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  • 大小: 38KB
    文件類型: .rar
    金幣: 1
    下載: 0 次
    發(fā)布日期: 2021-01-08
  • 語言: Python
  • 標簽: ID3??

資源簡介

ID3決策樹的Python代碼和相關(guān)的數(shù)據(jù)集

資源截圖

代碼片段和文件信息

#coding:utf-8

import?numpy
import?math
import?matplotlib.pyplot?as?plt
import?pre_processing

‘‘‘
決策樹的節(jié)點結(jié)構(gòu)
attrPos;整型,節(jié)點分枝屬性的下標,也就是作為父節(jié)點產(chǎn)生分枝所用的屬性
attrValue:字符串型,節(jié)點分枝屬性的值,也就是作為子節(jié)點從父節(jié)點分枝所對應(yīng)的屬性值
classLabel:字符串型,落入該節(jié)點的樣本中比例最高的類標簽
sons:list對象,保存當前節(jié)點的所有子節(jié)點
‘‘‘
class?Node?:
????attrPos?=?None
????attrValue?=?None
????classLabel?=?None
????def?__init__(self):
????????self.sons?=?[]

‘‘‘
函數(shù)功能:計算字典對象所有值的和
變量說明:
inputDict:輸入的字典對象
返回值說明:
返回字典對象所有值的和
‘‘‘
def?calcTotalValue(inputDict)?:
????return?numpy.array(inputDict.values()).sum()

‘‘‘
函數(shù)功能:計算當前節(jié)點的信息熵
變量說明:
classCount:字典對象,保存當前節(jié)點中各個類標簽的出現(xiàn)次數(shù)
返回值說明:
ent:float型,返回節(jié)點的信息熵
‘‘‘
def?calcEnt(classCount)?:
????ent?=?0.0
????
????#空字典,也就是沒有樣本落入當前節(jié)點
????if?classCount?==?{}?:
????????return?ent
????
????valueArray?=?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????299??2015-01-04?19:38??agaricus-lepiota\agaricus-lepiota-names.txt

?????文件??????12465??2014-12-29?19:19??agaricus-lepiota\agaricus-lepiota-test.data

?????文件?????361238??2014-12-29?19:19??agaricus-lepiota\agaricus-lepiota-train.data

?????文件????????384??2014-12-29?18:47??decision_tree\.project

?????文件????????593??2015-01-05?10:37??decision_tree\.pydevproject

?????文件????????179??2014-12-29?18:52??decision_tree\.settings\org.eclipse.core.resources.prefs

?????文件??????11104??2015-01-05?10:43??decision_tree\src\decision_tree\decision_tree.py

?????文件???????6558??2015-01-05?10:43??decision_tree\src\decision_tree\decision_tree.pyc

?????文件????????790??2015-01-05?10:43??decision_tree\src\decision_tree\main.py

?????文件????????463??2014-12-29?19:43??decision_tree\src\decision_tree\pre_processing.py

?????文件????????672??2014-12-30?10:36??decision_tree\src\decision_tree\pre_processing.pyc

?????目錄??????????0??2015-01-05?11:21??decision_tree\src\decision_tree

?????目錄??????????0??2015-01-05?11:21??decision_tree\.settings

?????目錄??????????0??2015-01-05?11:21??decision_tree\src

?????目錄??????????0??2015-01-05?11:22??agaricus-lepiota

?????目錄??????????0??2015-01-05?11:21??decision_tree

-----------?---------??----------?-----??----

???????????????394745????????????????????16


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