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From Dimitri Pourbaix <pourb...@astro.ulb.ac.be>
Subject [MATH] Comment on MATH-352
Date Wed, 10 Mar 2010 16:04:25 GMT
Hi,

I looked at the suggestion related to MATH-352 regarding the robustness of
the determination of the rank of the Jacobian in Levenberg-Marquardt.  It
does make sense indeed to replace ak2 == 0 with something more robust like
ak2<= treshold.  However, if one uses the epsilon machine for the threshold
as suggested, several tests in LevenbergMarquardtOptimizerTest and
MinipackTest fail.  Strange, is not it: usually it goes in the other way
round, when one becomes less strict, fewer tests fail.  Here, it is the
opposite.

Should one reassess some of these unit tests?

Dim.
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