Duplicated DoubleFunction in mahout and mahout-collections (mahout.math
package).
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Key: MAHOUT-768
URL: https://issues.apache.org/jira/browse/MAHOUT-768
Project: Mahout
Issue Type: Improvement
Components: collections, Math
Affects Versions: collections-1.0, 0.5
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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