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https://issues.apache.org/jira/browse/MAHOUT-824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119016#comment-13119016
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Hudson commented on MAHOUT-824:
-------------------------------
Integrated in Mahout-Quality #1077 (See
[https://builds.apache.org/job/Mahout-Quality/1077/])
Part of MAHOUT-824 -- some additional tests
srowen : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1178133
Files :
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/common/FullRunningAverage.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/common/FullRunningAverageAndStdDev.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/impl/common/FastByIDMapTest.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/impl/common/RunningAverageAndStdDevTest.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/impl/common/RunningAverageTest.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/impl/recommender/slopeone/MemoryDiffStorageTest.java
> FastByIDRunningAverage: Optimize SlopeOneRecommender by optimizing
> MemoryDiffStorage
> ------------------------------------------------------------------------------------
>
> Key: MAHOUT-824
> URL: https://issues.apache.org/jira/browse/MAHOUT-824
> Project: Mahout
> Issue Type: Improvement
> Reporter: Lance Norskog
> Assignee: Sean Owen
> Priority: Trivial
> Fix For: 0.6
>
> Attachments: MAHOUT-824.patch, MAHOUT-824.short.patch
>
>
> The SlopeOneRecommender has by far the best RMS of all of the online
> recommenders in Mahout (that I've found). Unfortunately the implementation
> also uses much more memory and is unuseable on my laptop.
> This patch optimizes memory (and speed) by folding
> FastByIDMap<RunningAverage> into one class: FastByIDRunningAverage. This is
> what it sounds like: a Long-addressable array of running averages (and
> optionally standard deviation).
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