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https://issues.apache.org/jira/browse/MAHOUT-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979254#action_12979254
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Hudson commented on MAHOUT-559:
-------------------------------
Integrated in Mahout-Quality #545 (See
[https://hudson.apache.org/hudson/job/Mahout-Quality/545/])
MAHOUT-559
> Compare Recommender output by order of recommendations.
> -------------------------------------------------------
>
> Key: MAHOUT-559
> URL: https://issues.apache.org/jira/browse/MAHOUT-559
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Reporter: Lance Norskog
> Attachments: MAHOUT-559.patch, OrderBasedRecommenderEvaluator.patch
>
>
> The existing RecommenderEvaluator
> (AverageAbsoluteDifferenceRecommenderEvaluator.java) has a very limited API.
> It evaluates a Recommender's performance on a training v.s. test scenario. It
> does not allow comparing the outputs of different recommenders against the
> same data model. Also, I could not figure out how its comparison criteria.
> OrderBasedRecommenderEvaluator compares the output of two recommenders. It
> only checks the order of the items in the recommendations, ignoring the
> returned preference values.
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