commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-428) Simplify "DirectSearchOptimizer"
Date Fri, 22 Oct 2010 11:22:16 GMT

    [ https://issues.apache.org/jira/browse/MATH-428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923820#action_12923820
] 

Gilles commented on MATH-428:
-----------------------------

Is the convergence check (within the {{iterateSimplex}} of {{MultiDirectional}}) a safe-guard
to prevent infinite looping? I.e. can it happen that none of the preceding {{return}} statements
gets ever reached, whatever the number of iterations of the loop?
If so, maybe we could set a maximal number of iterations for that loop (a constructor parameter),
and let the optimizer check the convergence.


> Simplify "DirectSearchOptimizer"
> --------------------------------
>
>                 Key: MATH-428
>                 URL: https://issues.apache.org/jira/browse/MATH-428
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: opt_direct.tar.gz
>
>
> This issue refers to classes in package {{optimization.direct}}.
> Currently the class {{NelderMead}} inherits from {{DirectSearchOptimizer}}. However the
method {{doOptimize}} is implemented in {{DirectSearchOptimizer}}. This is backwards from
the intended design (where an "optimizer" is defined as a class that implements a specific
algorithm within {{doOptimize}}). According to this "terminology", {{DirectSearchOptimizer}}
is the optimizer whereas {{NelderMead}} could be considered as a specific way to construct
a simplex. Indeed, that's what seems intended since it overrides the abstract method {{iterateSimplex}}.
> I suggest to create 2 classes that will make it clear the separation between the "optimizer"
and the "simplex manager".

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message