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Posted to dev@mahout.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2011/03/22 16:36:05 UTC
[jira] [Created] (MAHOUT-630) Small bug in WeightedRunningAverage;
add WeightedRunningAverageAndStdDev
Small bug in WeightedRunningAverage; add WeightedRunningAverageAndStdDev
------------------------------------------------------------------------
Key: MAHOUT-630
URL: https://issues.apache.org/jira/browse/MAHOUT-630
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Affects Versions: 0.4
Reporter: Sean Owen
Assignee: Sean Owen
Priority: Minor
Fix For: 0.5
There's a problem in the WeightedRunningAverage handling of a new weighted datum. While looking at that I said, hey, we could use WeightedRunningAverageAndStdDev to go with it. And some tests.
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[jira] [Resolved] (MAHOUT-630) Small bug in WeightedRunningAverage;
add WeightedRunningAverageAndStdDev
Posted by "Sean Owen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved MAHOUT-630.
------------------------------
Resolution: Fixed
> Small bug in WeightedRunningAverage; add WeightedRunningAverageAndStdDev
> ------------------------------------------------------------------------
>
> Key: MAHOUT-630
> URL: https://issues.apache.org/jira/browse/MAHOUT-630
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
> Labels: average, standard-deviation, weighted
> Fix For: 0.5
>
> Attachments: MAHOUT-630.patch
>
>
> There's a problem in the WeightedRunningAverage handling of a new weighted datum. While looking at that I said, hey, we could use WeightedRunningAverageAndStdDev to go with it. And some tests.
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[jira] [Updated] (MAHOUT-630) Small bug in WeightedRunningAverage;
add WeightedRunningAverageAndStdDev
Posted by "Sean Owen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen updated MAHOUT-630:
-----------------------------
Attachment: MAHOUT-630.patch
Will commit shortly if there are no objections.
> Small bug in WeightedRunningAverage; add WeightedRunningAverageAndStdDev
> ------------------------------------------------------------------------
>
> Key: MAHOUT-630
> URL: https://issues.apache.org/jira/browse/MAHOUT-630
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
> Labels: average, standard-deviation, weighted
> Fix For: 0.5
>
> Attachments: MAHOUT-630.patch
>
>
> There's a problem in the WeightedRunningAverage handling of a new weighted datum. While looking at that I said, hey, we could use WeightedRunningAverageAndStdDev to go with it. And some tests.
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[jira] [Commented] (MAHOUT-630) Small bug in
WeightedRunningAverage; add WeightedRunningAverageAndStdDev
Posted by "Ted Dunning (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009684#comment-13009684 ]
Ted Dunning commented on MAHOUT-630:
------------------------------------
Looks fine. It uses the less accurate formula for standard deviation, but that isn't a big deal in most applications.
To do better would require adapting Welford's method which would require some thought (which this implementation does not).
There is also the question of progressively accumulating error. Again, I don't think that the applications of this version
require that be addressed.
> Small bug in WeightedRunningAverage; add WeightedRunningAverageAndStdDev
> ------------------------------------------------------------------------
>
> Key: MAHOUT-630
> URL: https://issues.apache.org/jira/browse/MAHOUT-630
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
> Labels: average, standard-deviation, weighted
> Fix For: 0.5
>
> Attachments: MAHOUT-630.patch
>
>
> There's a problem in the WeightedRunningAverage handling of a new weighted datum. While looking at that I said, hey, we could use WeightedRunningAverageAndStdDev to go with it. And some tests.
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[jira] [Commented] (MAHOUT-630) Small bug in
WeightedRunningAverage; add WeightedRunningAverageAndStdDev
Posted by "Hudson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009758#comment-13009758 ]
Hudson commented on MAHOUT-630:
-------------------------------
Integrated in Mahout-Quality #684 (See [https://hudson.apache.org/hudson/job/Mahout-Quality/684/])
MAHOUT-630 weighted average fix and add stddev
> Small bug in WeightedRunningAverage; add WeightedRunningAverageAndStdDev
> ------------------------------------------------------------------------
>
> Key: MAHOUT-630
> URL: https://issues.apache.org/jira/browse/MAHOUT-630
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
> Labels: average, standard-deviation, weighted
> Fix For: 0.5
>
> Attachments: MAHOUT-630.patch
>
>
> There's a problem in the WeightedRunningAverage handling of a new weighted datum. While looking at that I said, hey, we could use WeightedRunningAverageAndStdDev to go with it. And some tests.
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