基于神经网络算法，构建了一个三层的bp网络，用来识别5，6，7，8，9五个数字，在matlab环境下运行成功，对于了解神经网络控制算法很有帮助,并附有训练和测试数据-Based on neural network algorithm, to build a three-bp network, used to identify five digits 5,6,7,8,9, in the matlab environment running successfully, for the underst