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.
- non-linear least squares problems with bounds constraints.
- general unconstrained optimization problems.
this package contains the documentation found on http://ceres-solver.org/ and the examples that were included with the release.