tree 0bc711f133fe2d83a30ad00c36abdcb644f0e2f3
parent a9d8ef847f643f9b7cf1270027d7c8744b5db585
author Sameer Agarwal <sameeragarwal@google.com> 1337024470 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1337024470 -0700

Add a lower bound on the regularization constant in LM.

In some cases the Levenberg-Marquardt can oscillate between,
two values of the regularizer mu. A small value which causes
the linear solver to fail and a higher value at which the solver
makes progress. This can cause significant wastage of solver
effort, and mu should just be clamped to some value.

This CL provides this setting as Solver::Options::min_mu,
and updates the documentation to reflect this.