[
https://issues.apache.org/jira/browse/MAHOUT-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579708#comment-13579708
]
Ted Dunning commented on MAHOUT-1148:
-------------------------------------
The difference was just a matter of rewriting the algorithm using vector
operations instead of element by element math. You can probably get another 2x
out of the algorithm pretty easily and possibly 5x with some cleverness. I
didn't spend any time optimizing this code at all.
> QR Decomposition is too slow
> ----------------------------
>
> Key: MAHOUT-1148
> URL: https://issues.apache.org/jira/browse/MAHOUT-1148
> Project: Mahout
> Issue Type: Bug
> Reporter: Ted Dunning
>
> A user reported that QR decomposition is too slow. I coded up a replacement
> that can be 10x faster under certain cases and the new version is also tested.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
