Implementation of approximation using the MPI

可以利用拉格朗日插值方法解决多项式逼近问题-Lagrange interpolation method can be used to solve the problem of polynomial approximation

利用两层BP神经网络完成函数逼近。隐含层的激活函数取S型传输函数，输出层的激活函数取线性传输函数-Two layer BP neural network using function approximation. The S transfer function of the hidden layer activation function, the output layer activation function of linear transfer function