Convert calls to CHECK_NOTNULL to CHECK. CHECK_NOTNULL is being deprecated and removed from the glog library. Change-Id: I4a6d1eec6e82a768c7861c8f776bf1f9c0b50c74
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.