org.grouplens.lenskit.slopeone

Class SlopeOneItemScorer

java.lang.Object

org.grouplens.lenskit.basic.AbstractItemScorer

org.grouplens.lenskit.slopeone.SlopeOneItemScorer

All Implemented Interfaces:

ItemScorer

Direct Known Subclasses:

WeightedSlopeOneItemScorer

public class SlopeOneItemScorer
extends AbstractItemScorer

An ItemScorer that implements the Slope One algorithm.

Field Summary

Fields

Modifier and Type	Field and Description
protected UserEventDAO	dao
protected PreferenceDomain	domain
protected SlopeOneModel	model

Constructor Summary

Constructors

Constructor and Description
SlopeOneItemScorer(UserEventDAO dao, SlopeOneModel model, PreferenceDomain dom)

Method Summary

Modifier and Type	Method and Description
SlopeOneModel	getModel()
void	score(long uid, MutableSparseVector scores) Score items in a vector.

Methods inherited from class org.grouplens.lenskit.basic.AbstractItemScorer

score, score

Methods inherited from class java.lang.Object

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

Field Detail

dao

protected final UserEventDAO dao

model

protected SlopeOneModel model

domain

protected final PreferenceDomain domain

Constructor Detail

SlopeOneItemScorer

@Inject
public SlopeOneItemScorer(UserEventDAO dao,
                                  SlopeOneModel model,
                                  @Nullable
                                  PreferenceDomain dom)

Method Detail

score

public void score(long uid,
                  @Nonnull
                  MutableSparseVector scores)

Description copied from interface: ItemScorer

Score items in a vector. The key domain of the provided vector is the items to score, and the score method sets the values for each item to its score (or unsets it, if no score can be provided). The previous values are discarded.

Parameters:

uid - The user ID.

scores - The score vector.

getModel

public SlopeOneModel getModel()