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Date: Sat, 16 Jul 2011 10:56:59 +0000 (UTC)
From: "Grant Ingersoll (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
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Subject: [jira] [Commented] (MAHOUT-763) Map-Side Distance Comparison
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    [ https://issues.apache.org/jira/browse/MAHOUT-763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066401#comment-13066401 ] 

Grant Ingersoll commented on MAHOUT-763:
----------------------------------------

The code is more or less a copy of what's in KMeans for loading the Cluster objects.

> Map-Side Distance Comparison
> ----------------------------
>
>                 Key: MAHOUT-763
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-763
>             Project: Mahout
>          Issue Type: New Feature
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.6
>
>         Attachments: MAHOUT-763.patch, MAHOUT-763.patch, MAHOUT-763.patch, MAHOUT-763.patch
>
>
> KMeans currently on the map-side calculates the distance between a set of seeds and all other vectors.  It would be handy to have a generalization of this that, given a set of vectors that fits in memory (the seeds) and other points, emit <seed id, other id, distance> according to the distance measure.  This is similar to the RowSimilarityJob, but much simpler and not as general purpose.

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