org.lenskit.predict

Class KnownRatingRatingPredictor

java.lang.Object

org.lenskit.basic.AbstractRatingPredictor

org.lenskit.predict.KnownRatingRatingPredictor

All Implemented Interfaces:

RatingPredictor

public class KnownRatingRatingPredictor
extends AbstractRatingPredictor

Use a user’s existing ratings as predictions. This rating predictor returns the user’s rating as a prediction for all items the user has rated, and returns no prediction for items the user has rated. It is useful in conjunction with a FallbackItemScorer to return a user’s rating when it is known.

Since:

2.2

See Also:

RatingPredictorItemScorer

Constructor Summary

Constructors

Constructor and Description
KnownRatingRatingPredictor(DataAccessObject d)

Method Summary

Modifier and Type	Method and Description
ResultMap	predictWithDetails(long user, java.util.Collection<java.lang.Long> items) Predict the user’s preference for a collection of items, potentially with additional details.

Methods inherited from class org.lenskit.basic.AbstractRatingPredictor

predict, predict

Methods inherited from class java.lang.Object

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

Constructor Detail

KnownRatingRatingPredictor

@Inject
public KnownRatingRatingPredictor(DataAccessObject d)

Method Detail

predictWithDetails

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

Description copied from interface: RatingPredictor

Predict the user’s preference for a collection of items, potentially with additional details.

Parameters:

user - The user ID for whom to generate predicts.

items - The items to predict for.

Returns:

A mapping from item IDs to predicted preference. This mapping may not contain all requested items.