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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2013/04/07 11:21:20 UTC
[jira] [Closed] (MATH-949) LevenbergMarquardtOptimizer reports 0
iterations
[ https://issues.apache.org/jira/browse/MATH-949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe closed MATH-949.
------------------------------
Closing issue as version 3.2 has been released on 2013-04-06.
> LevenbergMarquardtOptimizer reports 0 iterations
> ------------------------------------------------
>
> Key: MATH-949
> URL: https://issues.apache.org/jira/browse/MATH-949
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.2
> Reporter: Evan Ward
> Fix For: 3.2
>
>
> The method LevenbergMarquardtOptimizer.getIterations() does not report the correct number of iterations; It always returns 0. A quick look at the code shows that only SimplexOptimizer calls BaseOptimizer.incrementEvaluationsCount()
> I've put a test case below. Notice how the evaluations count is correctly incremented, but the iterations count is not.
> {noformat}
> @Test
> public void testGetIterations() {
> // setup
> LevenbergMarquardtOptimizer otim = new LevenbergMarquardtOptimizer();
> // action
> otim.optimize(new MaxEval(100), new Target(new double[] { 1 }),
> new Weight(new double[] { 1 }), new InitialGuess(
> new double[] { 3 }), new ModelFunction(
> new MultivariateVectorFunction() {
> @Override
> public double[] value(double[] point)
> throws IllegalArgumentException {
> return new double[] { FastMath.pow(point[0], 4) };
> }
> }), new ModelFunctionJacobian(
> new MultivariateMatrixFunction() {
> @Override
> public double[][] value(double[] point)
> throws IllegalArgumentException {
> return new double[][] { { 0.25 * FastMath.pow(
> point[0], 3) } };
> }
> }));
> // verify
> assertThat(otim.getEvaluations(), greaterThan(1));
> assertThat(otim.getIterations(), greaterThan(1));
> }
> {noformat}
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