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Date: Mon, 11 Mar 2013 20:37:15 +0000 (UTC)
From: "Shannon Quinn (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
Message-ID: <JIRA.12636422.1363027657065.420723.1363034235094@arcas>
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Subject: [jira] [Comment Edited] (MAHOUT-1159) Add SSVD option to
 SpectralKMeans
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    [ https://issues.apache.org/jira/browse/MAHOUT-1159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599237#comment-13599237 ] 

Shannon Quinn edited comment on MAHOUT-1159 at 3/11/13 8:36 PM:
----------------------------------------------------------------

Excellent points, thanks. Here's a new patch with the suggested fixes, let me know if that works.

The only reason I noticed the discrepancy in the documentation is SSVD in spectral k-means was originally tested in standalone mode, and obviously the DistributedCache is not available in that case.

Updated the patch: actually used the new parameters.
                
      was (Author: magsol):
    Excellent points, thanks. Here's a new patch with the suggested fixes, let me know if that works.

The only reason I noticed the discrepancy in the documentation is SSVD in spectral k-means was originally tested in standalone mode, and obviously the DistributedCache is not available in that case.
                  
> Add SSVD option to SpectralKMeans
> ---------------------------------
>
>                 Key: MAHOUT-1159
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1159
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Clustering
>    Affects Versions: 0.8
>            Reporter: Shannon Quinn
>            Assignee: Shannon Quinn
>            Priority: Minor
>             Fix For: 0.8
>
>         Attachments: MAHOUT-1159.patch, MAHOUT-1159-ssvdopts.patch
>
>
> This adds SSVD as an option for eigensolver, in addition to the [default] Lanczos solver. Testing indicated it yielded similar clustering accuracy with a possible performance boost.
> This patch includes other small fixes, such as using the default "tempDir" for intermediate calculations.
> The initialization of the SSVD solver is a bit awkward, with specifying the number of reducers. I hard-coded this at 10; is there a better solution? Perhaps making it an optional parameter to the SSVD constructor?
> [Thanks to University of Pittsburgh CS undergraduates Andrew King, Pawan Solanki, and Philip Schinis for working on this.]

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