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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-799) Remove default values for tolerances in "AbstractConvergenceChecker"
Date Sat, 22 Sep 2012 18:22:07 GMT

    [ https://issues.apache.org/jira/browse/MATH-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461235#comment-13461235
] 

Gilles commented on MATH-799:
-----------------------------

Work done for 3.1; issue will be finalized when preparing 4.0.

                
> Remove default values for tolerances in "AbstractConvergenceChecker"
> --------------------------------------------------------------------
>
>                 Key: MATH-799
>                 URL: https://issues.apache.org/jira/browse/MATH-799
>             Project: Commons Math
>          Issue Type: Task
>    Affects Versions: 3.0
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Trivial
>              Labels: api-change
>             Fix For: 4.0
>
>
> The custom convergence checkers let users override the ad-hoc convergence criteria that
most optimization algorithms provide.
> CM defines "simple" checkers that inherit from "AbstractConvergenceChecker" and use the
default values provided in that class. However good values for the tolerances are problem-dependent.
> User control cannot come without the user paying attention to those values, or "strange"
failures can happen (cf. issue MATH-798).
> It is thus proposed to remove the default values defined in "AbstractConvergenceChecker",
and also to remove the default (no-arg) constructor for all the convergence checkers defined
in CM, i.e.:
> * AbstractConvergenceChecker
> * SimpleValueChecker
> * SimpleUnivariateValueChecker
> * SimplePointChecker
> * SimpleVectorValueChecker
> In turn, this implies the removal of some of the constructors (which call the above constructors)
in the following classes:
> * SimplexOptimizer
> * BaseAbstractMultivariateOptimizer
> * BaseAbstractMultivariateVectorOptimizer
> * CMAESOptimizer
> * BaseAbstractMultivariateSimpleBoundsOptimizer
> * AbstractScalarDifferentiableOptimizer
> * GaussNewtonOptimizer
> * AbstractLeastSquaresOptimizer
> * NonLinearConjugateGradientOptimizer
> * LevenbergMarquardtOptimizer
> To maintain backwards-compatibility, the fields and constructors will be deprecated but
not removed until the preparation of release 4.0.

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