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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-655) General framework for iterative algorithms
Date Sat, 03 Sep 2011 15:38:10 GMT

    [ https://issues.apache.org/jira/browse/MATH-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096676#comment-13096676
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Luc Maisonobe commented on MATH-655:
------------------------------------

I think composition would be fine. Most probably, most immediate changes in ODE would be limited
to our own classes and not user classes. The changes in user classes could be dealt with progressively
if we deprecate an interface and set up other interfaces.

We have to be aware that the continuous output and events handling features in ODE are really
very important. But I think the proposed API improves things and suits our needs. I did not
try to go all the way and check it on real code, but I am confident it will be possible.

> General framework for iterative algorithms
> ------------------------------------------
>
>                 Key: MATH-655
>                 URL: https://issues.apache.org/jira/browse/MATH-655
>             Project: Commons Math
>          Issue Type: New Feature
>    Affects Versions: 3.0
>            Reporter: S├ębastien Brisard
>            Priority: Minor
>              Labels: algorithm, events
>         Attachments: iterative-algorithm.zip
>
>
> Following the thread [Monitoring iterative algorithms|http://mail-archives.apache.org/mod_mbox/commons-dev/201108.mbox/%3CCAGRH7HrgcgoBA=jcoKovjiQU=TjpQHnspBkOGNCu7oDdKk=K4w@mail.gmail.com%3E],
here is a first attempt at defining a general enough framework for iterative algorithms at
large. At the moment, the classes provide support for
> * maximum number of iterations
> * events handling
> ** initialization event (prior to entering the main loop),
> ** iteration event (after completion of one iteration),
> ** termination event (after termination of the main loop).
> These classes do not yet provide support for a stopping criterion.
> Some points worth to note
> * For the time being, the classes are part of the o.a.c.m.linear package.
> * For the time being, {{IterativeAlgorithm.incrementIterationCount()}} throws a {{TooManyEvaluationsException}}.
If the proposed new feature is integrated into CM, then a proper {{TooManyIterationsException}}
should be created, from which the former could derive.

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