[jira] [Updated] (MAHOUT-687) Random generator objects- slight refactor

["Lance Norskog (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lance Norskog updated MAHOUT-687:
---------------------------------

    Attachment: MAHOUT-687.patch

> Random generator objects- slight refactor
> -----------------------------------------
>
>                 Key: MAHOUT-687
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-687
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Lance Norskog
>            Priority: Minor
>         Attachments: MAHOUT-687.patch
>
>
> Problems:
> * Uncommons MersenneTwisterRNG, the default RandomUtils.getRandom(), ignores setSeed without throwing an error.
> * The project wants to move off Uncommons anyway.
> This patch uses the org.apache.commons.math.random.RandomGenerator classes instead of org.apache.uncommons.maths.RepeatableRNG classes.
> Testcases: All math test cases pass except for org.apache.mahout.math.stats.LogLikelihoodTest. 
> Other package tests fail that are mostly about testing random-oriented classes; not a surprise.
> Almost all tests that use random numbers in algorithms still pass; this is a good sign of their stability.
> .
> Still, a lot of tests have to be fiddled to make this commit.

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