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https://issues.apache.org/jira/browse/MAHOUT-305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861381#action_12861381
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Sean Owen commented on MAHOUT-305:
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I see, fair enough. Even for this simplistic initial system, something better
is called for. Perhaps the mappers can keep a count of how many times each item
has been seen and favor co-occurrences among items that have *not* been seen.
they wouldn't have a global count but such a simple heuristic may be efficient
and effective. For now I might arbitrarily prune, say, for user vectors with
more than 50 preferences.
> 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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