<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[yan_dan的博客]]></title><description><![CDATA[坚持不过七天]]></description><link>https://blog.youkuaiyun.com/yan_dan</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; yan_dan]]></copyright><item><title><![CDATA[Spark RDD的Python使用全面介绍]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/103517124</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/103517124</guid><author>yan_dan</author><pubDate>Thu, 12 Dec 2019 21:15:51 +0800</pubDate><description><![CDATA[RDD(Resilient Distributed Dataset) 弹性分布式数据集
RDD的三种基本特性

Transformation 转换运算

一个RDD转换会产生另外一个RDD
转换操作时懒惰式的，就是说它不会立刻执行，它等到‘动作’运算才会实际执行


Action 动作运算

动作运算不会产生RDD，而是会产生数值、数值或者写入文件。(结果产生式运算)
动作运算会立刻被执行，并且会...]]></description><category></category></item><item><title><![CDATA[贝叶斯分类器一步步数学推导过程]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/103358132</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/103358132</guid><author>yan_dan</author><pubDate>Mon, 02 Dec 2019 22:04:20 +0800</pubDate><description><![CDATA[贝叶斯分类器推导过程

参考自我在课堂上学何老师的知识


1. 贝叶斯公式

贝叶斯公式的一般形式

P(A∣B)=P(A,B)P(B)⇔P(A,B)=P(B)P(A∣B)=P(A)P(B∣A)(1.1)
P(A|B)=\frac{P(A,B)}{P(B)}\Leftrightarrow P(A,B)=P(B)P(A|B)=P(A)P(B|A) \tag{1.1}
P(A∣B)=P(B)P(A,...]]></description><category></category></item><item><title><![CDATA[逻辑回归及其梯度下降法优化的详细推导过程和实现代码]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/103335527</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/103335527</guid><author>yan_dan</author><pubDate>Sun, 01 Dec 2019 15:29:24 +0800</pubDate><description><![CDATA[Logistic Regression 逻辑回归

参考李航《统计学习方法》第六章

1. Logistic distribution
逻辑斯蒂分布，主要就是逻辑斯蒂分布函数F。因为其函数值在[0, 1]之间，符合概率的分布特点，良好的对称性也是选择它的一个原因。
一般的逻辑斯蒂分布函数如下：
F(x)=11+e−(x−μ)/γ(1.1) F(x)= \frac{1}{1+e^{-(x-\mu)/...]]></description><category></category></item><item><title><![CDATA[Ubuntu Linux下vim输入键盘功能区布局错误，方向键问题]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/88832793</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/88832793</guid><author>yan_dan</author><pubDate>Tue, 26 Mar 2019 23:00:18 +0800</pubDate><description><![CDATA[参考链接：https://www.cnblogs.com/donaldworld/p/6815524.html



在Ubuntu中，进入vim命令发现方向键会输出ABCD，退格键也不行。是因为Ubuntu装的是vim-tiny，我们要的是vim-full。所以我们要卸载重装vim。

1.卸载


sudo apt-get remove vim-common

2.安装


sudo apt...]]></description><category></category></item><item><title><![CDATA[Linux常用命令思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/88410653</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/88410653</guid><author>yan_dan</author><pubDate>Mon, 11 Mar 2019 21:44:21 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[Servlet思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/88255969</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/88255969</guid><author>yan_dan</author><pubDate>Wed, 06 Mar 2019 21:00:53 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[HTTP协议思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/88052021</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/88052021</guid><author>yan_dan</author><pubDate>Fri, 01 Mar 2019 11:17:39 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[Tomcat思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/88051283</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/88051283</guid><author>yan_dan</author><pubDate>Fri, 01 Mar 2019 10:58:30 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[Java基础加强类]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/88016565</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/88016565</guid><author>yan_dan</author><pubDate>Thu, 28 Feb 2019 10:30:11 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[eclipse常用快捷键和debug常用单词释义]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87975431</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87975431</guid><author>yan_dan</author><pubDate>Wed, 27 Feb 2019 15:48:44 +0800</pubDate><description><![CDATA[1.eclipse常用快捷键

alt + / ：内容补全（导入jar包）
	alt + 上下方向键：光标所在行上下行走
	ctrl + d ：删除一行
	ctrl + 1 ：提示错误的修复操作选项
	atrl + shift + / ：注释选中的多行
	atrl + shift + \ ：取消选中多行的注释
	atrl + shift + o ：导入包或者去掉多余的包
	atrl + shift...]]></description><category></category></item><item><title><![CDATA[基于W3C的JSON学习总结]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87969778</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87969778</guid><author>yan_dan</author><pubDate>Wed, 27 Feb 2019 11:56:19 +0800</pubDate><description><![CDATA[1. json == JavaScript Object Notation

2.json 优势在于比xml更小 更快 更容易解析

3. json语法思路比较简单，基础是键值对 (key:value)，然后结合中括号（ [] ）并列为数组，大括号（ {} ）包裹为json对象。然后通过嵌套形成复杂的层次结构去描述数据形式。

4.语法规则

基础数据在名称/值对中  &amp;gt;&amp;gt;&amp;gt; k...]]></description><category></category></item><item><title><![CDATA[XML解析方式总结 SAX编程 DOM4J编程]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87938501</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87938501</guid><author>yan_dan</author><pubDate>Wed, 27 Feb 2019 11:28:58 +0800</pubDate><description><![CDATA[                                                         思维导图大纲



1.DOM解析和SAX解析的区别是 DOM解析是把文档全部加载进去内容，形成树状结构，可以做增删改操作，但是容易产生内存溢出，SAX解析边读边解析，基于事件驱动，查询速度快，但是不能做增删改操作。

2.JAXP是jdk中方法，但是dom4j是比较常用的jar包

...]]></description><category></category></item><item><title><![CDATA[xml思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87932471</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87932471</guid><author>yan_dan</author><pubDate>Tue, 26 Feb 2019 11:57:42 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[eclipse new 自定义添加自己常用文件]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87907807</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87907807</guid><author>yan_dan</author><pubDate>Sun, 24 Feb 2019 21:15:51 +0800</pubDate><description><![CDATA[设置路径是 Window 【窗口】 &amp;gt; Customize Perspective 【自定义视图】  &amp;gt; Shortcuts 【快捷方式】 &amp;gt;  选择 &quot;New&quot; 

]]></description><category></category></item><item><title><![CDATA[jquery 简介]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87864935</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87864935</guid><author>yan_dan</author><pubDate>Thu, 21 Feb 2019 17:20:38 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[JavaScript思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87785941</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87785941</guid><author>yan_dan</author><pubDate>Wed, 20 Feb 2019 11:53:34 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[HTML思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87563176</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87563176</guid><author>yan_dan</author><pubDate>Sun, 17 Feb 2019 22:35:29 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[CSS思维导图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/87560947</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/87560947</guid><author>yan_dan</author><pubDate>Sun, 17 Feb 2019 22:00:17 +0800</pubDate><description><![CDATA[

 ]]></description><category></category></item><item><title><![CDATA[Python matplotlib.pyplot 画图]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/86563393</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/86563393</guid><author>yan_dan</author><pubDate>Sun, 20 Jan 2019 17:02:08 +0800</pubDate><description><![CDATA[
import matplotlib.pyplot as plt
import numpy as np
# x y 是list类型
x = np.linspace(-1, 1, 50)
y1 = 2*x +1
y2 = x**2
#到下一个plt.figure()之前都是属于这张图的
plt.figure(num=3,figsize = (8,5))
#以x为横坐标 y为纵坐标作图
plt.plo...]]></description><category></category></item><item><title><![CDATA[Tensorflow常用运算]]></title><link>https://blog.youkuaiyun.com/yan_dan/article/details/86556970</link><guid>https://blog.youkuaiyun.com/yan_dan/article/details/86556970</guid><author>yan_dan</author><pubDate>Sat, 19 Jan 2019 23:01:20 +0800</pubDate><description><![CDATA[1. + - * / 都是对应位置元素进行加减乘除，两个tensor具有相同的shape形状。


&amp;gt;&amp;gt;&amp;gt; v1 = tf.constant([1.,2.,3.])
&amp;gt;&amp;gt;&amp;gt; v2 = tf.constant([2.,2.,3.])
&amp;gt;&amp;gt;&amp;gt; print(sess.run(v1 - v2))
[-1.  0.  0.]
&amp;gt;&amp;gt;&amp;gt; p...]]></description><category></category></item></channel></rss>