Package org.ddogleg.optimization.loss

Class LossIRLS

java.lang.Object

org.ddogleg.optimization.loss.LossWeighted

org.ddogleg.optimization.loss.LossIRLS

All Implemented Interfaces:

FunctionNtoN, FunctionNtoS, LossFunction, LossFunctionGradient

public class LossIRLS
extends LossWeighted

Iteratively Reweighted Least-Squares (IRLS) allows the weights to be recomputed every iteration. At the start of an internation the weights are computed and saved. This is to ensure the cost function doesn't change as the solver is trying to optimise and it needs to back step.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	LossIRLS.ComputeWeights

Field Summary

Fields

Modifier and Type	Field	Description
LossIRLS.ComputeWeights	computeOp	Function that's called when the weights need to be updated.

Fields inherited from class org.ddogleg.optimization.loss.LossWeighted

weights

Constructor Summary

Constructors

Constructor	Description
LossIRLS()

Method Summary

Modifier and Type	Method	Description
boolean	fixate(double[] residuals)	Passes in the current residuals at the start of an iteration.
void	setNumberOfFunctions(int value)

Methods inherited from class org.ddogleg.optimization.loss.LossWeighted

getNumberOfFunctions, process, process

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ddogleg.optimization.loss.LossFunction

getNumOfInputsN

Methods inherited from interface org.ddogleg.optimization.loss.LossFunctionGradient

getN

Field Details

computeOp

public LossIRLS.ComputeWeights computeOp

Function that's called when the weights need to be updated. Must be specified.

Constructor Details

LossIRLS

public LossIRLS()

Method Details

fixate

public boolean fixate(double[] residuals)

Description copied from interface: LossFunction

Passes in the current residuals at the start of an iteration. If a loss function is dynamically computed and conditional on the residuals, here's where it should be done

Returns:

true if the loss function has changed and the cost needs to be recomputed.

setNumberOfFunctions

public void setNumberOfFunctions(int value)

Specified by:

setNumberOfFunctions in interface LossFunction

Specified by:

setNumberOfFunctions in interface LossFunctionGradient

Overrides:

setNumberOfFunctions in class LossWeighted