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https://issues.apache.org/jira/browse/MAHOUT-925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168927#comment-13168927
]
Hudson commented on MAHOUT-925:
-------------------------------
Integrated in Mahout-Quality #1252 (See
[https://builds.apache.org/job/Mahout-Quality/1252/])
MAHOUT-925 Add basic idea of 'reach'
srowen : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1213930
Files :
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/eval/IRStatistics.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/GenericRecommenderIRStatsEvaluator.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/eval/IRStatisticsImpl.java
> Evaluate the reach of recommender algorithms
> --------------------------------------------
>
> Key: MAHOUT-925
> URL: https://issues.apache.org/jira/browse/MAHOUT-925
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.5
> Reporter: Anatoliy Kats
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.6
>
> Attachments: MAHOUT-925.patch, MAHOUT-925.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The evaluation of a CF algorithm should include reach, the proportion of
> users for whom a recommendation could be made. An algorithm usually has a
> cutoff value on the confidence of the recommender, and if it is not high
> enough, no recommendation is made. The number of requested recommendations,
> or this parameter could be varied as part of the evaluation. The proposed
> patch adds this.
> My build with this patch breaks
> testMapper(org.apache.mahout.classifier.df.mapreduce.partial.Step1MapperTest):
> org.apache.mahout.classifier.df.node.Leaf.<init>(I)V . The test seems
> unrelated to the patch, so I am assuming this is broken in the trunk head as
> well. Unfortunately I am under a deadline, and I do not have time to write
> tests for the patch.
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