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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.张富，你不觉得有愧吗？张富被他冷冽的目光盯得倒退一步，一句辩解的话也说不出来。The moonlight slanted into the window and shone straight on the bed, making the darkness even more horrible. Stephen responded, confirmed the environment, and was shocked. He opened the portal and returned to the sanctuary.2008 年汶川地震时期，主董萧杨和自己的爱人天人永隔，引发了一个跨越十年的感人至深的爱情故事。这个信息让范文轲清楚地意识到自己还活着，想要活动手脚，却发现根本不能，略微一合计，他知道自己现在是被人捆绑着放在马车上。Syfy正式续订《魔法师》（The Magicians）第4季。在奔腾激越、云缠雾绕的怒江大峡谷，一个月黑风高的晚，土匪头子山豹爷带人洗劫了傈僳族人世代居住的地方傈僳山寨。傈僳族头人墨觉长老在撕杀中死于山豹爷的枪口下后，一枚象征着傈僳族头人权利的米斯牛头印章不翼而飞，值得庆幸的是，墨觉长老刚出生的女儿娜斯雨大难不死。