I will attend a conference next week. That's my first in-person conference. So I prepare for the social activity during the conference. I collect ......

周五与女友和两位朋友一道，驱车前往波士顿。这是上半年就计划的行程，去看望一位朋友。

开了四五个小时，我们到了纽约境内。朋友L恰好要去曼哈顿看一位朋友，我们便在曼哈顿岛内，吃了一顿 local food。朋友Z随手从 lunch menu 上选了个steak，不想却等来一个大狮子头。大呼失策之......

When using PyTorch to train a neural network model, an important step is backpropagation like this:

loss = criterion(y_pred, y)

loss.backward()

......