Fix calculation of Solver::Summary::num_threads_used. - Previously we were only bounding num_threads_used based on whether CERES_NO_THREADS was defined, meaning that we could erroneously report a value larger than the number of threads actually used. Change-Id: I7373c0c968f9be268c8b7ab0b9561ae31700fda6
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.