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https://issues.apache.org/jira/browse/MAHOUT-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979232#action_12979232
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Sean Owen commented on MAHOUT-559:
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I committed a version of your patch with minor changes according to the
project's (my) style preferences. Take a look and let me know if this works.
For instance in particular I wanted to output to the logs, not a PrintWriter.
> 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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