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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-911) Remove usage of "DerivativeStructure" in the "optimization" package
Date Sun, 09 Dec 2012 17:13:20 GMT

    [ https://issues.apache.org/jira/browse/MATH-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13527528#comment-13527528
] 

Gilles commented on MATH-911:
-----------------------------

Following the changes proposed in MATH-874, we could resolve this as "Won't fix": the current
code is backward-compatible, and *all* classes in
* o.a.c.m.optimization
* o.a.c.m.optimization.direct
* o.a.c.m.optimization.general
* o.a.c.m.optimization.univariate

are going to be deprecated (and replaced by those in package "o.a.c.m.optim", see MATH-874);
thus reverting codes that will deleted afterwards seems to be unnecessary work.

There is still the issue with the package
* o.a.c.m.optimization.fitting

Classes in that package also use "DerivativeStructure".
Is it necessary or required? If so, adapters will probably be needed when calls are made to
the new classes in package "o.a.c.m.optim" where all references to "DerivativeStructure" have
been removed.
If not necessary, then those classes have yet to be reverted to not use "DerivativeStructure".

                
> Remove usage of "DerivativeStructure" in the "optimization" package
> -------------------------------------------------------------------
>
>                 Key: MATH-911
>                 URL: https://issues.apache.org/jira/browse/MATH-911
>             Project: Commons Math
>          Issue Type: Task
>            Reporter: Gilles
>            Priority: Minor
>             Fix For: 3.1
>
>
> The "DerivativeStructure" class is not the proper interface towards user applications
that deal with optimization problems.
> Recent changes implies copying between e.g. the user's representation of a Jacobian and
the "DerviativeStructure" representation of the same data. And, actually, the current implementation
of "AbstractLeastSquaresOptimizer" copies back the "DerviativeStructure" representation into
a "double[][]" for internal use.
> [~kberlin] pointed out the potential storage inefficiencies in large-scale problems.

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