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该剧由艾里克斯·库兹曼([蜘蛛侠：英雄归来])自编自导，詹妮·吕美特([蕾切尔的婚礼])共同参与编剧，该剧根据1976年大卫·鲍伊主演的电影[天外来客]改编，故事以沃尔特·特维斯撰写的同名科幻小说为基础，讲述一个外星人在人类进化的转折点来到地球，他必须直面自己的过去以决定人类的未来Category division is specified through the Coding Matrix. There are many forms of coding matrix, the common ones are binary code and ternary code. The former specifies each class as a positive class and an inverse class respectively, while the latter can specify "disabled class" in addition to the positive and inverse classes. FIG. 3.5 shows a schematic diagram. In FIG. 3.5 (a), classifier f2 takes samples of Cl and C3 as positive examples and samples of C2 and C4 as counterexamples. In FIG. 3.5 (B), classifier f4 takes the samples of C1 and C4 as positive examples and the samples of C3 as counterexamples. In the decoding stage, the prediction results of each classifier are combined to form the code of the test example. The code is compared with the corresponding codes of various types, and the category corresponding to the code with the smallest distance is taken as the prediction result. For example, in Figure 3.5 (a), if based on the European distance, the prediction result will be C3.李sir（李修贤饰）是一名香港警察，为人公平正直。黑社会老大文叔（许绍雄饰）金盆洗手，退出了江湖，而接手的凯明却急于冒进，干了许多违法的事。李sir为了维护正义，开始追查凯明……我们做探子的，除了要眼耳通灵，还要善于记录，能写会画就更好了芝加哥警署第21辖区分为两个部分，包括直接打击犯罪的行动组和负责调查城市之中犯罪团伙的情报组。汉克（杰森·贝吉 Jason Beghe 饰）是情报组的组长，他嫉恶如仇，将打击犯罪当做自己义不容辞的首要任务，在他英明果断的决策下，许多穷凶极恶的犯罪分子一一落网。田夫子郁闷极了：既然来到学堂，有话就该问夫子，为何要回家问娘？香荽低下头，不停地扭着小手指，却把眼睛悄悄往上瞟，小声道：二姐姐说，要是问错了，让人笑话。段落三，讲述的是三个臭皮匠自娱自乐的故事。只有他们三个人，互相插科打诨，制造喜剧。