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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2011/03/23 21:25:06 UTC
[jira] [Closed] (MATH-427) LevenbergMarquardtOptimizer: able to
customize convergence condition
[ https://issues.apache.org/jira/browse/MATH-427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe closed MATH-427.
------------------------------
Closing duplicate issue
> LevenbergMarquardtOptimizer: able to customize convergence condition
> --------------------------------------------------------------------
>
> Key: MATH-427
> URL: https://issues.apache.org/jira/browse/MATH-427
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Christiaan
>
> Currently it is not possible to customize the condition for exiting the iterations in the doOptimize() of LevenbergMarquardtOptimizer. I ran into the scenario where the following condition was already met after 2 iterations, however in this scenario a better result could be achieved after 118 iterations:
> Current condition:
> // tests for convergence.
> if (((Math.abs(actRed) <= costRelativeTolerance) &&
> (preRed <= costRelativeTolerance) &&
> (ratio <= 2.0)) ||
> (delta <= parRelativeTolerance * xNorm)) {
> return new VectorialPointValuePair(point, objective);
> }
> Preferred condition:
> delta <= 2.2204e-16 * xNorm
> Eg. code should probably invoke VectorialConvergenceChecker in AbstractLeastSquaresOptimizer
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