org.lenskit.basic

Class AbstractRatingPredictor

java.lang.Object

org.lenskit.basic.AbstractRatingPredictor

All Implemented Interfaces:

RatingPredictor

Direct Known Subclasses:

KnownRatingRatingPredictor, OrdRecRatingPredictor, QuantizedRatingPredictor

public abstract class AbstractRatingPredictor
extends java.lang.Object
implements RatingPredictor

Base class to make item scorers easier to implement. Delegates all score methods to RatingPredictor.predictWithDetails(long, Collection).

Since:

3.0

Constructor Summary

Constructors

Constructor and Description
AbstractRatingPredictor()

Method Summary

Modifier and Type	Method and Description
java.util.Map<java.lang.Long,java.lang.Double>	predict(long user, java.util.Collection<java.lang.Long> items) Predict the user’s preference for a collection of items.
Result	predict(long user, long item) Predict a user’s rating for a single item.

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.RatingPredictor

predictWithDetails

Constructor Detail

AbstractRatingPredictor

public AbstractRatingPredictor()

Method Detail

predict

public Result predict(long user,
                      long item)

Predict a user’s rating for a single item.

This implementation delegates to RatingPredictor.predictWithDetails(long, Collection).

Specified by:

predict in interface RatingPredictor

Parameters:

user - The user ID for whom to generate a prediction.

item - The item ID whose rating is to be predicted.

Returns:

The predicted preference, or Double.NaN if no preference can be predicted.

predict

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

Predict the user’s preference for a collection of items.

This implementation delegates to RatingPredictor.predictWithDetails(long, Collection).

Specified by:

predict in interface RatingPredictor

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.