手工搭建三层神经网络分类器，在数据集[Fashion-MNIST](https:// github.com/zalandoresearch/fashion-mnist)上进行训练以实现图像分类。具体见：https://elearning.fudan.edu.cn/courses/74313/assignments/87031
打开demo.ipynb， 执行Training和Testing程序块即可。
layers.py 存放线性层和各种激活函数
loader.py 存放数据集loader
Loss.py 存放交叉熵损失函数
net.py 预设网络架构
optim.py 存放优化器，目前只有SGD
[1] Fashion-MNIST
[2] NN-by-Numpy
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