2_4最近邻算法kNN(k_nearest_neighbor)——datingClassTest_2_4

声明：《机器学习实战》代码详细注释和重构，以及相关的函数、模块和算法的解释；本文为博主原创文章，未经博主允许不得转载。

1. 分类器针对约会网站的测试代码（程序清单2-4））
   *#代码：Peter Gong_shuai
   *#中文注释：Gong_shuai
   *#代码重构：Gong_shuai
   *#函数注解：Gong_shuai
   *#相关的函数、模块和算法的解释：Gong_shuai
   *#环境：Python2.7、Sublime Text3、mac

2. 代码

#coding=utf-8#分类器针对约会网站的测试代码（程序清单2-4）#源代码：Peter  Gong_shuai#中文注释：Gong_shuai#代码重构：Gong_shuai#函数注解：Gong_shuai#环境：python2.7from numpy import *import operatorfrom os import listdir #函数listdir可以列出给定目录的文件名#处理输入格式问题，输入为文件名字符串，输出为训练样本矩阵和类标签向量def file2matrix(filename):    fr = open(filename)    numberOfLines = len(fr.readlines())         #得到文本行数    returnMat = zeros((numberOfLines,3))        #创建以零填充的矩阵，为了简化，另外的一个维度设为3    classLabelVector = []                       #返回标签         fr = open(filename)    #解析文件数据到列表，循环处理文件中的每一行的数据    index = 0    for line in fr.readlines():        line = line.strip()    #截取掉所有的回车字符        listFromLine = line.split('\t')    #将整行数据分割成一个元素列表        returnMat[index,:] = listFromLine[0:3]     #选取前三个元素，存储到特征矩阵中        classLabelVector.append(int(listFromLine[-1]))        index += 1    return returnMat,classLabelVector#归一化特征值    def autoNorm(dataSet):    minVals = dataSet.min(0)#每一列的最小值    maxVals = dataSet.max(0)#每一列的最大值    ranges = maxVals - minVals    normDataSet = zeros(shape(dataSet))    m = dataSet.shape[0]#数组的大小      normDataSet = dataSet - tile(minVals, (m,1))#注意事项：特征值矩阵有1000*3个值。而minVals和range的值都为1*3.为了解决这个问题使用numpy中tile函数将变量内容复制成输入矩阵同样大小的矩阵      normDataSet = normDataSet/tile(ranges, (m,1))   #element wise divide矩阵除法    return normDataSet, ranges, minVals#k近邻算法def classify0(inX, dataSet, labels, k):#输入向量，输入的训练样本集，标签向量，选择最近邻的数目    #距离计算    dataSetSize = dataSet.shape[0]    diffMat = tile(inX, (dataSetSize,1)) - dataSet    sqDiffMat = diffMat**2    sqDistances = sqDiffMat.sum(axis=1)    distances = sqDistances**0.5    #选择距离最小的k个点    sortedDistIndicies = distances.argsort()         classCount={}              for i in range(k):        voteIlabel = labels[sortedDistIndicies[i]]        classCount[voteIlabel] = classCount.get(voteIlabel,0) + 1    #排序    sortedClassCount = sorted(classCount.iteritems(), key=operator.itemgetter(1), reverse=True)    return sortedClassCount[0][0]def datingClassTest():     #分类器针对约会网站的测试代码       hoRatio = 0.50          datingDataMat,datingLabels = file2matrix('datingTestSet2.txt')       #load data setfrom file    normMat, ranges, minVals = autoNorm(datingDataMat)    #计算测试向量的数量，此步决定哪些数据用于分类器的测试和训练样本    m = normMat.shape[0]    numTestVecs = int(m*hoRatio)    errorCount = 0.0    #计算错误率，并输出结果    for i in range(numTestVecs):        classifierResult = classify0(normMat[i,:],normMat[numTestVecs:m,:],datingLabels[numTestVecs:m],3)        print "the classifier came back with: %d, the real answer is: %d" % (classifierResult, datingLabels[i])        if (classifierResult != datingLabels[i]): errorCount += 1.0    print "the total error rate is: %f" % (errorCount/float(numTestVecs))    print errorCountdatingDataMat,datingLabels = file2matrix('datingTestSet2.txt')#读取文件数据datingClassTest()

1. 运行结果

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classifier came back with: 1, the real answer is: 1the classifier came back with: 2, the real answer is: 2the classifier came back with: 1, the real answer is: 1the classifier came back with: 2, the real answer is: 2the classifier came back with: 2, the real answer is: 2the classifier came back with: 2, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 2, the real answer is: 2the classifier came back with: 3, the real answer is: 3the classifier came back with: 1, the real answer is: 3the classifier came back with: 2, the real answer is: 2the classifier came back with: 2, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 2, the real answer is: 2the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 1, the real answer is: 1the classifier came back with: 2, the real answer is: 2the classifier came back with: 3, the real answer is: 3the classifier came back with: 2, the real answer is: 2the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 3, the real answer is: 3the classifier came back with: 2, the real answer is: 2the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 3, the real answer is: 3the classifier came back with: 1, the real answer is: 1the classifier came back with: 2, the real answer is: 1the classifier came back with: 2, the real answer is: 2the classifier came back with: 1, the real answer is: 1the classifier came back with: 1, the real answer is: 1the classifier came back with: 2, the real answer is: 2the total error rate is: 0.06400032.0[Finished in 0.5s]