de.jungblut.math.minimize

Class NegatedCostFunction

java.lang.Object

de.jungblut.math.minimize.NegatedCostFunction

All Implemented Interfaces:

CostFunction

public final class NegatedCostFunction
extends Object
implements CostFunction

Negated cost function to implement maximization problems. It simply negates the gradient input and the cost, so this change is transparent to the minimizer that is calling this function.

Author:

thomas.jungblut

Constructor Summary

Constructors

Constructor and Description
NegatedCostFunction(CostFunction minableCostFunction)

Method Summary

Modifier and Type	Method and Description
CostGradientTuple	evaluateCost(de.jungblut.math.DoubleVector input) Evaluation for the cost function to retrieve cost and gradient.

Methods inherited from class java.lang.Object

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

Constructor Detail

NegatedCostFunction

public NegatedCostFunction(CostFunction minableCostFunction)

Method Detail

evaluateCost

public CostGradientTuple evaluateCost(de.jungblut.math.DoubleVector input)

Description copied from interface: CostFunction

Evaluation for the cost function to retrieve cost and gradient.

Specified by:

evaluateCost in interface CostFunction

Parameters:

input - a given input vector

Returns:

a tuple consists of J (cost) and a vector X which is the gradient of the input.