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From "Dawid Weiss (Commented) (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-768) Duplicated DoubleFunction in mahout and mahout-collections (mahout.math package).
Date Mon, 26 Dec 2011 23:06:30 GMT


Dawid Weiss commented on MAHOUT-768:

We use it selectively and the parts that we do use don't rely on collections. Like I said,
this is not a crucial issue (we can exclude one of the duplicates manually), but I think it'd
be nice to remove the duplication nonetheless as it may be confusing.
> Duplicated DoubleFunction in mahout and mahout-collections (mahout.math package).
> ---------------------------------------------------------------------------------
>                 Key: MAHOUT-768
>                 URL:
>             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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