Local minimum found that satisfies the constraints.
Optimization completed because the objective function is non-decreasing in
feasible directions, to within the default value of the function tolerance,
and constraints are satisfied to within the default value of the constraint tolerance.
<stopping criteria details>
可以认为得到的局部极小值是最优解。
因为 Local minimum found that satisfies the constraints. 这句提示说明，已得到满足约束条件的局部极小值。
而 Optimization completed because the objective function is non-decreasing in
feasible directions, to within the default value of the function tolerance,
and constraints are satisfied to within the default value of the constraint tolerance. 这句也提示说明，由于目标函数不减少，优化完成。可行方向，在函数公差的默认值内，约束满足于约束容差的缺省值。