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A memo object is an object that stores a snapshot of the internal state of another object. The purpose of memo mode is to capture, externalize and store the state of an object without destroying the encapsulation, so that the object can be restored to the stored state at an appropriate time in the future.59岁的丹尼尔·布莱克是个木匠，由于心脏问题，他生平第一次需要申请社会救济。尽管他的医生禁止他继续工作，但他依然决定冒着被罚款的风险找一份工作。在他反复前往“就业中心”求职的过程中，他结识了凯蒂，一位需要照顾两个孩子的单身母亲。为了不让孩子流落到儿童福利院，她不得不住在一间离自己出生地450公里远的住房内。当今英国行政机构的繁琐程序就像一张网，牢牢套住两人。丹尼尔和凯蒂决定尝试相互帮助……《寻秦记》的书评区更是沸腾了，书友们网友们不停的发帖。老太太年纪大了，在黑莽原熬了几年，身子就不大好。消息传出，满城哗然。Name: Feng YouIt is easy to see that OvR only needs to train N classifiers, while OvO needs to train N (N-1)/2 classifiers, so the storage overhead and test time overhead of OvO are usually larger than OvR. However, in training, each classifier of OVR uses all training samples, while each classifier of OVO only uses samples of two classes. Therefore, when there are many classes, the training time cost of OVO is usually smaller than that of OVR. As for the prediction performance, it depends on the specific data distribution, which is similar in most cases.