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Open the section "Definition and Classification of Gems" under the section "Overview of Gem Processing and Materials", Only in the video, associate professor Liao wangchun of the jewelry department of Jinling institute of science and technology explained: there are 45 varieties of natural gemstones, 32 varieties of natural jade, 9 kinds of available and national standard named organic gemstones, and the most important types of artificial gemstones are synthetic gemstones, artificial gemstones, pieced gemstones and recycled gemstones...A4.1. Visual function examination.Considering N categories C1, C2 …, CN, the basic idea of multi-classification learning is "disassembly method", that is, multi-classification tasks are disassembled into several two-classification tasks to solve. Specifically, the problem is split first, and then a classifier is trained for each split second classification task. During the test, the prediction results of these classifiers are integrated to obtain the final multi-classification results. The key here is how to split multiple classification tasks and how to integrate multiple classifiers.从越南战场上满身是伤归来的艾尔(尼古拉斯·凯奇饰)在医院里再一次看到了鸟孩，他像鸟一样蜷缩在墙角，目光呆滞地往着窗外的蓝天，不说一句话。他已经不再认识艾尔了，医生告诉艾尔，鸟孩如果依旧这个样子的话，将在3天后被送到疯人院。于是，艾尔的思绪飞到了若干年前……三年前，男主沈煜晨和女主莫染各自被陷害而一夜缠绵，却并不记得对方容貌。男主被拍照威胁，为了利益他谎称该女子是自己女友，要出国留学三年。三年后，迫于“寻妻”压力的男主因为女主的身影很像当初一夜情女子，于是和女主签订契约做了合约夫妻。女主原本也是有钱人家的小姐，因为被人陷害赶出家门，为了生计只能在横店跑龙套。恋爱脑总裁和熟女龙套的契约恋爱会如何展开呢？北宋初期，宋太宗赵匡胤面对内忧外患，招降北汉名将杨业 。杨业投奔大宋后为太宗立下汗马功劳，太宗赐其天波府，威望一时，却引起宋丞相潘仁美觊觎。太宗于是利用两臣子间的钩心斗角来稳固自己的王位，想不到因此使得杨家儿郎杨四郎与潘家女儿潘语嫣成了两家意气之争的牺牲品。趁着客人少的时候，又指挥伙计张灯结彩，布置店堂。