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https://issues.apache.org/jira/browse/MAHOUT-1159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600235#comment-13600235
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Dmitriy Lyubimov commented on MAHOUT-1159:
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bq. solveIt.setQ(0);
also.
the -q option is pretty important. It has a pretty dramatic effect on precision
and I feel that 0 should be used only if rough results are ok or the
computation of ABtJob becomes prohibitively costly. Are you sure you want to
ignore it? Perhaps it makes sense to expose it as a cli parameter too?
> 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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