Remove an unused variable from gradient_checker.cc Change-Id: Ib2bfb3d1efacf197e14fa04ac18370d35060b322
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.