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

Class AbstractFactorizer

java.lang.Object

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

All Implemented Interfaces:

Refreshable, Factorizer

Direct Known Subclasses:

ALSWRFactorizer, ParallelSGDFactorizer, RatingSGDFactorizer

public abstract class AbstractFactorizer
extends Object
implements Factorizer

base class for Factorizers, provides ID to index mapping

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractFactorizer(DataModel dataModel)

Method Summary

Modifier and Type	Method and Description
protected Factorization	createFactorization(double[][] userFeatures, double[][] itemFeatures)
protected Integer	itemIndex(long itemID)
void	refresh(Collection<Refreshable> alreadyRefreshed) Triggers "refresh" -- whatever that means -- of the implementation.
protected Integer	userIndex(long userID)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer

factorize

Constructor Detail

AbstractFactorizer

protected AbstractFactorizer(DataModel dataModel)
                      throws TasteException

Throws:

TasteException

Method Detail

createFactorization

protected Factorization createFactorization(double[][] userFeatures,
                                            double[][] itemFeatures)

userIndex

protected Integer userIndex(long userID)

itemIndex

protected Integer itemIndex(long itemID)

refresh

public void refresh(Collection<Refreshable> alreadyRefreshed)

Description copied from interface: Refreshable

Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any Refreshable should always leave itself in a consistent, operational state, and that the refresh atomically updates internal state from old to new.

Specified by:

refresh in interface Refreshable

Parameters:

alreadyRefreshed - Refreshables that are known to have already been refreshed as a result of an initial call to a {#refresh(Collection)} method on some object. This ensure that objects in a refresh dependency graph aren't refreshed twice needlessly.