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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-911) Remove usage of "DerivativeStructure" in the "optimization" package
Date Wed, 12 Dec 2012 17:56:20 GMT

    [ https://issues.apache.org/jira/browse/MATH-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530149#comment-13530149
] 

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

Shall we resolve this issue as "Won't Fix"?
                
> 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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