优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
if (n <= 1) return;
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For now, the top hits on Vigloo are a drama, period action and risqué romance: "Miracle of the dirt-poor single mum," "Red Monster: Revenge against the devil," "The flat where tenants must do each other".
圖像加註文字，丹·麥肯齊說，他對「尋找最荒野地方」的熱愛把自己帶到了南極洲。Article InformationAuthor, 瑪麗盧·科斯塔（MaryLou Costa）