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List:       jakarta-commons-dev
Subject:    [jira] [Commented] (MATH-867) CMAESOptimizer with bounds fits finely near lower bound and coarsely n
From:       "Gilles (JIRA)" <jira () apache ! org>
Date:       2012-09-29 22:34:07
Message-ID: 878403626.144093.1348958047941.JavaMail.jiratomcat () arcas
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    [ https://issues.apache.org/jira/browse/MATH-867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466345#comment-13466345 \
] 

Gilles commented on MATH-867:
-----------------------------

bq. did you correct the bug in the repair method that I proposed above?

Yes. There was some unnecessary fiddling because of asynchronous updates of this page \
and the email notifications of those updates...  
> CMAESOptimizer with bounds fits finely near lower bound and coarsely near upper \
>                 bound. 
> ---------------------------------------------------------------------------------------
>  
> Key: MATH-867
> URL: https://issues.apache.org/jira/browse/MATH-867
> Project: Commons Math
> Issue Type: Bug
> Reporter: Frank Hess
> Attachments: MATH867_patch, Math867Test.java
> 
> 
> When fitting with bounds, the CMAESOptimizer fits finely near the lower bound and \
> coarsely near the upper bound.  This is because it internally maps the fitted \
> parameter range into the interval [0,1].  The unit of least precision (ulp) between \
> floating point numbers is much smaller near zero than near one.  Thus, fits have \
> much better resolution near the lower bound (which is mapped to zero) than the \
> upper bound (which is mapped to one).  I will attach a example program to \
> demonstrate.

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