Фото: Евгений Биятов / РИА Новости
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
，这一点在heLLoword翻译官方下载中也有详细论述
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And, if a robot arm were to swing out towards you, for safety reasons you would want to be able to immediately stop it and push it back without harming yourself, reverse that motion instantly. For one thing, that requires a back-driveable actuator.