de.jungblut.math.minimize

Interface CostFunction

All Known Implementing Classes:

AbstractMiniBatchCostFunction, ConditionalLikelihoodCostFunction, LogisticRegressionCostFunction, MultilayerPerceptronCostFunction, NegatedCostFunction, RBMCostFunction

public interface CostFunction

Cost function interface to be implemented when using with a optimizer like conjugate gradient for example.

Author:

thomas.jungblut

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.

Method Detail

evaluateCost

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

Evaluation for the cost function to retrieve cost and gradient.

Parameters:

input - a given input vector

Returns:

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