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Date: Sun, 3 Nov 2013 20:24:17 +0000 (UTC)
From: "Thomas Neidhart (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <JIRA.12677282.1383503593048.13421.1383510257500@arcas>
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References: <JIRA.12677282.1383503593048@arcas>
Subject: [jira] [Commented] (MATH-1057) BOBYQAOptimizerTest has two failing
 tests
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    [ https://issues.apache.org/jira/browse/MATH-1057?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D13812=
474#comment-13812474 ]=20

Thomas Neidhart commented on MATH-1057:
---------------------------------------

For the testDiffPow testcase, I further debugged with the two different jdk=
s, and after iteration 2219 the objective function output changes.

The difference/error then accumulates and results that the algorithm conver=
ges 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 FastMa=
th 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; Mav=
en 3.1.1
>            Reporter: Sean Owen
>            Priority: Minor
>
> I see two test failures, in both the copies of BOBYQAOptimizerTest:
> {code}
> Failed tests:=20
>   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:=20
>   BOBYQAOptimizerTest.testDiffPow:187->doTest:282->doTest:322 =C2=BB TooM=
anyEvaluations
>   BOBYQAOptimizerTest.testDiffPow:186->doTest:281->doTest:326 =C2=BB TooM=
anyEvaluations
> {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 e=
nvironment issue. I'll see if a little digging can uncover the issue from a=
 recent commit.


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