Mario Levitin created MAHOUT-1428:
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Summary: 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
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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