-
a
说明： 决策树(Decision Tree）是在已知各种情况发生概率的基础上，通过构成决策树来求取净现值的期望值大于等于零的概率，评价项目风险，判断其可行性的决策分析方法，是直观运用概率分析的一种图解法。由于这种决策分支画成图形很像一棵树的枝干，故称决策树。在机器学习中，决策树是一个预测模型，他代表的是对象属性与对象值之间的一种映射关系。Entropy = 系统的凌乱程度，使用算法ID3, C4.5和C5.0生成树算法使用熵。这一度量是基于信息学理论中熵的概念。
决策树是一种树形结构，其中每个内部节点表示一个属性上的测试，每个分支代表一个测试输出，每个叶节点代表一种类别。
分类树（决策树）是一种十分常用的分类方法。它是一种监督学习，所谓监督学习就是给定一堆样本，每个样本都有一组属性和一个类别，这些类别是事先确定的，那么通过学习得到一个分类器，这个分类器能够对新出现的对象给出正确的分类。这样的机器学习就被称之为监督学习。(Decision tree is a decision analysis method based on the known probability of occurrence of various situations, which can calculate the probability that the expected value of net present value is greater than or equal to zero, evaluate the project risk and judge its feasibility by constructing a decision tree. It is a graphic method of intuitively using probability analysis. Because this kind of decision branch is drawn as a graph, it is very similar to the branch of a tree, so it is called decision tree. In machine learning, decision tree is a prediction model, which represents a mapping relationship between object attributes and object values. Entropy = the disorder degree of the system, using algorithms ID3, C4.5 and C5.0, spanning tree algorithm using entropy. This measure is based on the concept of entropy in information theory.)
- 2021-02-01 15:02:09下载
- 积分：1
-
BelDST
DS证据推理的置信函数（bel）的计算函数，详细使用见该文件内的帮助说明(DS evidential reasoning confidence function (bel) calculation function, see the document in detail the use of the help that)
- 2007-09-09 21:31:33下载
- 积分：1
-
datamining
说明： 文档中集成了数据挖掘最常用的几种算法的Matlab源码,其中包括了Kmeans,KNN等算法的源码，希望能对大家有所帮助。(Document incorporates the most commonly used data mining algorithms for the Matlab source code, including Kmeans, KNN algorithms in source code, hoping to help.)
- 2010-04-26 00:52:02下载
- 积分：1
-
tezhengtiqu
脸部特征提取的论文，有效提高特征的选择准确性(new feature used in face recongise)
- 2012-04-21 15:29:25下载
- 积分：1
-
sinu_Max_closed_loop
硬件在环仿真电机矢量闭环控制Simulink模型，基于park、clack变换(Hardware in loop electrical motor close loop control)
- 2012-04-16 22:34:05下载
- 积分：1
-
sid2
《系统辨识与自适应控制》的所有源代码，欢迎下载，共享资源(the codes from a book about system identification and adaptive control)
- 2012-01-07 14:48:06下载
- 积分：1
-
genghing
包括压缩比、运行时间和计算复原图像的峰值信噪比,ML法能够很好的估计信号的信噪比,窗函数法设计一个数字带通FIR滤波器。( Including compression ratio, image restoration computing uptime and peak signal to noise ratio, ML estimation method can be a good signal to noise ratio, A window function design FIR digital band-pass filter.)
- 2016-11-16 16:34:57下载
- 积分：1
-
bp.train
一个不怕网络训练程序，适用于大专本科毕业设计，以及专业技术人员参考(One not afraid of network training procedures, apply to college graduate design, as well as professional and technical personnel reference)
- 2007-12-28 22:18:10下载
- 积分：1
-
Signals-Systems-and-Transforms-4E-by-charles-l
Signals Systems and Transforms 4E by charles l.Phillips John.M Parr Eve
- 2013-10-23 05:58:12下载
- 积分：1
-
tong1
同相中相环路，用于符号同步估计。采用simulink设计(PLL for bit/symbol synchronization )
- 2015-01-09 17:55:22下载
- 积分：1
