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From Em <>
Subject Re: Exclude by RuleSet
Date Fri, 01 Jul 2011 18:03:22 GMT
Hi Sean,

I am not very familiar with the code itself, however I have no problem
with digging into it.

I guess the CandidateItemStrategy and the Rescorer are usable for all
kinds of recommendations: user-user, user-item, item-item etc. and so I
can create a generic (or general) implementation for the problem?

Could you explain more of the tradeoffs for both
implementation-possibilities, please?


Am 01.07.2011 19:01, schrieb Sean Owen:
> 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
>> --
>> View this message in context:
>> Sent from the Mahout User List mailing list archive at

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