# 序列标注问题

<https://blog.csdn.net/malefactor/article/details/50725480>

所谓“序列标注”，就是说对于一个一维线性输入序列：

$$
x=x\_1,x\_2,...,x\_i,...,x\_n
$$

给线性序列中的每个元素打上标签集合中的某个标签

$$
y=y\_1,y\_2,...,y\_i,...,y\_n
$$

所以，其**本质上是对线性序列中每个元素根据上下文内容进行分类的问题**

分词问题：`跟着 Tfboys 学 左手 右手 一个 慢动作`

序列标注的任务就是给每个汉字打上一个标签，对于分词任务来说，我们可以定义标签集合为：

$$
LabelSet={B,M,E,S}
$$

其中**B代表这个汉字是词汇的开始字符，M代表这个汉字是词汇的中间字符，E代表这个汉字是词汇的结束字符，而S代表单字词**。

![](/files/-LqlOCaEJsT7aQ9S0w0d)

命名实体

![](/files/-LqlOCaGjTUHiEBb6F8a)


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