On 10 January 2015 at 01:01, Phil Steitz <phil.ste...@gmail.com> wrote: > On 1/9/15 5:32 PM, sebb wrote: >> On 9 January 2015 at 23:48, sebb <seb...@gmail.com> 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: >> https://builds.apache.org/job/Commons%20Math%20H10/1/console >> >> Previous failure: >> https://builds.apache.org/job/Commons%20Math/14/console > > 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. > Phil >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >> For additional commands, e-mail: dev-h...@commons.apache.org >> >> > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
