说明：  代码用于猫-非猫图片的二分类问题（附件内给出h5py格式的数据集），基于Pytorch神经网络工具包，采用比较经典的逻辑回归（Logistic Regression）算法。
(The code is used for the classification of cat or non-cat images (the data set in h5py format is given) . Based on the Pytorch neural network toolkit, the classical Logistic Regression algorithm is used.)