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https://issues.apache.org/jira/browse/MAHOUT-493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906817#action_12906817
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Sebastian Schelter commented on MAHOUT-493:
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I did not like the idea to load a file containing all user/item pairs to filter
into memory in the final Reducer which was proposed on the mailing list, as
this might introduce scaling issues.
I think I found a better way to include the filtering logic in the distributed
recommendation process. For a user that should not be recommended an item we
join an artificial NaN summand into the estimation of his/her preference
towards that item so that this item will automatically be excluded.
Patch is coming soon.
> Explicit filter for user/item pairs in
> o.a.m.cf.taste.hadoop.item.RecommenderJob
> --------------------------------------------------------------------------------
>
> Key: MAHOUT-493
> URL: https://issues.apache.org/jira/browse/MAHOUT-493
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Affects Versions: 0.5
> Reporter: Sebastian Schelter
>
> It should be possible to explicitly prevent having a given item being
> recommended to a given user.
> This filter is necessary because that user might have stated to never be
> shown a recommended item again.
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