In all of our interactions, the DoW displayed a deep respect for safety and a desire to partner to achieve the best possible outcome.
engines, including Google, YouTube, Amazon, Bing, Yahoo, Yandex, and other
，这一点在safew官方版本下载中也有详细论述
for (int i = n - 1; i 0; i--) {
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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