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https://issues.apache.org/jira/browse/MAHOUT-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Dunning updated MAHOUT-1390:
--------------------------------
Attachment: MAHOUT-1390.patch
Here is a patch that includes a test that fails if the SVD doesn't converge as
well as a patch that fixes the hang.
That test has a timeout, but the normal time for completion is <<400 ms on my
laptop and the timeout is 2000 ms so I think this is safe.
> 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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