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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-763) Map-Side Distance Comparison
Date Sat, 16 Jul 2011 12:44:59 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Owen updated MAHOUT-763:
-----------------------------

    Attachment: SeedVectorUtil.patch

This is what I had in mind -- it looks like more change than it is due to whitespace. The
key is just letting it take care of iterating over files in subdirs. Just a little tidier,
not a big deal either way.

I can make a similar change in kmeans.

> 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,
SeedVectorUtil.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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