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From Sean Owen <>
Subject Re: Exclude by RuleSet
Date Fri, 01 Jul 2011 17:01:32 GMT
The short answer is that you'd have to modify the code to inject this
kind of logic -- though you might get away with just using a custom
CandidateItemStrategy in an item-based recommender.

A Rescorer will cause it to not bother computing estimated values for
unwanted items though, so I think it already does what you intend.

On Fri, Jul 1, 2011 at 5:56 PM, Em <> wrote:
> Hello list,
> is it possible to filter out some items/users from the
> recommendation-process?
> In some cases one does not want to include information from some sources in
> special situations.
> As an example you can imagine an onlineshop. If you click on the category
> "women" it would be the best to only show recommendations for this
> main-category rather than also showing some stuff for men.
> A Rescorer could be a solution to filter out those unwanted results *after*
> the big part is done (am I correct?), however I do not want to spend
> ressources on computing probabilities for items that are definitly unwanted
> for the resultset.
> What I want is something like a
> SELECT col1, col2, col3 FROM myData WHERE category = "women" OR category =
> "subcategoryOfWomen"
> and than do the computation on top of this dataset.
> Is this possible with Mahout?
> Regards,
> Em
> --
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