-
Notifications
You must be signed in to change notification settings - Fork 10
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
3c1a3dc
commit fa4e61f
Showing
6 changed files
with
28 additions
and
6 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,13 @@ | ||
## 信息熵和信息增益 | ||
|
||
[概念](https://www.cnblogs.com/fantasy01/p/4581803.html) | ||
|
||
1. 信息 | ||
信息是用来消除随机不确定性的东西 | ||
|
||
2. 熵 | ||
熵便是信息的期望值 | ||
熵是用来度量不确定性,当熵越大,概率说X=xi的不确定性越大,反之越小,在机器学期中分类中说,熵越大即这个类别的不确定性更大,反之越小 | ||
|
||
3. 信息增益 | ||
信息增益在决策树算法中是用来选择特征的指标,信息增益越大,则这个特征的选择性越好 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -26,4 +26,8 @@ | |
|
||
[一致性哈希算法](../14数据结构和算法/2一致性哈希算法.md) | ||
|
||
### HTTP-CACHE | ||
|
||
[varnish](http://varnish-cache.org/) 页面缓存 | ||
|
||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters