中文说明：利用逻辑回归实现二分类的matlab程序。随机生成训练样本，利用梯度下降法进行训练，并且在样本图上画出了分类边界。
English Description：
The matlab program of binary classification is realized by using logistic regression. The training samples are randomly generated, and the gradient descent method is used for training, and the classification boundary is drawn on the sample graph.