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161     // The LBFGS hessian approximation is a low rank approximation to
162 // the inverse of the Hessian matrix. The rank of the
171 // 2. The Hessian approximation is constrained to be positive
188 // the initial inverse Hessian approximation is taken to be the Identity.
190 // chosen to approximate an eigenvalue of the true inverse Hessian can
553 // Hessian matrix's sparsity structure in a collection of