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Date: Thu, 13 Mar 2014 16:01:55 +0000 (UTC)
From: "Adam Ilardi (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
Message-ID: <JIRA.12701245.1394721842598.60442.1394726515402@arcas>
In-Reply-To: <JIRA.12701245.1394721842598@arcas>
References: <JIRA.12701245.1394721842598@arcas>
Subject: [jira] [Comment Edited] (MAHOUT-1453)
 ImplicitFeedbackAlternatingLeastSquaresSolver add support for user supplied
 confidence functions
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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 ] 

Adam Ilardi edited comment on MAHOUT-1453 at 3/13/14 4:01 PM:
--------------------------------------------------------------

The only solution I can think of it to create a new set of classes that lets me extend or inject the confidence function. Conversely I could add more optional parameters to the existing ALSWRFactorizer class


was (Author: adamilardi):
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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