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https://issues.apache.org/jira/browse/MAHOUT-1757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630777#comment-14630777
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ASF GitHub Bot commented on MAHOUT-1757:
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GitHub user smarthi opened a pull request:
https://github.com/apache/mahout/pull/152
MAHOUT-1757: (d)spca small power iteration fix and style
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/smarthi/mahout mahout-0.10.x-spcafix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/mahout/pull/152.patch
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 <[email protected]>
Date: 2015-07-17T04:56:17Z
(d)spca small power iteration fix and style
----
> 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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