[jira] [Commented] (MAHOUT-1390) SVD hangs for certain inputs

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

    [ https://issues.apache.org/jira/browse/MAHOUT-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13860154#comment-13860154 ] 

Hudson commented on MAHOUT-1390:
--------------------------------

SUCCESS: Integrated in Mahout-Quality #2393 (See [https://builds.apache.org/job/Mahout-Quality/2393/])
MAHOUT-1390: SVN hangs for certain inputs (smarthi: rev 1554749)
* /mahout/trunk/CHANGELOG
MAHOUT-1390 - Fixes for SVD hang. (tdunning: rev 1554748)
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/SingularValueDecomposition.java
* /mahout/trunk/math/src/test/java/org/apache/mahout/math/TestSingularValueDecomposition.java
* /mahout/trunk/math/src/test/resources/hanging-svd.tsv


> SVD hangs for certain inputs
> ----------------------------
>
>                 Key: MAHOUT-1390
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1390
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>    Affects Versions: 0.8
>            Reporter: Ted Dunning
>            Priority: Critical
>             Fix For: 0.9
>
>         Attachments: MAHOUT-1390.patch
>
>
> For certain inputs, the SingularValueDecomposition implementation that we have doesn't detect that it has effectively converged and runs into an infinite loop.
> Luckily, there is a fix that has been added to the Jama implementation that our SVD is ultimately based on and that fix works for our problem.



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