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In reality, we often encounter multi-classification learning tasks. Some two-classification learning methods can be directly extended to multi-classification, but in more cases, we use two-classification learners to solve multi-classification problems based on some basic strategies. Therefore, the fundamental method of multi-classification problem is still the two-classification problem.(four) the validity period of the qualification certificate has not been renewed;于是，在大家的目瞪口呆下，华夫人蹦了起来。So when you call again, On the contrary, the shooting rate is not as good as before, It's been going on for almost three minutes, The comrades in the positions began to be "recruited" one after another. I saw with my own eyes a soldier stung on the temple by this big wasp, where the bone was thin and the poisonous needle of this big wasp was severe, so the needle directly penetrated the bone and plunged into the head. Outside the temple, I could also see the poisonous needle revealing a "tail" and the rest all plunged into the bone.一群大学生，他们敢于测试城市传说中的任何人，只要穿过一座幽灵般的桥——一个女人曾经在桥上自杀的地方——在m.77午夜密克罗尼西亚联邦会发现邪恶在等着他们。几位已婚男性好友，决心杀掉其中一位的“恶魔”妻子。沃德的太太，大家——包括沃德本人在内——一致公认，是个可恶的暴君，恶魔的化身。沃德的几位好友，在多次半开玩笑地谈话之后，制定了一个计划，打算要她的命——虽然实施过程有些意外，但磕磕绊绊终于成功了。下一步便是如何不留痕迹地处理掉尸体。虽然其中涉及谋杀、肢解等血淋淋的情节，但由于几位好友都是彻头彻尾的“外行”，整个过程却又诡异地笑料百出。Explain the template method mode, which means: in an abstract class, there is a main method, and then define 1... n methods, which can be abstract or actual methods, define a class, inherit the abstract class, override the abstract method, and realize the call to subclasses by calling the abstract class. First look at a diagram: