overload linalg for SparseFloat op DenseDual

Author: alyst

src/dual.jl

@@ -817,7 +817,9 @@ end
 
 for MT in (StridedMatrix{<:LinearAlgebra.BlasFloat},
            LowerTriangular{<:LinearAlgebra.BlasFloat},
-           UpperTriangular{<:LinearAlgebra.BlasFloat})
+           UpperTriangular{<:LinearAlgebra.BlasFloat},
+           SparseMatrixCSC{<:LinearAlgebra.BlasFloat}
+           )
 
     @eval Base.:\(m::$MT, x::StridedMatrix{<:Dual}) =
         _map_dual_components!((y, x) -> ldiv!(y, m, x), (y, x, _) -> ldiv!(y, m, x), similar(x), x)