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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.冷酷，喜怒无常，刁钻蛮横，魔气四溢，动辄含笑毙人，削人手指如斩草絮……这样的人竟然是女主角。　　1941年，太平洋战争爆发前夕，国际反法西斯同盟特使秘密访华，召集国共双方地下情报组织代表，召开秘密会议，商讨双方在敌占区对日情报的工作配合。汪伪特务机关大肆布置抓捕行动，不料却意外扑空。与此同时，汪伪破获一军统情报站，通过对交通员的严刑逼供，得知密In an interview with the parents of Jiang Yang's expected primary school students, the students of the practice team heard a completely different voice from the school: the teacher's qualification was low, the teaching was not responsible, the children were allowed to cheat in exams in order to achieve results, the school had potential safety hazards, and junior high schools were set up at random... All kinds of problems surfaced. What kind of education do the students receive? Did school really follow the tenet of "everything for children"? The players were very worried.宋义问道：请恕宋某冒昧，尊府和先生本人身份实在好奇的紧，先生可否不吝赐教呢？范家和范文轲本人的行动着实诡异，战国时期，大商家与为政治合作，谋取大利益的比比皆是，这一点倒并不奇怪。