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From the defender's point of view, this type of attack has proved (so far) to be very problematic, because we do not have effective methods to defend against this type of attack. Fundamentally speaking, we do not have an effective way for DNN to produce good output for all inputs. It is very difficult for them to do so, because DNN performs nonlinear/nonconvex optimization in a very large space, and we have not taught them to learn generalized high-level representations. You can read Ian and Nicolas's in-depth articles (http://www.cleverhans.io/security/privacy/ml/2017/02/15/why-attaching-machine-learning-is-easier-than-defending-it.html) to learn more about this.三则，民众不受压迫，心甘情愿掏钱，觉得这是积攒功德。故事发生在麒麟艺术高中内，无数光彩夺目的明星们从这里起步，展开双翼追寻他们的梦想。然而，残酷的现实和巨大的经济压力使得学校的经营几乎瘫痪，老师们纷纷跳槽，前往其他的艺术学校，只有大大咧咧的杨真万（朴振英 饰）留了下来，和校长朱正万（全海孝 饰）一起为了维系学校的荣誉而努力奋斗着。申海星（姜索拉 饰）虽然歌艺平平，却对自己的音乐梦想十分执着。JB（林宰范 饰）的肩上所背负着的，不仅有自己的未来，还有父亲的期望。想要成为戛纳女王的莲（朴智妍 饰），整日里神神叨叨将音乐作为通灵媒介的朴顺童（刘小英 饰），这些善良开朗的年轻人们站在了擂台之上，一场激烈的音乐比赛正式拉开序幕。第一机械厂发生火灾，财会室烧死了四个人，工人的工资也全烧。共损失金额一百九十多万。消防队长发现有回火来到现场勘察，从墙里挖出弹头。根据弹道学原理，发现这并不是简单的火灾而是持枪抢劫大案。地面证据，死者位置都被变动了，从墙上弹痕判断，杀人凶手是两人，先灭口、后用炸弹焚屋炸毁现场，案发现场遭到两次破坏。police认为此案有许多疑点，对此案提出三个主要疑点，没有放入此案的案卷中，所以将不能作为合理翻案的最关键的证据重新调查还此案一个真相……今年是《相棒》诞生的第20年，杉下右京和他的搭档冠城亘会有怎么样精彩的表现呢？Create multiple instances representing different users and call the above two methods for each instance.