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System.out.println ("build the tree finished! ");Data Poisoning Attack: This involves inputting antagonistic training data into the classifier. The most common type of attack we observe is model skew. Attackers pollute training data in this way, making classifiers tilt to their preferences when classifying good data and bad data. The second attack we have observed in practice is feedback weaponization, which attempts to abuse the feedback mechanism to manipulate the system to misclassify good content as abuse (e.g. Competitor's content or part of retaliatory attacks).Although there are many unpredictable potential causes for new attacks, according to our experience, the following two events may trigger the occurrence of new attacks:On April 22, 2016, the State Administration of Press, Publication, Radio, Film and Television publicly announced the investigation of 15 media outlets, including Caijing magazine WeChat Public Number, for publishing false and untrue reports. Pointed out that:某国际知名专卖店里，前任店长刚调走，新店长尚未上任；在这“半自由无政府”状态下，店员杜紫藤与粉刷享受着可以天天上班迟到的生活；可另一店员苏爽爽却是截然不同的工作态度，每天早去晚回的忙里忙外，原来她是利用职务之便和小手段，亏空店里的钱赚取差价。这一天注定是苏爽爽倒霉的日子，新店长程鑫“微服出巡”，苏爽爽误认为是顾客，故伎重演利用VIP会员卡盗用公款，这事被程鑫当场戳穿，当场辞退了她，并正式接任了“店长”职务，杜紫藤和Francois两人大吃一惊。程鑫宣布要招一名男员工，紫藤与粉刷却暗地里怪招百出，准备搞砸“招工计划”，阴差阳错竟把过来买东西的朱葛给强招了进来。公司新开一家专卖店，拟在现有的专卖店里挑选一人为店长。这对朱葛、粉刷、紫藤来说，是一个机会。程鑫给他们每人一次代理店长的机会，以此挑选一个名额给公司调用。三人使出浑身解数当代理店长，但却没有把点子用在如何提高营销额上，而是借机整蛊对方，出难题对方以便自己能够胜出。三人体验了店长的滋味之后，都放弃了当店长的机会，选择和程鑫在一起，继续维