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The following information was transferred from Weibo @ Mr. Lily's PolarisAlthough there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~如果有一天，那些你曾哀悼过并亲手埋葬过的亡者突然出现在你的门前，你会作何反应？如果他们声音相貌仍然和 去世前一模一样，仿佛年龄从来没有变老，你又会作何反应？这是奇迹还是疯狂？亦或……那根本就不是现实？居住在阿卡迪亚市（Arcadia）的人们就遇到了这种「亡者归来」的怪事，他们的生活从此被彻底改变。Join the army of chasing more. Although I have long been accustomed to paranormal, it is the first time I have seen this type of paranormal.16岁的Vivien被困在Vestalis学院，这是一所像监狱一样的寄宿学校，她对自己保持沉默，不为任何人伸出脖子。直到她和背叛她的前朋友索菲亚重聚。女孩们一起进行了一次危险的搜索，以发现监禁背后的可怕真相。很快，女孩们就要为自己的生命奔波，要么自救，要么就得努力死去。Demo Xia: I downloaded all the popular frameworks at present. I ran for the examples in different frames and looked at the results. I just thought it was good. Then I thought, well, in-depth learning is just like that. It's not too difficult. This kind of person, I met a lot during the interview, many students or just changed careers came up to talk about a demo, handwritten number recognition, CIFAR10 data image classification and so on, but you asked him how the specific process of handwritten number recognition was realized? Is the effect now good and can it be optimized? Why should the activation function choose this, can it choose another? Can you explain the principle of CNN briefly? I'm overwhelmed.