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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.第四季的剧情会围绕变成吸血鬼的Elena展开。变身让她想起了和之前被Damen抹去的记忆，这会是她和Stefan的关系产生新的裂痕。附身到Tyler身上的klaus和Caroline之间到底有怎样的进展？真正的Tyler又去哪了呢？Elena在知道真相后又会有怎样的举动？而Jeremy面对变成吸血鬼的姐姐会有什么反应，Elena自己又如何接受这样的事实呢？上元节前夕，长安城混入可疑人员，身陷囹圄的张小敬临危受命，与少年天才李必携手在十二时辰内破除隐患。全篇运用了创新的探案剧集结构与人物关系设定，把故事嵌套在当时的世界文化中心城市长安这样一个完美的切入点。在展现跌宕紧凑的故事架构、反脸谱化的英雄人物、脑洞大开的细节设计同时，也带给观众丰富的文化价值。陈启耸耸肩说道：有跌才有涨。Chapter 31缉毒警察骆翔在五年前的卧底行动中遇难假死，五年后改名换姓，冒充曾经的自己打入贩毒集团，在追求真相与面对自身命运的道路上冲破黑暗……