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From "Dawid Weiss (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-768) Duplicated DoubleFunction in mahout and mahout-collections (mahout.math package).
Date Sun, 24 Jul 2011 20:15:09 GMT


Dawid Weiss commented on MAHOUT-768:

Ah.. we may or may not. We currently use bits and pieces of math that don't require collections
at runtime (so we can exclude them in maven poms and not ship them at all). But you're right
in that if anything needs DoubleFunction then we'd be back in the same position anyway. Oh
well, up to you then -- I can live with the merge, although it's a size-heavy addition to
math and if it can be avoided, I'd be all for it.

> 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
>            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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