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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-1757) Small fix in spca formula
Date Fri, 17 Jul 2015 04:58:04 GMT


ASF GitHub Bot commented on MAHOUT-1757:

GitHub user smarthi opened a pull request:

    MAHOUT-1757: (d)spca small power iteration fix and style


You can merge this pull request into a Git repository by running:

    $ git pull mahout-0.10.x-spcafix

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #152
commit a4860c0c10dd8f01cbb86885f7cabb6aaceb4981
Author: Suneel Marthi <>
Date:   2015-07-17T04:56:17Z

    (d)spca small power iteration fix and style


> Small fix in spca formula
> -------------------------
>                 Key: MAHOUT-1757
>                 URL:
>             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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