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https://issues.apache.org/jira/browse/MAHOUT-135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722171#action_12722171
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Grant Ingersoll commented on MAHOUT-135:
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See
http://www.lucidimagination.com/search/document/4a2631a4adf77262/jira_commented_mahout_135_allow_filedatamodel_to_transpose_users_and_items
If you have thousands of recommendations and you want to transpose them from
the original, would you rather rewrite the file or just flip a switch on the
FileDataModel?
> Allow FileDataModel to transpose users and items
> ------------------------------------------------
>
> Key: MAHOUT-135
> URL: https://issues.apache.org/jira/browse/MAHOUT-135
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Reporter: Grant Ingersoll
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.2
>
> Attachments: MAHOUT-135.patch
>
>
> Sometimes it would be nice to flip around users and items in the
> FileDataModel. This patch adds a transpose boolean that flips userId and
> itemId in the processLine method.
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