org.lenskit.transform.normalize

Class DefaultItemVectorNormalizer

java.lang.Object

org.lenskit.transform.normalize.DefaultItemVectorNormalizer

All Implemented Interfaces:

java.io.Serializable, ItemVectorNormalizer

@Shareable
public class DefaultItemVectorNormalizer
extends java.lang.Object
implements ItemVectorNormalizer, java.io.Serializable

Default item vector normalizer that delegates to a generic VectorNormalizer.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected VectorNormalizer	delegate

Constructor Summary

Constructors

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

Method Summary

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

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

DefaultItemVectorNormalizer

public DefaultItemVectorNormalizer()

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

DefaultItemVectorNormalizer

@Inject
public DefaultItemVectorNormalizer(VectorNormalizer norm)

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

Parameters:

norm - The generic normalizer to use.

Method Detail

makeTransformation

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

Description copied from interface: ItemVectorNormalizer

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

Specified by:

makeTransformation in interface ItemVectorNormalizer

Parameters:

itemId - The item ID to normalize for.

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

Returns:

The vector transformation normalizing for this item.

getVectorNormalizer

public VectorNormalizer getVectorNormalizer()

Get the underlying vector normalizer.

Returns:

The underlying vector normalizer.