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https://issues.apache.org/jira/browse/MAHOUT-1428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967799#comment-13967799
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Sebastian Schelter commented on MAHOUT-1428:
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This is a good idea, would like to contribute a patch for that?
> Recommending already consumed items
> -----------------------------------
>
> Key: MAHOUT-1428
> URL: https://issues.apache.org/jira/browse/MAHOUT-1428
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Reporter: Mario Levitin
> Fix For: 1.0
>
>
> Mahout does not recommend items which are already consumed by the user.
> For example,
> In the getAllOtherItems method of GenericUserBasedRecommender class there is
> the following line
> possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID));
> which removes user's items from the possibleItemIDs to prevent these items
> from being recommended to the user. This is ok for many recommendation cases
> but for many other cases it is not.
> The Recommender classes (I mean all of them, NN-based and SVD-based as well
> as hadoop and non-hadoop versions) might have a parameter for this for
> excluding or not excluding user items in the returned recommendations.
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