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。
The average 30-year fixed mortgage rate has slipped to about 5.98%, its lowest level since September 2022.，这一点在搜狗输入法2026中也有详细论述
Last October the investment bank Goldman Sachs put out a report, which was widely cited, suggesting the US could be facing a new period of "jobless growth" thanks to the arrival of new technology and artificial intelligence (AI) in particular, allowing companies to do more with fewer workers.。爱思助手下载最新版本对此有专业解读
圖像來源，Getty Images
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