org.lenskit.transform.normalize

Class DefaultUserVectorNormalizer

java.lang.Object

org.lenskit.transform.normalize.DefaultUserVectorNormalizer

All Implemented Interfaces:

java.io.Serializable, UserVectorNormalizer

@Shareable
public class DefaultUserVectorNormalizer
extends java.lang.Object
implements UserVectorNormalizer, java.io.Serializable

Default user vector normalizer that delegates to a generic VectorNormalizer.

Since:

0.11

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected VectorNormalizer	delegate

Constructor Summary

Constructors

Constructor and Description
DefaultUserVectorNormalizer() Construct a new user vector normalizer that uses the identity normalization.
DefaultUserVectorNormalizer(VectorNormalizer norm) Construct a new user vector normalizer wrapping a generic vector normalizer.

Method Summary

Modifier and Type	Method and Description
VectorNormalizer	getVectorNormalizer() Get the delegate vector normalizer.
InvertibleFunction<Long2DoubleMap,Long2DoubleMap>	makeTransformation(long user, Long2DoubleMap vector) Make a vector transformation for a user.

Methods inherited from class java.lang.Object

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

Field Detail

delegate

protected final VectorNormalizer delegate

Constructor Detail

DefaultUserVectorNormalizer

public DefaultUserVectorNormalizer()

Construct a new user vector normalizer that uses the identity normalization.

DefaultUserVectorNormalizer

@Inject
public DefaultUserVectorNormalizer(VectorNormalizer norm)

Construct a new user vector normalizer wrapping a generic vector normalizer.

Parameters:

norm - The generic normalizer to use.

Method Detail

getVectorNormalizer

public VectorNormalizer getVectorNormalizer()

Get the delegate vector normalizer.

Returns:

The vector normalizer used by this UVN.

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.

Specified by:

makeTransformation in interface UserVectorNormalizer

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.