org.lenskit.basic

Class PopularityRankItemScorer

java.lang.Object

org.lenskit.basic.AbstractItemScorer

org.lenskit.basic.PopularityRankItemScorer

All Implemented Interfaces:

java.io.Serializable, ItemScorer

@Shareable
public class PopularityRankItemScorer
extends AbstractItemScorer
implements java.io.Serializable

Item scorer scores items based on their popularity rank. 1 is the most popular item, and 0 is an unknown item.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PopularityRankItemScorer(InteractionStatistics stats)

Method Summary

Modifier and Type	Method and Description
java.util.Map<java.lang.Long,java.lang.Double>	score(long user, java.util.Collection<java.lang.Long> items) Score a collection of items.
ResultMap	scoreWithDetails(long user, java.util.Collection<java.lang.Long> items) Score a collection of items and potentially return more details on the scores.

Methods inherited from class org.lenskit.basic.AbstractItemScorer

score

Methods inherited from class java.lang.Object

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

Constructor Detail

PopularityRankItemScorer

@Inject
public PopularityRankItemScorer(InteractionStatistics stats)

Method Detail

score

@Nonnull
public java.util.Map<java.lang.Long,java.lang.Double> score(long user,
                                                                     @Nonnull
                                                                     java.util.Collection<java.lang.Long> items)

Description copied from class: AbstractItemScorer

Score a collection of items.

This implementation delegates to ItemScorer.scoreWithDetails(long, Collection).

Specified by:

score in interface ItemScorer

Overrides:

score in class AbstractItemScorer

Parameters:

user - The user ID for whom to generate scores.

items - The item to score.

Returns:

The scores for the items. This result set may not contain all requested items.

scoreWithDetails

@Nonnull
public ResultMap scoreWithDetails(long user,
                                           @Nonnull
                                           java.util.Collection<java.lang.Long> items)

Description copied from interface: ItemScorer

Score a collection of items and potentially return more details on the scores.

Specified by:

scoreWithDetails in interface ItemScorer

Parameters:

user - The user ID for whom to generate scores.

items - The item to score.

Returns:

The scores for the items. This result set may not contain all requested items. Implementations that support additional details will return a subclass of ResultMap that provides access to those details.