org.grouplens.lenskit.predict

Class KnownRatingRatingPredictor

java.lang.Object

org.grouplens.lenskit.basic.AbstractRatingPredictor

org.grouplens.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(UserEventDAO uedao)

Method Summary

Modifier and Type	Method and Description
void	predict(long user, MutableSparseVector predictions) Predict for items in a vector.

Methods inherited from class org.grouplens.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(UserEventDAO uedao)

Method Detail

predict

public void predict(long user,
                    @Nonnull
                    MutableSparseVector predictions)

Description copied from interface: RatingPredictor

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

Parameters:

user - The user ID.

predictions - The prediction output vector. Its key domain is the items to score.