[modernize] Unify VariadicEvaluate using C++17 std::apply Change-Id: Iaf8ced8c2b937cb3c503e677adb96be32d6eace8
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.
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