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https://issues.apache.org/jira/browse/MAHOUT-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378571#comment-14378571
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Dmitriy Lyubimov commented on MAHOUT-1648:
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Re: "thin QR": this is also known simply as Cholesky QR (also mentioned in TSQR
paper).
What we have in MR however is a far more numerically stable version based on
re-ordered Givens rotations and using reduction schemes very similar to those
suggested in TSQR. More strict definition of that algorithm is given in Nathan
Halko's dissertation describing our MR version of stochastic SVD. I am thinking
of resurrecting that for SSVD flows if it turns out Cholesky QR is too unstable
for my purposes (it already has been, annoyingly, in a number of situations).
> Update Mahout's CMS for 0.10.0
> ------------------------------
>
> Key: MAHOUT-1648
> URL: https://issues.apache.org/jira/browse/MAHOUT-1648
> Project: Mahout
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 0.9
> Reporter: Pat Ferrel
> Assignee: Andrew Palumbo
> Priority: Blocker
> Fix For: 0.10.0
>
>
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