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It 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.
The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:
221. X.X.254
安桐哈哈一笑，很是受用。
No.7 Chen Weiting
只有如此，尹旭才能安心北上，了无牵挂。
张柏未作反应，只是伸衣袖擦拭着额上的汗水，心中暗道：笑吧。
沙僧，是整个取经团队中最没有存在感的一员，他承担着一路上最吃力不讨好的工作，是众人的出气筒、搬运工和替罪羊，他无人可说、无处可诉，只好将怨气都写在日记里，这本小小的《沙僧日记》记满了他的吐槽。
至于其他的诸侯，听说北方的彭城有一位西楚霸王项羽，可是他为人残暴，曾经坑杀过数十万降卒。
天启……云海燕咬牙切齿，牙缝中吐出两个字。
年近三十，收入平平的包子女田一心，最大的梦想就是嫁给未婚夫姜大伟，相夫教子，过平淡幸福的生活。但在结婚前夕，田一心和闺蜜艾玲玲在酒店当场抓到姜大伟出轨，原来姜大伟一直把她当成保姆，背后早就偷偷劈腿。田一心的婚事告吹。为了还婚房的贷款，田一心将房子出租，原本定好的白富美房客竟变成突然出现在她房间的半裸美男赵晓白！ 不仅如此，在不到三天的时间，田一心欠下赵晓白一千零三十万。为了偿还巨额欠款，田一心不得不和赵小白定下契约，答应他的一切无理要求……
该剧由Carell夫妇（《爆笑办公室》主演兼执行制片人Steve Carell和他的妻子Nancy）担任执行制片人，因此TBS非常爽快地买下了这个项目。该剧用讽刺的手法描述洛杉矶警署精英团队的故事——当这些聪明的警察团结一致追踪穷凶极恶的罪犯时，他们曝光了太多的私人信息。无论如何，不伸张正义他们决不罢休。有人说他们是一群「反直觉」的人，但这并不准确，事实上……他们根本没有直觉。
【以上内容为匿名字幕组翻译自Radio Times原文，转载请注明出处】
In-depth interviews in the upstream and downstream of the industrial chain have restored the impact of the melamine incident on China dairy in the past ten years from the overall situation, reflecting the author's good industry accumulation and breakthrough ability in interviews.
该剧讲述了一群以林山河与崔珍妍为首的高中时期好友，在十年后，为了帮助男主角夏拾走出因为女主角叶桑榆的意外而造成的心理创伤，通过一款体验游戏，将故事带回十年前的学生时代，在虚拟的游戏世界还原当年谜案的真相找回失去的友情故事。
正是这般难熬的时刻，著名导演崔东明邀请袁晶加盟自己的最新恐怖片《红花泪》。
