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Posted to issues@commons.apache.org by "Luke Lindsay (JIRA)" <ji...@apache.org> on 2015/12/01 16:57:10 UTC

[jira] [Created] (MATH-1295) NonLinearConjugateGradientOptimizer and BracketFinder TooManyEvaluationsException

Luke Lindsay created MATH-1295:
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             Summary: NonLinearConjugateGradientOptimizer and BracketFinder TooManyEvaluationsException
                 Key: MATH-1295
                 URL: https://issues.apache.org/jira/browse/MATH-1295
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.5
            Reporter: Luke Lindsay
            Priority: Minor


I am getting the exception below when using NonLinearConjugateGradientOptimizer.  

 org.apache.commons.math3.exception.TooManyEvaluationsException: illegal state: maximal count (50) exceeded: evaluations
	at org.apache.commons.math3.optim.univariate.BracketFinder.eval(BracketFinder.java:287)
	at org.apache.commons.math3.optim.univariate.BracketFinder.search(BracketFinder.java:181)
	at org.apache.commons.math3.optim.nonlinear.scalar.LineSearch.search(LineSearch.java:127)
	at org.apache.commons.math3.optim.nonlinear.scalar.gradient.NonLinearConjugateGradientOptimizer.doOptimize(NonLinearConjugateGradientOptimizer.java:283)
	at org.apache.commons.math3.optim.nonlinear.scalar.gradient.NonLinearConjugateGradientOptimizer.doOptimize(NonLinearConjugateGradientOptimizer.java:47)
	at org.apache.commons.math3.optim.BaseOptimizer.optimize(BaseOptimizer.java:154)
	at org.apache.commons.math3.optim.BaseMultivariateOptimizer.optimize(BaseMultivariateOptimizer.java:66)
	at org.apache.commons.math3.optim.nonlinear.scalar.MultivariateOptimizer.optimize(MultivariateOptimizer.java:64)
	at org.apache.commons.math3.optim.nonlinear.scalar.GradientMultivariateOptimizer.optimize(GradientMultivariateOptimizer.java:74)
	at org.apache.commons.math3.optim.nonlinear.scalar.gradient.NonLinearConjugateGradientOptimizer.optimize(NonLinearConjugateGradientOptimizer.java:245)


NonLinearConjugateGradientOptimizer calls the no argument constructor of BracketFinder which defaults its max evaluations to 50.  I tried changing the source code of BracketFinder so that the default max evaluations is 200 and since making the change have not encountered the problem.  I was wondering if BracketFinder could have its default max evaluations increased or if NonLinearConjugateGradientOptimizer could set a higher max evaluations when it constructs a BracketFinder.




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