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Posted to dev@mahout.apache.org by "Hudson (Commented) (JIRA)" <ji...@apache.org> on 2012/02/08 03:08:59 UTC
[jira] [Commented] (MAHOUT-963) GenericUserPreferenceArray and
GenericItemPreferenceArray use selection sorts
[ https://issues.apache.org/jira/browse/MAHOUT-963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203146#comment-13203146 ]
Hudson commented on MAHOUT-963:
-------------------------------
Integrated in Mahout-Quality #1340 (See [https://builds.apache.org/job/Mahout-Quality/1340/])
MAHOUT-963 additional change to "less than" for reversed sort, which is necessary in one test
srowen : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1241616
Files :
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/model/GenericItemPreferenceArray.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/model/GenericUserPreferenceArray.java
> GenericUserPreferenceArray and GenericItemPreferenceArray use selection sorts
> -----------------------------------------------------------------------------
>
> Key: MAHOUT-963
> URL: https://issues.apache.org/jira/browse/MAHOUT-963
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.6
> Reporter: Bryce Nyeggen
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.7
>
> Attachments: MAHOUT-963.diff
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> Both PreferenceArray implementations use selection sorts with poor performance. These sorts are invoked during construction of GenericDataModels, causing excessive construction time.
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