编写BP神经网络系统，可适应多节点输入输出的人工神经网络训练，即可以自由定义输入节点的个数，隐层节点个数，输出节点个数以及样本的个数。-Preparation of BP neural network system can be adapted to multi-node input and output of the artificial neural network training, that is free to define the number of input nodes, hidden layer node number, the number of output nodes and the number of samples.