org.lenskit.transform.normalize

Interface VectorTransformation

All Superinterfaces:

Function<Long2DoubleMap,Long2DoubleMap>, InvertibleFunction<Long2DoubleMap,Long2DoubleMap>

public interface VectorTransformation
extends InvertibleFunction<Long2DoubleMap,Long2DoubleMap>

Reversible in-place vector transformations.

Method Summary

Modifier and Type	Method and Description
double	apply(long key, double value) Apply the transformation to an individual value.
MutableSparseVector	apply(MutableSparseVector vector) Apply the vector transformation in-place to a vector.
double	unapply(long key, double value) Apply the inverse of the transformation to an individual value.
MutableSparseVector	unapply(MutableSparseVector vector) Unapply the vector transformation in-place on a transformed vector.

Methods inherited from interface org.lenskit.util.InvertibleFunction

unapply

Methods inherited from interface com.google.common.base.Function

apply, equals

Method Detail

apply

MutableSparseVector apply(MutableSparseVector vector)

Apply the vector transformation in-place to a vector.

Parameters:

vector - The vector to transform.

Returns:

vector (for chaining).

unapply

MutableSparseVector unapply(MutableSparseVector vector)

Unapply the vector transformation in-place on a transformed vector. In some cases, the unapplication may supply values for key domain members that do not have values.

Parameters:

vector - The vector to transform.

Returns:

vector (for chaining).

apply

double apply(long key,
             double value)

Apply the transformation to an individual value.

Parameters:

value - The value.

Returns:

The transformed values.

unapply

double unapply(long key,
               double value)

Apply the inverse of the transformation to an individual value.

Parameters:

value - The value.

Returns:

The untransformed value.