So in this paper, we use a much more robust algorithm, Hooke-Jeeves pattern search method, to solve the problem on the coarse grid, and the faster method: Polack-Ribiere conjugate gradient method or SSC gradient method on the finer grid.

• 故在本文中采用更为健壮的Hooke-Jeeves模式搜索法在粗网格上进行求解，得到一个较好的初值，然后再采用速度较快Polack-Ribiere共轭梯度法或不含线搜索的SSC梯度法在细网格上进行磨光，这样既保证了方法的收敛，又保证了速度。