org.grouplens.lenskit.basic

Class PrecomputedItemScorer

java.lang.Object

org.grouplens.lenskit.basic.AbstractItemScorer

org.grouplens.lenskit.basic.PrecomputedItemScorer

All Implemented Interfaces:

Serializable, ItemScorer

public class PrecomputedItemScorer
extends AbstractItemScorer
implements Serializable

An item scorer that stores a precomputed map of item scores.

Since:

2.1

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PrecomputedItemScorer.Builder Builder for mock item scorers.

Method Summary

Modifier and Type	Method and Description
static PrecomputedItemScorer.Builder	newBuilder() Construct a new builder for precomputed item scorers.
void	score(long user, MutableSparseVector scores) Score items in a vector.

Methods inherited from class org.grouplens.lenskit.basic.AbstractItemScorer

score, score

Methods inherited from class java.lang.Object

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

Method Detail

score

public void score(long user,
                  @Nonnull
                  MutableSparseVector scores)

Description copied from interface: ItemScorer

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

Specified by:

score in interface ItemScorer

Parameters:

user - The user ID.

scores - The score vector.

newBuilder

public static PrecomputedItemScorer.Builder newBuilder()

Construct a new builder for precomputed item scorers. This is useful for building item scorers for mocks.

Returns:

A new builder for item scorers.