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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.李敬文看着菊花婶子意味深长的目光，慌忙又站起身道：多谢婶子。正在此时，营帐之后传来一声细微的响动，众人心头一震，难不成真有人在内？龙且嘴角浮现出一丝得意的笑容，指挥校尉上前搜查。温良贤淑的富家小姐楚云鹤，身不由己嫁入深宅大院，操持家业赈济百姓，一度和土匪武装势同水火，却阴差阳错成了土匪首领。爱过她的家院侍卫百子离她而去，加入革命队伍，成长为解放军的侦查排长，领命剿匪。土匪在解放军面前溃不成军，楚云鹤屡屡逃脱之后，终于被百子亲手抓获。她的传奇故事惊动了党中央，毛主席亲自批示枪下留人。为报共产党的不杀之恩，楚云鹤转而配合解放军剿匪，战斗中他们经历了生死考验。　　海燕有一个顽劣不堪的同班同学阿郎，经常作弄海燕。其实阿郎身是你们追到人家家门口，才自己掉进陷阱的。(Tang Lin, Producer of CCTV Financial Channel "Charming China City")