tree fa7bbecb527f6da586b0f5581b0c55f98f34cc1f
parent 0b5df70e33e7c9d64b3d9b90e21d1d1edd96e4a8
author Sameer Agarwal <sameeragarwal@google.com> 1353963358 -0800
committer Gerrit Code Review <noreply-gerritcodereview@google.com> 1354148281 -0800

Add a line search based minimizer.

1. Add a line search based minimization loop.
2. Currently this loop supports steepest descent and three
   kinds of non-linear conjugate gradient algorithms.
3. Update SolverImpl to talk to LineSearchMinimizer.
4. Update IterationCallback to carry information about
   line search.
5. Update LineSearch to take the initial point as input,
   saving on one function evaluation.
6. Updates to the external API.

Change-Id: I901a0e89fc948451ab34c743e70f3dec57c9405e