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https://issues.apache.org/jira/browse/MAHOUT-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968640#action_12968640
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Lance Norskog commented on MAHOUT-558:
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bq. Which recommender doesn't return the known pref value? That sounds like an
unintentional behavior.
This is an algorithm I'm writing, not one of the existing recommenders. The
original data goes through a processing stage, and the datamodel only saves the
output. It does not even know which users proffered a rating.
> Extend ItembasedRecommender to offer different "exclusion modes" when
> computing most similar items to a collection of input items
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-558
> URL: https://issues.apache.org/jira/browse/MAHOUT-558
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Affects Versions: 0.5
> Reporter: Sebastian Schelter
> Attachments: MAHOUT-558-2.patch, MAHOUT-558.patch
>
>
> GenericItembased Recommender currently excludes all items that are not
> similar at least one of the input items when computing the most similar items
> to a collection of items. We should introduce a way to have the user decide
> whether he/she wants this behavior or he/she wants to have all items included
> that are similar to at least one of the input items, which is more useful in
> practice in my experience.
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