中文说明：
采用动量梯度下降算法训练BP网络，采用两种训练方法，即 L-M 优化算法（trainlm）和贝叶斯正则化算法（trainbr），用以训练 BP 网络。
English Description：
The momentum gradient descent algorithm is used to train BP network, and two training methods, namely L-M optimization algorithm (trainlm) and Bayesian regularization algorithm (trainbr), are used to train BP network.