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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.The package is not large, but the express delivery list seems to have been defaced by some unknown liquid. A closer look shows that one can vaguely identify one's own name on the list, so......这变化有些太快了，日前两国还打的不可开交，怎么一转眼就开始和谈的。绝妙的遗产　　商人董大年曾遭遇土匪抢劫，得知刘和尚血洗马家，他与警察局联手，决心为民除害。Originated in Norway, it is related to people's hunting activities in winter and is a skiing and shooting competition. In 1960, the 8th Winter Olympics renamed this event Biathlon and listed it as an official competition. In 1992, women's competitions were added to the 16th Winter Olympics.