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https://issues.apache.org/jira/browse/MAHOUT-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13933455#comment-13933455
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Adam Ilardi commented on MAHOUT-1453:
-------------------------------------
The only solution I can think of it to create a new class that lets me extend
or inject the confidence function. Conversely I could add more optional
parameters to the existing ALSWRFactorizer class
> ImplicitFeedbackAlternatingLeastSquaresSolver add support for user supplied
> confidence functions
> ------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1453
> URL: https://issues.apache.org/jira/browse/MAHOUT-1453
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.9
> Reporter: Adam Ilardi
> Assignee: Sebastian Schelter
> Priority: Minor
> Labels: newbie, patch, performance
> Fix For: 1.0
>
>
> double confidence(double rating) {
> return 1 + alpha * rating;
> }
> The original paper mentions other functions that could be used as well. @ the
> moment It's not easy for a user to change this without compiling the source.
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