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From Phil Steitz <>
Subject Re: [MATH] Jenkins unit test failure
Date Sun, 11 Jan 2015 05:49:05 GMT
On 1/9/15 6:09 PM, sebb wrote:
> On 10 January 2015 at 01:01, Phil Steitz <> wrote:
>> On 1/9/15 5:32 PM, sebb wrote:
>>> On 9 January 2015 at 23:48, sebb <> wrote:
>>>> Of the last 6 runs, only 1 had a problem with unit test failures.
>>>> All the builds ran on ubuntu3, apart from the failure which ran on H10.
>>>> This may have some bearing on the result; I don't yet know.
>>>> I had a quick look at 2 tests that failed:
>>>> SimpleRegressionTest.testPerfect
>>>> SimpleRegressionTest.testPerfectNegative
>>>> Although the test case has some instance data, these particular tests
>>>> do not use any, so it does not look like a concurrency issue in the
>>>> unit test itself.
>>>> The SimpleRegression class has mutable instance data, but the test
>>>> cases create their own instance.
>>>> I don't know anything about the math functions involved, but it looks
>>>> as though Infinity might result from getSignificance() if
>>>> getSlopeStdErr() returns 0, as the latter is used as a divisor. Or if
>>>> the field sumXX is 0 because that is also used as a divisor.
>>>> Maybe the H10 host has different floating point hardware?
>>>> I'll try running some more tests on H10.
>>> the build failed again on H10; exactly the same tests failed as before:
>>> This test:
>>> Previous failure:
>> This is actually a bug.  Thanks, sebb (and Jenkins)!
>> Has been here since 1.x.  What is going on is that the data sets
>> used in the test cases are set up to be perfect linear
>> relationships, which should in fact lead to mean square error (and
>> hence slope standard error) equal to 0.  The Jenkins box must be
>> getting exact 0.  The funny thing is the test is there to validate
>> correct performance for models like this.  Its success unfortunately
>> depends on poor precision.
>> I will open a JIRA for this.  I don't think it is a release blocker
>> for 3.4.1, as I am sure you would get the same thing in any earlier
>> version of [math].
> OK good to know.
> I'll leave the H10 Jenkins job for now to make it easy to retest.

My first guess here was wrong.  The infinities are being handled
correctly for the JDKs I have.  Something must be going awry in the
t distribution cumulative probability computation for +INF on the
box that is failing.  Is there a way to find out exactly what JDK
and OS version are being used? 

>> Phil
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