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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAHOUT-559) Compare Recommender output by order of recommendations.
Date Tue, 07 Dec 2010 10:30:09 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968667#action_12968667
] 

Sean Owen commented on MAHOUT-559:
----------------------------------

Sounds good, let me review and perhaps tweak a few things (copyright headers, formatting,
etc.) and commit

> 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: 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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