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Posted to dev@mahout.apache.org by "Suneel Marthi (JIRA)" <ji...@apache.org> on 2015/08/07 17:56:50 UTC

[jira] [Closed] (MAHOUT-1757) Small fix in spca formula

     [ https://issues.apache.org/jira/browse/MAHOUT-1757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suneel Marthi closed MAHOUT-1757.
---------------------------------

> Small fix in spca formula
> -------------------------
>
>                 Key: MAHOUT-1757
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1757
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Dmitriy Lyubimov
>            Assignee: Suneel Marthi
>             Fix For: 0.10.2, 0.11.0
>
>
> there's small error in the spca, Y correction inside power iterations should really be -(s_b-xi'xi*s_b). It doesn't seem to affect much the result but this is a small error (~7-th-8th digit after dot) it introduces when power iterations are used. 



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