org.lenskit.basic

Class AbstractItemBasedItemScorer

java.lang.Object

org.lenskit.basic.AbstractItemBasedItemScorer

All Implemented Interfaces:

ItemBasedItemScorer

Direct Known Subclasses:

ItemItemItemBasedItemScorer

public abstract class AbstractItemBasedItemScorer
extends java.lang.Object
implements ItemBasedItemScorer

Base class to make it easier to implement ItemBasedItemScorer. All methods delegate to ItemBasedItemScorer.scoreRelatedItemsWithDetails(Collection, Collection).

Constructor Summary

Constructors

Constructor and Description
AbstractItemBasedItemScorer()

Method Summary

Modifier and Type	Method and Description
Result	scoreRelatedItem(java.util.Collection<java.lang.Long> basket, long item) Score a single item based on a collection of items (e.g.
java.util.Map<java.lang.Long,java.lang.Double>	scoreRelatedItems(java.util.Collection<java.lang.Long> basket, java.util.Collection<java.lang.Long> items) Score a collection of items based on a collection of items (e.g.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.lenskit.api.ItemBasedItemScorer

scoreRelatedItemsWithDetails

Constructor Detail

AbstractItemBasedItemScorer

public AbstractItemBasedItemScorer()

Method Detail

scoreRelatedItems

@Nonnull
public java.util.Map<java.lang.Long,java.lang.Double> scoreRelatedItems(@Nonnull
                                                                                 java.util.Collection<java.lang.Long> basket,
                                                                                 @Nonnull
                                                                                 java.util.Collection<java.lang.Long> items)

Score a collection of items based on a collection of items (e.g. a shopping basket).

This implementation delegates to ItemBasedItemScorer.scoreRelatedItemsWithDetails(Collection, Collection).

Specified by:

scoreRelatedItems in interface ItemBasedItemScorer

Parameters:

basket - The objective items ID used as the query

items - The list of items to score.

Returns:

A mapping from item IDs to relevance scores. This mapping may not contain all requested items.

scoreRelatedItem

public Result scoreRelatedItem(@Nonnull
                               java.util.Collection<java.lang.Long> basket,
                               long item)

Score a single item based on a collection of items (e.g. a shopping basket).

This implementation delegates to ItemBasedItemScorer.scoreRelatedItemsWithDetails(Collection, Collection).

Specified by:

scoreRelatedItem in interface ItemBasedItemScorer

Parameters:

basket - The objective items ID used as the query

item - The item ID to score.

Returns:

The relevance score, or null if no score can be predicted.