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https://issues.apache.org/jira/browse/MAHOUT-1428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13990307#comment-13990307
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Hudson commented on MAHOUT-1428:
--------------------------------
FAILURE: Integrated in Mahout-Quality #2604 (See
[https://builds.apache.org/job/Mahout-Quality/2604/])
MAHOUT-1428 Recommending already consumed items (ssc: rev 1592656)
* /mahout/trunk/CHANGELOG
*
/mahout/trunk/examples/src/main/java/org/apache/mahout/cf/taste/example/bookcrossing/BookCrossingBooleanRecommender.java
*
/mahout/trunk/examples/src/main/java/org/apache/mahout/cf/taste/example/bookcrossing/BookCrossingRecommender.java
*
/mahout/trunk/examples/src/main/java/org/apache/mahout/cf/taste/example/kddcup/track1/Track1Recommender.java
*
/mahout/trunk/examples/src/main/java/org/apache/mahout/cf/taste/example/kddcup/track2/Track2Recommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/AllSimilarItemsCandidateItemsStrategy.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/AllUnknownItemsCandidateItemsStrategy.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/CachingRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefUserBasedRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/GenericUserBasedRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/ItemUserAverageRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/PreferredItemsNeighborhoodCandidateItemsStrategy.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/RandomRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.java
*
/mahout/trunk/mrlegacy/src/main/java/org/apache/mahout/cf/taste/recommender/Recommender.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/AllUnknownItemsCandidateItemsStrategyTest.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommenderTest.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/GenericUserBasedRecommenderTest.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/MockRecommender.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/PreferredItemsNeighborhoodCandidateItemsStrategyTest.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategyTest.java
*
/mahout/trunk/mrlegacy/src/test/java/org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommenderTest.java
> Recommending already consumed items
> -----------------------------------
>
> Key: MAHOUT-1428
> URL: https://issues.apache.org/jira/browse/MAHOUT-1428
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 1.0
> Reporter: Mario Levitin
> Labels: easyfix
> Fix For: 1.0
>
> Attachments: MAHOUT-1428.patch
>
>
> 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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