be sure that there's no name clash between NumericalDiff::df and the original functor df()
be sure that there's no name clash between NumericalDiff::df and the
original functor df()

pasuka/eigen,ritsu1228/eigen,pasuka/eigen,pasuka/eigen,pasuka/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,toastedcrumpets/eigen,TSC21/Eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen,ritsu1228/eigen,toastedcrumpets/eigen,Zefz/eigen,Zefz/eigen,TSC21/Eigen,Zefz/eigen,toastedcrumpets/eigen,Zefz/eigen