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https://issues.apache.org/jira/browse/MAHOUT-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880969#action_12880969
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Emerson Murphy-HIll commented on MAHOUT-421:
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Bleh. Sorry. I'm getting myself confused. In AbstractSimilarity, userSimilarity
*always* centers the data, whereas itemSimilarity is conditional. The problem,
then, is with userSimilarity.
> Item similarity in AbstractSimilarity always centers data
> ---------------------------------------------------------
>
> Key: MAHOUT-421
> URL: https://issues.apache.org/jira/browse/MAHOUT-421
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Reporter: Emerson Murphy-HIll
>
> I'm trying to use UncenteredCosineSimilarity. When calculating similarity
> between users in AbstractSimilarity>>itemSimilarity, there's a condition to
> determine whether to center the data:
> double result;
> if (centerData) {
> ... get result with centering
> } else {
> ... get result without
> }
>
> In AbstractSimilarity>>itemSimilarity, there's no conditional. It *always*
> centers the data. Shouldn't it only center the data when centerData is true?
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