org.lenskit.transform.normalize

Class BiasUserVectorNormalizer

java.lang.Object

org.lenskit.transform.normalize.AbstractUserVectorNormalizer

org.lenskit.transform.normalize.BiasUserVectorNormalizer

All Implemented Interfaces:

UserVectorNormalizer

public class BiasUserVectorNormalizer
extends AbstractUserVectorNormalizer

User vector normalizer that subtracts user-item biases.

Constructor Summary

Constructors

Constructor and Description
BiasUserVectorNormalizer(BiasModel bias) Construct a new normalizer.

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 userId, SparseVector vector) Make a vector transformation for a user.

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

normalize

Methods inherited from class java.lang.Object

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

Constructor Detail

BiasUserVectorNormalizer

@Inject
public BiasUserVectorNormalizer(BiasModel bias)

Construct a new normalizer.

Parameters:

bias - The bias model to subtract from user vector values.

Method Detail

makeTransformation

public VectorTransformation makeTransformation(long userId,
                                               SparseVector 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:

userId - 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.

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.