优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Thus, despite much effort, no gelling agent has yet been discovered that possesses all the properties and benefits of agar. Agar continues to be the best all-arounder: versatile, cheap, and established. And, if Gelidium agar should ever run out, and another colloid is not at hand, microbiologists could revert to culinary agar, which, although not as pure and transparent, offers a low-cost alternative to lab-grade agar.
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It's been weeks since their parents' passing, so the stab of loss is not as sharp. Instead, the twins get to enjoy the easy comfort of each other's company. Like Jeff and Emily, they share an aesthetic. But it's far from preppy; instead they favor leather jackets and streetwear with an aspirational sense of chill. Whether chatting in the car, getting a coffee, or looking over childhood photos, they are at ease. Where the other families all showed a need to perform for each other, these twins have a connection so deep that it predates birth. They swear that even over oceans, they can sense when the other is getting sick or getting high.
Екатерина Щербакова (ночной линейный редактор)