Sameer Agarwal 54fcbf8938 Relax the requirements on loss functiond derivatives.
We now require that the first derivative of the loss function
be positive only if the second derivative is non-zero. This is
because when the second derivative is non-positive, we do not use
the second order correction suggested by BANS and instead use
a simpler first order strategy which does not use a division by
the gradient of the loss function.

Change-Id: I3d65713f152611998e196ff389a7081acfdfd8c1
2013-11-19 10:41:27 -08:00
2013-06-24 14:28:40 -07:00
2013-11-12 14:19:25 -08:00
2013-11-12 14:19:25 -08:00
2013-02-24 19:04:21 +00:00
2012-04-30 23:09:08 -07:00
2013-02-15 14:29:51 -08:00

Ceres Solver - A non-linear least squares minimizer
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