数据挖掘笔记-特征选择-算法实现-1_数据挖掘特征选择代码

关于特征选择相关的知识可以参考一下连接

数据挖掘笔记-特征选择-开方检验

数据挖掘笔记-特征选择-信息增益

数据挖掘笔记-特征选择-期望交叉熵

数据挖掘笔记-特征选择-互信息

数据挖掘笔记-特征选择-遗传算法

数据挖掘笔记-特征选择-整体汇总

项目源码里面包含Java和Python的实现，这里只列出Python实现：

代码托管:https://github.com/fighting-one-piece/repository-datamining.git

class Doc:
    
    def __init__(self, name):
        self._name = name
     
    def setName(self, name):
        self._name = name
    
    def getName(self):
        return self._name
    
    def setCategory(self, category):
        self._category = category
        
    def getCategory(self):
        return self._category
        
    def setWords(self, words):
        self._words = words
        
    def getWords(self):
        return self._words
    
    def setTfidfWords(self, tfidfWords):
        self._tfidfWords = tfidfWords
        
    def getTfidfWords(self):
        return self._tfidfWords
    
    def getSortedTfidfWords(self):
        results = [sorted(self._tfidfWords.items(), key=lambda i : i[1], reverse=True), ]
        return results
    
    def setCHIWords(self, chiWords):
        self._chiWords = chiWords
        
    def getCHIWords(self):
        return self._chiWords
 
    def setSimilarities(self, similarities):
        self._similarities = similarities
        
    def getSimilarities(self):
        return self._similarities

#文档操作工具类        
class DocHelper:
    
    #获取目录下所有的文档
    @staticmethod
    def genDocs(path):
        docs = []
        DocHelper.genDocsIterator(path, docs)
        return docs
    
    #遍历目录获取目录下所有的文档
    @staticmethod
    def genDocsIterator(path, docs):
        if os.path.isdir(path):
            for subPathName in os.listdir(path):
                subPath = os.path.join(path, subPathName)
                DocHelper.genDocsIterator(subPath, docs)
        else:
            name = path[path.rfind('\\') + 1 : path.rfind('.')]
            doc = Doc(name)
            doc.setCategory(path.split('\\')[-2])
            doc.setWords(WordUtils.splitFile(path));
            docs.append(doc)
    
    #文档中是否包含指定词
    @staticmethod
    def docHasWord(doc, word):
        for dword in doc.getWords():
            if dword == word:
                return True
        return False
    
    #文档中词频统计
    @staticmethod
    def docWordsStatistics(doc):
        map = {}
        for word in doc.getWords():
            count = map.get(word)
            if count is None:
                count = 0
            map[word] = co