这是俺一个同学用反向传播算法编写的数字识别软件，识别率还是不错的-students with a back-propagation algorithm figures prepared by the recognition software to identify the rate is still pretty good

利用BP神经网络对邮件分类，2分类，实现反向传播算法细节，非直接函数调用(BP neural network is used to classify mail, 2 classifications, to implement the details of backpropagation algorithm, non direct function call.)

反向传播算法与利用卷积神经网络识别手写体(Back propagation algorithm and recognition of handwriting by using convolution neural network)