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https://issues.apache.org/jira/browse/MAHOUT-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779451#action_12779451
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Drew Farris commented on MAHOUT-165:
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{quote}
Awesome, thanks Drew. I noticed you didn't add a
{noformat}
<module>colt</module>
{noformat}
line inside of the top level pom, is this to hide it from being depended on? I
just ask because it meant that IntelliJ didn't seem to want to consider the
mahout-colt submodule to be a real maven submodule without that there.
{quote}
Jake, the module definition for colt is defined in the colt profile which
starts on line 111. This way, we won't build colt unless the colt profile is
activated using the -Pcolt argument on the command-line. I haven't switched to
IntelliJ yet, but I would be surprised if there were not some option to
activate certain profiles in the maven project configuration somewhere.
> Using better primitives hash for sparse vector for performance gains
> --------------------------------------------------------------------
>
> Key: MAHOUT-165
> URL: https://issues.apache.org/jira/browse/MAHOUT-165
> Project: Mahout
> Issue Type: Improvement
> Components: Matrix
> Affects Versions: 0.2
> Reporter: Shashikant Kore
> Assignee: Grant Ingersoll
> Fix For: 0.3
>
> Attachments: colt.jar, mahout-165-18nov-updated.patch,
> mahout-165-18nov.patch, mahout-165-trove.patch, MAHOUT-165-updated.patch,
> MAHOUT-165-with-colt-module.patch, MAHOUT-165-with-colt.patch,
> mahout-165.patch, MAHOUT-165.patch, mahout-165.patch
>
>
> In SparseVector, we need primitives hash map for index and values. The
> present implementation of this hash map is not as efficient as some of the
> other implementations in non-Apache projects.
> In an experiment, I found that, for get/set operations, the primitive hash of
> Colt performance an order of magnitude better than OrderedIntDoubleMapping.
> For iteration it is 2x slower, though.
> Using Colt in Sparsevector improved performance of canopy generation. For an
> experimental dataset, the current implementation takes 50 minutes. Using
> Colt, reduces this duration to 19-20 minutes. That's 60% reduction in the
> delay.
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