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Yang's Blog
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Yang's Blog
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Yang
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2025-12-21 02:41:51
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Yang's Blog Yang's Blog Stay hungry, Stay foolish, Stop when you are perfect. 主页 | Home 归档 | Archives 简介 | About Search Hello World By Yang 发表于 2019-05-25 Welcome to Hexo ! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub . Quick Start Create a new post 1 $ hexo new "My New Post" More info: Writing Run server 1 $ hexo server More info: Server Generate static files 1 $ hexo generate More info: Generating Deploy to remote sites 1 $ hexo deploy More info: Deployment 学习笔记 | Entropy By Yang 发表于 2018-12-31 Entropy 熵是一种衡量系统不确定的指标,量化出了信息的作用。 信息 一条信息的信息量与其不确定性有着很直接的关系。如果要搞清楚一件非常不确定的事情,那么就需要大量的信息。相反已经对一件事情非常了解,则不再需要太多信息就可以搞清楚,那么这样老看,一条信息的信息量就等于不确定性的多少。 香农用 “比特”(Bit)来度量信息量,一个比特是一个二进制数,计算机中,一个字节就是 ${8}$ 个比特。 一个事物内部会存有随机性,也就是不确定性,而从外部消除这个不确定性唯一的办法就是引入信息。 信息熵 香农提出的信息熵的形式如下,对于随机变量 ${X}...
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