Drop use of POSIX M_PI Change-Id: I37342a366161bb13d6456ecc67569fe12705e05c
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.