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https://issues.apache.org/jira/browse/MATH-1057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812474#comment-13812474
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Thomas Neidhart commented on MATH-1057:
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For the testDiffPow testcase, I further debugged with the two different jdks,
and after iteration 2219 the objective function output changes.
The difference/error then accumulates and results that the algorithm converges
much slower. I could track down the problem to the Math implementation, most
likely the sqrt or exp. Changing all the Math calls to our own FastMath solves
the problem and the test executes correctly for all jdks.
I wonder why we use Math in the first place, as normally we eat our own
dog-food and use FastMath.
btw. the problem also is existent in the 3.2 release so not at all related to
your previous patch.
> BOBYQAOptimizerTest has two failing tests
> -----------------------------------------
>
> Key: MATH-1057
> URL: https://issues.apache.org/jira/browse/MATH-1057
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.2
> Environment: Mac OS X 10.9 and also Linux 3.4 kernel; Java 7; Maven
> 3.1.1
> Reporter: Sean Owen
> Priority: Minor
>
> I see two test failures, in both the copies of BOBYQAOptimizerTest:
> {code}
> Failed tests:
> BOBYQAOptimizerTest.testAckley:209->doTest:282->doTest:338 expected:<0.0>
> but was:<1.047765607609108E-8>
> BOBYQAOptimizerTest.testAckley:208->doTest:281->doTest:336 expected:<0.0>
> but was:<1.047765607609108E-8>
> Tests in error:
> BOBYQAOptimizerTest.testDiffPow:187->doTest:282->doTest:322 »
> TooManyEvaluations
> BOBYQAOptimizerTest.testDiffPow:186->doTest:281->doTest:326 »
> TooManyEvaluations
> {code}
> (This predated the patches I've worked on so I don't think it's me!)
> I tried on Mac OS X and Linux and see the same, so don't think it is an
> environment issue. I'll see if a little digging can uncover the issue from a
> recent commit.
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