手写数码（0到9）识别的神经网络框架。附有数据训练集和测试集。采用随机梯度下降的BP算法。可以修改参数，加入drop out和动量法。-Digital handwriting (0 to 9) of the neural network recognition framework. With training and test data sets. BP algorithm using stochastic gradient descent. Parameters can be modified, added drop out and momentum method.