Fix the build when CUDA is not present Change-Id: Ieaa483ce190ba917096c675f7ee731cb20d27bf2
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.