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From "Lance Norskog (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-687) Random generator objects- slight refactor
Date Mon, 09 May 2011 03:48:03 GMT

     [ 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, 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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