中文说明：
BP神经网络进行数据分类，是一种多层前馈神经网络，该网络的主要特点是信号前向传递，误差反向传播。运用梯度下降法。
English Description：
BP neural network for data classification is a multi-layer feedforward neural network. The main characteristics of the network are signal forward transmission and error back propagation. Gradient descent method was used