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https://issues.apache.org/jira/browse/MAHOUT-305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837193#action_12837193
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Sean Owen commented on MAHOUT-305:
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I just don't think it can be random. it's like doing a PR test on search 
results and defining "relevant" documents as some randomly-chosen subset of all 
documents.

> Combine both cooccurrence-based CF M/R jobs
> -------------------------------------------
>
>                 Key: MAHOUT-305
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-305
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.2
>            Reporter: Sean Owen
>            Assignee: Ankur
>            Priority: Minor
>
> We have two different but essentially identical MapReduce jobs to make 
> recommendations based on item co-occurrence: 
> org.apache.mahout.cf.taste.hadoop.{item,cooccurrence}. They ought to be 
> merged. Not sure exactly how to approach that but noting this in JIRA, per 
> Ankur.

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