The story starts with quantum field theory, which is incredibly complex, but the simplified version is that even empty space is filled with fields that could govern the interactions of any quantum objects in or near that space. You can think of different particles as energetic excitements of these fields—so a photon is simply an energetic state of the quantum field.
後來，高先生帶母親去醫院檢查，診斷發現她的脊柱關節移位。醫生解釋，長時間低頭看手機，頸椎和腰椎承受了超出承載能力的壓力。乾眼症、青光眼、頸椎病、肩周炎，這些原本要到八、九十歲才會集中出現的老年病，正在六、七十歲的「低齡老人」身上提前暴發。山東那位因熬夜刷手機導致一側眼睛近視度數飆升至2300度的70歲老太太，不過是這場健康危機中最極端的案例。
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激活函数的核心作用就是为神经网络引入非线性。