在深度学习中，有几类经典激活函数，每种都有自己的优缺点：
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Sam Rockwell stars as an otherwise unnamed man who shows up at a Norms diner in Los Angeles looking like a homeless person but claiming to be a time traveler from an apocalyptic future. He’s there to recruit the locals into his war against a rogue AI, although the diner patrons are understandably dubious about his sanity. (“I come from a nightmare apocalypse,” he assures the crowd about his grubby appearance. “This is the height of f*@ing fashion!”)
与苏联当局交恶后，塔可夫斯基愈发频繁地显露出自己脆弱、多愁善感的一面。对儿子的思念成为他日记中最持久的主题。1985年，流亡中的塔可夫斯基在瑞典哥特兰岛完成了《牺牲》的拍摄，这部作品他在影像上达到了前所未有的宗教和哲学寓言的强度：面对世界末日的到来，为了换回人类的一线生机，片中的主人公决意献出一切。在影片制作期间，塔可夫斯基被确诊身患肺癌。拍摄结束后，他前往巴黎入院治疗，病痛的折磨和对生命的思考，充斥于那段时间的日记。