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if (n <= 1) return;
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。
"I feel honoured to be part of the team that can make a difference," says Squire, pictured with friend and colleague Pete Manning