close the file on return. See https://github.com/ceres-solver/ceres-solver/issues/425 Change-Id: I7d02a07d36608c25db191de31f47f19b33962040
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.