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。
As gas lines started getting longer, states started rolling out odd-even license plate rationing, where the last digit of your plate determined which days you could buy gas. Odd numbers meant you bought on odd-numbered calendar days, even on even. Some states capped each purchase at $1 worth of fuel (about $8.47 today), translating to roughly four gallons. People made two or three of these rationing-day trips per week just to keep their tanks half full. If you forgot your day, you waited 48 hours, and hoped your station still had supply.。业内人士推荐吃瓜作为进阶阅读
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