org.lenskit.transform.normalize

Class AbstractItemVectorNormalizer

java.lang.Object

org.lenskit.transform.normalize.AbstractItemVectorNormalizer

All Implemented Interfaces:

ItemVectorNormalizer

Direct Known Subclasses:

BiasItemVectorNormalizer

public abstract class AbstractItemVectorNormalizer
extends Object
implements ItemVectorNormalizer

Abstract item vector normalizer implementation.

Constructor Summary

Constructors

Constructor and Description
AbstractItemVectorNormalizer()

Method Summary

Modifier and Type	Method and Description
MutableSparseVector	normalize(long item, SparseVector vector, MutableSparseVector target) Normalize a vector with respect to an item vector.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.lenskit.transform.normalize.ItemVectorNormalizer

makeTransformation, makeTransformation

Constructor Detail

AbstractItemVectorNormalizer

public AbstractItemVectorNormalizer()

Method Detail

normalize

public MutableSparseVector normalize(long item,
                                     @Nonnull
                                     SparseVector vector,
                                     @Nullable
                                     MutableSparseVector target)

Normalize a vector with respect to an item vector.

Delegates to ItemVectorNormalizer.makeTransformation(long, SparseVector) and the resulting VectorTransformation.

Specified by:

normalize in interface ItemVectorNormalizer

Parameters:

item - The item id to normalize a vector for.

vector - The item’s vector for reference.

target - The vector to normalize. If null, the item vector is normalized.

Returns:

The target vector, if specified. Otherwise, a fresh mutable vector containing a normalized copy of the item vector is returned.