Details
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Bug
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Status: Closed
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Major
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Resolution: Fixed
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3.2
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None
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None
Description
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.
@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));
}