精细结构常数最令人迷惑的就是它的值恰好落在允许生命存在的极窄窗口内，至少目前来看，在实验误差范围内它没有随时间发生变化。
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The only part that was difficult to figure out initially was press emails. I get these from random companies all the time, and not all of them are in my contacts list. For this problem, the solution I came up with was similar to the one I used for junk emails above. I had the AI create a filter to sort any email that includes common press email words and phrases like “announce,” “launch,” and “embargo.” This filter required manual tuning over the course of a couple of weeks as more phrases and words were identified, but it has mostly worked well.
直观理解一下，激活函数就像神经网络里的开关或滤镜，它决定了每个神经元应该多大程度地激活，从而使网络具备强大的表达能力。