Remove unused ThreadTokenProvider classes ThreadTokenProvider and ScopedThreadToken are unused since ParallelInvoke passes thread IDs directly to worker tasks. Change-Id: If1c7c2671a7b621ec2dc453165c6eaccc9d8c1e5
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.