为什么需要非线性？ 想象一下，如果网络里每一层都是线性的（比如 y=Wx+b），无论堆叠多少层，最终网络都只是一条线性映射。深度堆叠就没有意义了，网络的表达能力非常有限。
(logging all transactions) or filling in pre-printed forms such as receipts
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Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
When they began walking again, they had a "bizarre" interaction with a man who thought they were lost as they were wearing coastal banners while walking in land-locked Shropshire.