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优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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Discord has soared in popularity in recent years, mainly as a place for online gamers, some of whom stream their gaming activities on other platforms like Twitch, to congregate, often anonymously.，更多细节参见服务器推荐
The legendary Pokémon known as Zapdos, Moltres, and Articuno, as well as others, are being added to the Pokémon United game.
习题链接：LeetCode 402. 移掉 K 位数字