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AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:《微笑江湖》是由云南云视幻维数码影视有限公司拍摄制作的迷你剧集，其融合了电视剧的拍摄方式，栏目剧的操作模式，情景喜剧的喜剧元素，家庭幽默录像的短剧小情节剧情，成为观众茶余饭后的创新型娱乐解压节目。节目的特点主要体现在短剧情节的爆笑，每集为10分钟，由许多短小的喜剧情节组成，情节之间并没有任何的联系，每个情节都有一个笑点，其目的就是让观众解压、放松、娱乐。AI is in the current air outlet, so many people want to fish in troubled waters and get a piece of the action. However, many people may not even know what AI is. The connection and difference between AI, in-depth learning, machine learning, data mining and data analysis are also unclear. As a result, many training courses have sprung up, which cost a lot of money to teach demo and adjust the participants. They have taught you to study engineers quickly and deeply in one month, making a lot of money. We should abandon this kind of industry atmosphere! In my opinion, any AI training currently on the market is not worth attending! Don't give money to others, won't it hurt? -However, when everyone taught themselves, they did not know where to start. I got a lot of data, ran a lot of demo, reported a lot of cousera, adjusted the parameters, and looked at the good results of the model. I thought I had entered the door. Sorry, sorry, I spoke directly. Maybe you even sank the door. In my opinion, there are several levels of in-depth study of this area: (ignore the name you have chosen at random-)　　逃亡途中，他们不仅要对付各种各样令人棘手的突发事件，还要与追捕他们的执法官库利斗智斗勇。这个锲而不舍地家伙发誓要把这三个“脱网之鱼”送回监狱。这一路上意外不断，状况百出，究竟他们能否获得真正的自由？陈启点点头，对于这样的进度，他还是相当满意。As can be seen from the figure, the whole process is divided into 4 situations. The following will analyze these 4 situations in detail through practice, including why they are divided like this and how to classify and exclude other more situations.即便胜了，付出的代价也不在少。