org.lenskit.mf.svd

Class BiasedMFItemScorer

java.lang.Object

org.lenskit.basic.AbstractItemScorer

org.lenskit.mf.svd.BiasedMFItemScorer

All Implemented Interfaces:

org.lenskit.api.ItemScorer

Direct Known Subclasses:

FunkSVDItemScorer

public class BiasedMFItemScorer
extends org.lenskit.basic.AbstractItemScorer

Item scorer using biased matrix factorization. This implements SVD-style item scorers.

Since:

2.1

Constructor Summary

Constructors

Constructor and Description
BiasedMFItemScorer(MFModel mod, BiasedMFKernel kern, org.lenskit.api.ItemScorer bl) Create a new biased MF item scorer.

Method Summary

Modifier and Type	Method and Description
MFModel	getModel()
protected org.apache.commons.math3.linear.RealVector	getUserPreferenceVector(long user) Get a user’s preference vector.
org.lenskit.api.ResultMap	scoreWithDetails(long user, Collection<Long> items)

Methods inherited from class org.lenskit.basic.AbstractItemScorer

score, score

Methods inherited from class java.lang.Object

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

Constructor Detail

BiasedMFItemScorer

@Inject
public BiasedMFItemScorer(MFModel mod,
                                   BiasedMFKernel kern,
                                   @BaselineScorer
                                   org.lenskit.api.ItemScorer bl)

Create a new biased MF item scorer.

Parameters:

mod - The model (factorized matrix)

kern - The kernel function to compute scores.

bl - The baseline scorer (used to compute biases).

Method Detail

getUserPreferenceVector

@Nullable
protected org.apache.commons.math3.linear.RealVector getUserPreferenceVector(long user)

Get a user’s preference vector.

Parameters:

user - The user ID.

Returns:

The user’s preference vector, or null if no preferences are available for the user.

getModel

public MFModel getModel()

scoreWithDetails

@Nonnull
public org.lenskit.api.ResultMap scoreWithDetails(long user,
                                                            @Nonnull
                                                            Collection<Long> items)