Lines Matching full:hessian
45 // Hessian at the k+1-th iteration, s_k = (x_{k+1} - x_{k}) and
46 // y_k = (grad_{k+1} - grad_{k}). As the approximated Hessian must be
60 // to update the Hessian approximation if:
66 // information in the Hessian. For example going from 1e-10 -> 1e-14 improves
139 // Rescale the initial inverse Hessian approximation (H_0) to be iteratively
140 // updated so that it is of similar 'size' to the true inverse Hessian along
151 // the true Hessian (not the inverse) along the most recent search direction
153 // inverse Hessian, and choosing: H_0 = I * \gamma will yield a starting
154 // point that has a similar scale to the true inverse Hessian. This
172 << approximate_eigenvalue_scale_ << " to initial inverse Hessian "
