激活函数的核心作用就是为神经网络引入非线性。
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「我覺得就像每一個進入中國的外國人一樣，因為我喜歡攝影，我很喜歡在中國拍攝辛苦的勞工、地攤市場上的毛澤東畫像、紅色五角星，我得說我覺得我趕在『成為中國人』這個潮流走紅之前就在學習『成為中國人』，」安迪這樣告訴BBC中文，打趣稱在他回國後，很多朋友都問他是否有成為「黨員」、打算作為「間諜」效忠北京。
"But the Democrats stayed seated almost the entire night, and you could tell it started to get under Trump's skin," she continued, showing footage of Trump being outwardly angry at seated members of Congress. "Mr President, I will have you know that the Democrats are not standing because they are outraged by your tyranny and lawless behavior, and also they are asleep right now. Shhhhh!"，更多细节参见91视频