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