PyTorch 官方教程，曾在官网上免费下载。全书短小精悍，只有5章内容，介绍了数据表示、自动求导、神经网络训练等方面的内容。
1 Introducing deep learning and the PyTorch library 1
2 It starts with a tensor 15
3 Real-world data representation with tensors 39
4 The mechanics of learning 67
5 Using a neural network to fit your data 101
