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。
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Features in Bullets:
She added: "If we adopted a more rational approach we could have the benefits of growth from AI, focus our attention on exporting the clean tech the rest of the world needs, and protecting nature here and abroad."