SVM，一个简单的用于线性分类的代码，采用openCV写的。-SVM, a simple linear classification code used by openCV written.

经典随机梯度下降SVM，一个简单易读的线性分类器代码，执行速度快，分类准确率也不错，适用于大规模图像分类。-The classic stochastic gradient descent SVM, a linear classifier code easier to read, faster execution speed, good classification accuracy, suitable for large-scale image classification.