org.tribuo.math.util

Class SigmoidNormalizer

java.lang.Object

org.tribuo.math.util.SigmoidNormalizer

All Implemented Interfaces:

Serializable, VectorNormalizer

public class SigmoidNormalizer
extends Object
implements VectorNormalizer, Serializable

Normalizes the input by applying a logistic sigmoid to each element. Used when the input is independent dimensions of log space.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SigmoidNormalizer()

Method Summary

Modifier and Type	Method and Description
double[]	normalize(double[] input) Normalizes the input array in some fashion specified by the class.
void	normalizeInPlace(double[] input) In place normalization of the array.
static double	sigmoid(double input) A logistic sigmoid function.

Methods inherited from class java.lang.Object

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

Constructor Detail

SigmoidNormalizer

public SigmoidNormalizer()

Method Detail

sigmoid

public static double sigmoid(double input)

A logistic sigmoid function.

Parameters:

input - The input to sigmoid.

Returns:

The logistic function applied to the input.

normalize

public double[] normalize(double[] input)

Description copied from interface: VectorNormalizer

Normalizes the input array in some fashion specified by the class.

Specified by:

normalize in interface VectorNormalizer

Parameters:

input - The input to normalize.

Returns:

The normalized array.

normalizeInPlace

public void normalizeInPlace(double[] input)

Description copied from interface: VectorNormalizer

In place normalization of the array.

Note: This default implementation performs a copy by calling the standard normalize method.

Specified by:

normalizeInPlace in interface VectorNormalizer

Parameters:

input - The input to normalize.