<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[lov_vol]]></title><description><![CDATA[好弱啊。。。。。。]]></description><link>https://blog.youkuaiyun.com/lov_vol</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; lov_vol]]></copyright><item><title><![CDATA[redishitft给用户添加权限]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/137860656</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/137860656</guid><author>lov_vol</author><pubDate>Wed, 17 Apr 2024 10:07:57 +0800</pubDate><description><![CDATA[在 Amazon Redshift 中，授予用户对某个模式的“读”权限涉及到授权用户查询该模式中所有表和视图的能力。由于 Redshift 没有直接授予模式的读权限的选项，你需要分别对每个表和视图授予权限。如果你有多个用户在该模式中创建表，你需要对每个用户分别设置默认权限。首先，你需要授予用户对模式的USAGE权限，这个权限让用户能够在模式中访问表和其他对象（但不包括表的内容）。最后，你可能需要定期检查并为新创建的表或视图授予权限，除非已经设置了合适的默认权限。]]></description><category></category></item><item><title><![CDATA[清理windows 防火墙出站规则]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/137120864</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/137120864</guid><author>lov_vol</author><pubDate>Thu, 28 Mar 2024 18:44:37 +0800</pubDate><description><![CDATA[【代码】清理windows 防火墙出站规则。]]></description><category></category></item><item><title><![CDATA[pg事务ID清理]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/137041871</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/137041871</guid><author>lov_vol</author><pubDate>Tue, 26 Mar 2024 11:54:11 +0800</pubDate><description><![CDATA[错误信息 “pq: database is not accepting commands to avoid wraparound data loss in database ‘postgres’” 指的是PostgreSQL遇到了事务ID（Transaction ID，简称TXID）的“事务ID包裹”（wraparound）问题。PostgreSQL通过定期的自动清理（autovacuum）机制来防止这个问题，该机制会清理“死”元组（dead tuples）并冻结旧的事务ID。]]></description><category></category></item><item><title><![CDATA[机器学习概述]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/132517026</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/132517026</guid><author>lov_vol</author><pubDate>Sat, 26 Aug 2023 23:50:42 +0800</pubDate><description><![CDATA[学习是要表示出系统中的变化 … 使得系统在下次进行同样的任务时变得更有效”   – Herbert Simon1956，达特茅斯会议，“人工智能之父” • 1975 年获得图灵奖1978年获的诺贝尔经济学奖1986年获得国家科学奖章1993年由于其心理学方面的杰出贡献被授予美国心理学会奖1994年他成为一名外籍中科院科学家“学习是对经验的表示方法的构造或修改”   --Ryszard S. Michalski。]]></description><category></category></item><item><title><![CDATA[基于实例的学习方法]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/132254243</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/132254243</guid><author>lov_vol</author><pubDate>Sat, 26 Aug 2023 14:19:34 +0800</pubDate><description><![CDATA[基本概念与最近邻方法K近邻方法基本算法讨论：更多距离度量；属性：归一化、加权；连续取值目标函数；k 的选择；打破平局；关于效率(K-Dtree的构建与查询)距离加权的KNN基于实例的学习器的四要素扩展：局部加权回归真实测试样例下的算法表现举例懒惰学习与贪婪学习。]]></description><category></category></item><item><title><![CDATA[贝叶斯学习]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/132125515</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/132125515</guid><author>lov_vol</author><pubDate>Sun, 06 Aug 2023 14:45:31 +0800</pubDate><description><![CDATA[贝叶斯定理用先验概率来推断后验概率MaxAPosteriorMAPhMAP，极大后验假设Max\ A\ Posterior, MAP, h_{MAP} ，极大后验假设MaxAPosteriorMAPhMAP​，极大后验假设MaximumLikelihoodMLhML极大似然假设Maximum Likelihood, ML, h_{ML}, 极大似然假设Maxim。]]></description><category></category></item><item><title><![CDATA[回归分析学习]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/132071355</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/132071355</guid><author>lov_vol</author><pubDate>Wed, 02 Aug 2023 22:50:04 +0800</pubDate><description><![CDATA[Regression回归分析是描述变量间关系的一种统计分析方法例：在线教育场景因变量Y：在线学习课程满意度自变量X：平台交互性、教学资源、课程设计前面提到过 西洋跳棋系统目标函数的设计也是一个回归问题预测性的建模技术，通常用于预测分析预测的结果多为连续值（但也可以是离散值，甚至是二值）回归分析：描述变量间关系的统计分析方法线性回归：最常用，基本假设基于误差平方和的损失函数最小二乘法梯度下降法扩展到多元线性回归相关系数与决定系数：相关 ≠ 因果。]]></description><category></category></item><item><title><![CDATA[决策树学习]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131886493</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131886493</guid><author>lov_vol</author><pubDate>Mon, 24 Jul 2023 21:54:40 +0800</pubDate><description><![CDATA[ΔIN。]]></description><category></category></item><item><title><![CDATA[机器学习方法与原则]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131876955</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131876955</guid><author>lov_vol</author><pubDate>Sun, 23 Jul 2023 21:18:01 +0800</pubDate><description><![CDATA[机器学习方法与原则
评价指标
TODO
训练集、验证集与测试集
训练集与测试集

训练集（作业）： 模型可见样本标签，用于训练模型，样本数量有限。

在训练集上表现好的模型， 在其它未见样本上一定表现好么？ 小心过拟合


未见样本（所有没做过的题）往往有指数级别或者无穷多个。测试集和训练集都属于未见样本。
测试集（考试）： 用于评估模型在可能出现的未见样本上的表现

尽可能与训练集互斥，即测试样本 尽量不在训练集中出现，主要估计泛化能力
估计模型在整个未见样本的表现



训练集与测试集的划分方式

随机]]></description><category></category></item><item><title><![CDATA[日常开发问题]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131846748</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131846748</guid><author>lov_vol</author><pubDate>Fri, 21 Jul 2023 10:39:30 +0800</pubDate><description><![CDATA[解决方案[https://blog.youkuaiyun.com/jiangbenchu/article/details/112955183]]]></description><category></category></item><item><title><![CDATA[每日英语2023/7/5-快乐只是我的伪装]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131566459</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131566459</guid><author>lov_vol</author><pubDate>Thu, 06 Jul 2023 08:40:34 +0800</pubDate><description><![CDATA[bad;badly;how come; be dying for sth;be dying to do sth; play it cool; not exactly; not really; be/get/keep in touch (with sb);be out of touch; lose touch;embarrassed;financially embarrassed;screw (sth.) up
]]></description><category></category></item><item><title><![CDATA[每日英语2023/7/5-No.相关内容]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131566202</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131566202</guid><author>lov_vol</author><pubDate>Thu, 06 Jul 2023 00:34:35 +0800</pubDate><description><![CDATA[number one;by numbers;a number of;numbers of]]></description><category></category></item><item><title><![CDATA[每日英语2023/7/4-后悔留长发]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131544365</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131544365</guid><author>lov_vol</author><pubDate>Tue, 04 Jul 2023 22:47:41 +0800</pubDate><description><![CDATA[in place;instead of;zip;zipper;fly;pull;on the one hand;on the other hand;tolerance]]></description><category></category></item><item><title><![CDATA[每日英语2023/7/4-描述生气]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131544027</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131544027</guid><author>lov_vol</author><pubDate>Tue, 04 Jul 2023 22:04:19 +0800</pubDate><description><![CDATA[be mad at; be mad about.]]></description><category></category></item><item><title><![CDATA[progreSQL基础]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131527011</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131527011</guid><author>lov_vol</author><pubDate>Tue, 04 Jul 2023 08:09:02 +0800</pubDate><description><![CDATA[还支持其他的通用功能的类型和丰富的几何类型。PostgreSQL中可以定制任意数量的用户定义数据类型。因而类型名并不是语法关键字，除了SQL标准要求支持的特例外。欢迎信息中列出了一些这种命令。数据库名必须以字母开头，并且长度小于63。缺省数据库名称是用户名。程序有一些不属于SQL命令的内部命令。它们以反斜线开头，“选项表示置于单步模式，它在向服务器发送每个语句之前暂停。PostgreSQL支持标准的SQL类型。默认数据库名是用户名。]]></description><category></category></item><item><title><![CDATA[每日英语2023/7/3-全员模仿海绵宝宝]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131524627</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131524627</guid><author>lov_vol</author><pubDate>Mon, 03 Jul 2023 22:39:46 +0800</pubDate><description><![CDATA[imitate sb;whoever;hold;still;cook;forget to do sth; forget doing sth; remember;remind sb sth;remind sb to do sth]]></description><category></category></item><item><title><![CDATA[每日英语2023/7/3-描述生气]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/131523749</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/131523749</guid><author>lov_vol</author><pubDate>Mon, 03 Jul 2023 22:01:17 +0800</pubDate><description><![CDATA[talk to sb; talk with sb. be angry with sb; be angry about sth. on the phone]]></description><category></category></item><item><title><![CDATA[算法题刷题记录]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/130811647</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/130811647</guid><author>lov_vol</author><pubDate>Mon, 22 May 2023 17:27:54 +0800</pubDate><description><![CDATA[摩尔投票算法

Leecode 229 多数元素 II


]]></description><category></category></item><item><title><![CDATA[利用yum安装时，报错 [Errno 256] No more mirrors to try]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/89742418</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/89742418</guid><author>lov_vol</author><pubDate>Thu, 02 May 2019 08:43:20 +0800</pubDate><description><![CDATA[利用yum安装时，报错 [Errno 256] No more mirrors to try解决方案：
解决方案：
[fitsh@localhost GuestAdditionsISO]$ yum clean all
[fitsh@localhost GuestAdditionsISO]$ yum makecache
然后再yum安装即可解决

...]]></description><category></category></item><item><title><![CDATA[2017计蒜客第五场比赛 UCloud 的安全秘钥（中等和困难） 双指针和随机哈希]]></title><link>https://blog.youkuaiyun.com/lov_vol/article/details/72862173</link><guid>https://blog.youkuaiyun.com/lov_vol/article/details/72862173</guid><author>lov_vol</author><pubDate>Sun, 04 Jun 2017 22:55:13 +0800</pubDate><description><![CDATA[每个 UCloud 用户会构造一个由数字序列组成的秘钥，用于对服务器进行各种操作。作为一家安全可信的云计算平台，秘钥的安全性至关重要。因此，UCloud 每年会对用户的秘钥进行安全性评估，具体的评估方法如下：
首先，定义两个由数字序列组成的秘钥 aaa
 和 bbb
近似匹配（≈\approx≈）
 的关系。aaa
 和 bbb
 近似匹配当且仅当同时满足以下两个条件：

∣a∣=]]></description><category></category></item></channel></rss>