org.lenskit.transform.normalize

Class BaselineSubtractingUserVectorNormalizer

java.lang.Object

org.lenskit.transform.normalize.AbstractUserVectorNormalizer

org.lenskit.transform.normalize.BaselineSubtractingUserVectorNormalizer

All Implemented Interfaces:

UserVectorNormalizer

public class BaselineSubtractingUserVectorNormalizer
extends AbstractUserVectorNormalizer

User vector normalizer that subtracts a user’s baseline scores.

Field Summary

Fields

Modifier and Type	Field and Description
protected ItemScorer	baselineScorer

Constructor Summary

Constructors

Constructor and Description
BaselineSubtractingUserVectorNormalizer(ItemScorer baseline) Create a new baseline-subtracting normalizer with the given baseline.

Method Summary

Modifier and Type	Method and Description
InvertibleFunction<Long2DoubleMap,Long2DoubleMap>	makeTransformation(long user, Long2DoubleMap vector) Make a vector transformation for a user.
VectorTransformation	makeTransformation(long user, SparseVector ratings) Make a vector transformation for a user.
String	toString()

Methods inherited from class org.lenskit.transform.normalize.AbstractUserVectorNormalizer

normalize

Methods inherited from class java.lang.Object

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

Field Detail

baselineScorer

protected final ItemScorer baselineScorer

Constructor Detail

BaselineSubtractingUserVectorNormalizer

@Inject
public BaselineSubtractingUserVectorNormalizer(@BaselineScorer
                                                        ItemScorer baseline)

Create a new baseline-subtracting normalizer with the given baseline.

Parameters:

baseline - The baseline scorer to use for normalization.

Method Detail

makeTransformation

public VectorTransformation makeTransformation(long user,
                                               SparseVector ratings)

Description copied from interface: UserVectorNormalizer

Make a vector transformation for a user. The resulting transformation will be applied to user vectors to normalize and denormalize them.

Parameters:

user - The user ID to normalize for.

ratings - The user’s vector to use as the reference vector.

Returns:

The vector transformation normalizing for this user.

makeTransformation

public InvertibleFunction<Long2DoubleMap,Long2DoubleMap> makeTransformation(long user,
                                                                            Long2DoubleMap vector)

Description copied from interface: UserVectorNormalizer

Make a vector transformation for a user. The resulting transformation will be applied to user vectors to normalize and denormalize them.

Parameters:

user - The user ID to normalize for.

vector - The user’s vector to use as the reference vector.

Returns:

The vector transformation normalizing for this user.

toString

public String toString()

Overrides:

toString in class Object