1. Remove constant_sparsity from LinearSolver::Options. It introduces
unnecessarily complexity in the structure of linear solvers and preconditioners.
This is the first step towards cleaning up the Preconditioner interface.
2. Minor tweaks and cleanups to the various linear solvers.
diff --git a/internal/ceres/schur_complement_solver_test.cc b/internal/ceres/schur_complement_solver_test.cc
index 16c4200..5e0cc40 100644
--- a/internal/ceres/schur_complement_solver_test.cc
+++ b/internal/ceres/schur_complement_solver_test.cc
@@ -65,8 +65,8 @@
sol_d.reset(new double[num_cols]);
LinearSolver::Options options;
- options.constant_sparsity = false;
options.type = DENSE_QR;
+
scoped_ptr<LinearSolver> qr(LinearSolver::Create(options));
TripletSparseMatrix triplet_A(A->num_rows(),
