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https://issues.apache.org/jira/browse/MAHOUT-653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016677#comment-13016677
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Lance Norskog commented on MAHOUT-653:
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Use case: L1/L2 distances are not useful with very high dimensions. Fractional
L is more useful, and thus we need a fast but inaccurate pow() implementation.
Citations:
[http://arnetminer.org/viewpub.do?pid=303924]
[http://portal.acm.org/citation.cfm?id=656414]
Postscript version:
[Postscript|http://www.charuaggarwal.net/surprise.ps]
I found a PDF somewhere, but it is owned by the ACM.
> Approximations to standard functions
> ------------------------------------
>
> Key: MAHOUT-653
> URL: https://issues.apache.org/jira/browse/MAHOUT-653
> Project: Mahout
> Issue Type: New Feature
> Reporter: Lance Norskog
> Attachments: MAHOUT-653.patch
>
>
> These give approximate versions of pow(value, exponent), exp(value), and
> natural log(value).
> log() and exp() stolen from:
> [http://martin.ankerl.com/2007/02/11/optimized-exponential-functions-for-java/]
> pow() stolen from:
> [http://martin.ankerl.com/2007/10/04/optimized-pow-approximation-for-java-and-c-c/]
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