中文说明：这是一个径向基函数神经网络，通过RBF网络的学习算法来逼近一个二维函数，并利用LMS算法来进行权值调整。
English Description：
This is a radial basis function neural network. The learning algorithm of RBF network is used to approximate a two-dimensional function, and the LMS algorithm is used to adjust the weight.