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。
春节假期全国铁路发送旅客 1.21 亿人次，创历史新高
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Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
Active and passive voice checker