<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[bladelee的专栏]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/bladelee</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; bladelee]]></copyright><item><title><![CDATA[单变量线性回归－吴恩达机器学习课程lecture2]]></title><link>https://blog.youkuaiyun.com/bladelee/article/details/86410053</link><guid>https://blog.youkuaiyun.com/bladelee/article/details/86410053</guid><author>bladelee</author><pubDate>Sun, 13 Jan 2019 11:04:07 +0800</pubDate><description><![CDATA[几个关键概念：

假设函数 Hypothesis Function

h0(x)=Q0 + Q1*(xi, yi)

代价函数 Cost Function 是三维的等高线图

凸函数 Convex Function 

弓形函数只有一个全局最优解，没有局部最优解

求解凸函数的最优解 一般采用两种方法：

Batch梯度下降，是一种适合计算机求解的迭代算法

正规方程组解法，一种数学化方法

 ...]]></description><category></category></item><item><title><![CDATA[Linux 用户和组操作，以及文件和目录的基本权限]]></title><link>https://blog.youkuaiyun.com/bladelee/article/details/16993583</link><guid>https://blog.youkuaiyun.com/bladelee/article/details/16993583</guid><author>bladelee</author><pubDate>Wed, 27 Nov 2013 21:45:48 +0800</pubDate><description><![CDATA[个人阅读过认为有用的资源汇总帖：
Linux文件和目录访问权限设置
http://linux.chinaitlab.com/administer/38992.html



linux多用户管理（转载）

http://blog.youkuaiyun.com/wulong710/article/details/6666158]]></description><category></category></item><item><title><![CDATA[RTSP协议学习]]></title><link>https://blog.youkuaiyun.com/bladelee/article/details/9569931</link><guid>https://blog.youkuaiyun.com/bladelee/article/details/9569931</guid><author>bladelee</author><pubDate>Sun, 28 Jul 2013 21:40:30 +0800</pubDate><description><![CDATA[http://blog.youkuaiyun.com/perfectpdl/article/details/8654093



本文来自csdn lidp  http://blog.youkuaiyun.com/perfectpdl  转载注明出处，谢谢。





RTSP 协议为网络流媒体上的控制协议，与SIP,http 协议类似，都属于控制协议，并基于文本的，传输端口为 554，rtsp同样属]]></description><category></category></item><item><title><![CDATA[Git 命令的原理和使用方法]]></title><link>https://blog.youkuaiyun.com/bladelee/article/details/9569903</link><guid>https://blog.youkuaiyun.com/bladelee/article/details/9569903</guid><author>bladelee</author><pubDate>Sun, 28 Jul 2013 21:38:12 +0800</pubDate><description><![CDATA[图解Git
http://marklodato.github.io/visual-git-guide/index-zh-cn.html



Git架构和命令详细
http://itindex.net/detail/44092-git-%E6%9E%B6%E6%9E%84]]></description><category></category></item><item><title><![CDATA[Android主要包说明]]></title><link>https://blog.youkuaiyun.com/bladelee/article/details/9327589</link><guid>https://blog.youkuaiyun.com/bladelee/article/details/9327589</guid><author>bladelee</author><pubDate>Mon, 15 Jul 2013 00:18:50 +0800</pubDate><description><![CDATA[package android.app               内有两大组件activity和service，这两大组件都是间接从android.content.context继承来的。还有Fragment。
package android.content         内有Intent,ContentProvider，BoardcastReciever，以及重要的抽象类Context。]]></description><category></category></item><item><title><![CDATA[FreeSwitch 的Nat导致的呼叫不通的问题]]></title><link>https://blog.youkuaiyun.com/bladelee/article/details/9286849</link><guid>https://blog.youkuaiyun.com/bladelee/article/details/9286849</guid><author>bladelee</author><pubDate>Wed, 10 Jul 2013 06:47:02 +0800</pubDate><description><![CDATA[FreeSwitch 1.0.7 局域网环境下，终端1001呼叫1000，不通，有如下打印：
2013-07-10 05:33:32.889406 [DEBUG] switch_ivr_originate.c:1961 variable string 0 = [presence_id=1000@192.168.1.103]
2013-07-10 05:33:32.891806 [NOTICE]]]></description><category></category></item></channel></rss>