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https://issues.apache.org/jira/browse/MAHOUT-768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182259#comment-13182259
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Grant Ingersoll commented on MAHOUT-768:
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bq. some require re-release of Mahout Collections (nah...)
Well, we are about to do a new release. Releasing a new Mahout Collections
would fit right in, so I don't see it as a big deal. Frankly, it seems to me
the need to manage Collections separately has largely proven to have been
premature. I'd suggest we just fold it back in to our main dev (although we
can keep the version number if we want)
> Duplicated DoubleFunction in mahout and mahout-collections (mahout.math
> package).
> ---------------------------------------------------------------------------------
>
> Key: MAHOUT-768
> URL: https://issues.apache.org/jira/browse/MAHOUT-768
> Project: Mahout
> Issue Type: Improvement
> Components: collections, Math
> Affects Versions: 0.5, collections-1.0
> Reporter: Dawid Weiss
> Assignee: Ted Dunning
> Priority: Minor
> Fix For: 0.6
>
>
> DoubleFunction is duplicated in Mahout Math and Collections. There are also
> other things inside m.math.* package that are kept there to avoid circular
> dependencies... Simply removing DoubleFunction from collections is not going
> to work because it is needed for compilation (again, circular dependency
> between collections and math). I see two solutions:
> 1) extract the common definitions inside math.function.* into a separate
> module. This is a clean solution, but obviously scatters the code even
> further.
> 2) create a compilation-time, optional dependency on mahout 0.5 in
> collections, remove the entire mahout.math.* subpackage from collections and
> live with this. I don't know how Maven handles circular dependencies of this
> type:
> collections [trunk] -> [optional, required at build time] mahout.math 0.5
> mahout.math [trunk] -> collections [trunk]
> it seems tricky and error-prone, but should also work.
> Looking for other ideas of cleaning this mess up, of course.
> Dawid
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