Lines Matching full:hessian
175 // The LBFGS hessian approximation is a low rank approximation to
176 // the inverse of the Hessian matrix. The rank of the
185 // 2. The Hessian approximation is constrained to be positive
202 // the initial inverse Hessian approximation is taken to be the Identity.
204 // chosen to approximate an eigenvalue of the true inverse Hessian can
584 // Hessian matrix's sparsity structure in a collection of
951 // indicates the rank of the Hessian approximation.
