w测试最优化算法性能可通过其。
https://en.wikipedia.org/wiki/Rosenbrock_function
https://zh.wikipedia.org/wiki/Rosenbrock函数
In mathematical optimization, the Rosenbrock function is a non-convex function used as a performance test problem for optimization algorithms introduced by Howard H. Rosenbrock in 1960.[1] It is also known as Rosenbrock's valley or Rosenbrock's banana function.
The global minimum is inside a long, narrow, parabolic shaped flat valley. To find the valley is trivial. To converge to the global minimum, however, is difficult.
