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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.擦了把泪，吸着鼻子问道：怎么不对？刘井儿道：我原以为他读了一肚子书，总该比我明白事理。现在也是无可奈何，也只能如此了，所谓有得必有失。My friend said that she really felt very tired.他们合作的剧目讲述的是一段大学校园爱情@www.jijiv.comJay ChouAh Qi's husband was finally fined a one-year commission (about 500,000 to 2 million), "which is a lesson." However, his classmates, who were vice-presidents in the investment and financing family, were directly arrested.