util.stream.IntStream candidates)`
`void`	`update(java.util.stream.Stream<org.jooq.lambda.tuple.Tuple3<U,I,java.lang.Double>> tuples)`	Updates the values of the recommender, considering that the following preferences have been added.
`void`	`update(U u, I i, double val)`	Updates the values of the recommender, considering that a new rating has been added.
`void`	`updateAddItem(I i)`	Updates the values of the recommender, considering that a new item has been added.
`void`	`updateAddUser(U u)`	Updates the values of the recommender, considering that a new user has been added.
`void`	`updateDelete(java.util.stream.Stream<org.jooq.lambda.tuple.Tuple3<U,I,java.lang.Double>> tuples)`	Updates the values of the recommender, considering that the following preferences have been removed.
`void`	`updateDelete(U u, I i, double val)`	Updates the values of the recommender, considering that a rating has been deleted.

Methods inherited from class es.uam.eps.ir.relison.links.recommendation.updateable.fast.AbstractFastUpdateableRecommender

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.fast.index.FastItemIndex

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

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.rec.Recommender

getRecommendation, getRecommendation

Field Details
- factorization
  
  private final UpdateableFactorization<U,I> factorization
  
  The current matrix factorization.
- factorizer
  
  private final UpdateableFactorizer<U,I> factorizer
  
  The factorizer.
Constructor Details
- MFUpdateableRecommender
  
  public MFUpdateableRecommender(FastUpdateablePreferenceData<U,I> dataPref, UpdateableFactorization<U,I> factorization, UpdateableFactorizer<U,I> factorizer)
  
  Constructor.
  
  Parameters:
  
  dataPref - preferences
  
  factorization - matrix factorization
  
  factorizer - the factorizer.
Method Details
- getRecommendation
  
  public es.uam.eps.ir.ranksys.fast.FastRecommendation getRecommendation(int uidx, int maxLength, java.util.function.IntPredicate filter)
  
  Specified by:
  
  getRecommendation in interface es.uam.eps.ir.ranksys.rec.fast.FastRecommender<U,I>
  
  Specified by:
  
  getRecommendation in class AbstractFastUpdateableRecommender<U,I>
- getRecommendation
  
  public es.uam.eps.ir.ranksys.fast.FastRecommendation getRecommendation(int uidx, java.util.stream.IntStream candidates)
  
  Specified by:
  
  getRecommendation in interface es.uam.eps.ir.ranksys.rec.fast.FastRecommender<U,I>
  
  Overrides:
  
  getRecommendation in class AbstractFastUpdateableRecommender<U,I>
- updateAddUser
  
  public void updateAddUser(U u)
  
  Description copied from interface: UpdateableRecommender
  
  Updates the values of the recommender, considering that a new user has been added.
  
  Parameters:
  
  u - the user which has been added.
- updateAddItem
  
  public void updateAddItem(I i)
  
  Description copied from interface: UpdateableRecommender
  
  Updates the values of the recommender, considering that a new item has been added.
  
  Parameters:
  
  i - the item which has been added.
- update
  
  public void update(java.util.stream.Stream<org.jooq.lambda.tuple.Tuple3<U,I,java.lang.Double>> tuples)
  
  Description copied from interface: UpdateableRecommender
  
  Updates the values of the recommender, considering that the following preferences have been added.
  
  Parameters:
  
  tuples - the preferences which have been added.
- update
  
  public void update(U u, I i, double val)
  
  Description copied from interface: UpdateableRecommender
  
  Updates the values of the recommender, considering that a new rating has been added.
  
  Parameters:
  
  u - the user.
  
  i - the item
  
  val - the value.
- updateDelete
  
  public void updateDelete(java.util.stream.Stream<org.jooq.lambda.tuple.Tuple3<U,I,java.lang.Double>> tuples)
  
  Description copied from interface: UpdateableRecommender
  
  Updates the values of the recommender, considering that the following preferences have been removed.
  
  Parameters:
  
  tuples - the preferences which have been removed.
- updateDelete
  
  public void updateDelete(U u, I i, double val)
  
  Description copied from interface: UpdateableRecommender
  
  Updates the values of the recommender, considering that a rating has been deleted.
  
  Parameters:
  
  u - the user.
  
  i - the item.
  
  val - the value.

Class MFUpdateableRecommender<U,​I>