Python機(jī)器學(xué)習(xí)實(shí)戰(zhàn)之k-近鄰算法的實(shí)現(xiàn)
更新時(shí)間：2021年11月26日 15:51:32 作者：顧道長(zhǎng)生'
k-近鄰算法采用測(cè)量不同特征值之間的距離方法進(jìn)行分類。這篇文章主要為大家介紹了如何通過python實(shí)現(xiàn)K近鄰算法，有需要的朋友可以借鑒參考下，希望能夠有所幫助
K-近鄰算法概述
簡(jiǎn)單地說, k-近鄰算法采用測(cè)量不同特征值之間的距離方法進(jìn)行分類。
k-近鄰算法
- 優(yōu)點(diǎn)：精度高、對(duì)異常值不敏感、無數(shù)據(jù)輸入假定。
- 缺點(diǎn): 計(jì)算復(fù)雜度高、空間復(fù)雜度高。
適用數(shù)據(jù)范圍: 數(shù)值型和標(biāo)稱型。
工作原理
- 存在一個(gè)樣本數(shù)據(jù)集合, 也稱作訓(xùn)練樣本集, 并且樣本集中每個(gè)數(shù)據(jù)都存在標(biāo)簽, 知道樣本集中每一數(shù)據(jù)與所屬分類的對(duì)應(yīng)關(guān)系。
- 輸入沒有標(biāo)簽的新數(shù)據(jù)后, 將新數(shù)據(jù)的每個(gè)特征與樣本集中數(shù)據(jù)對(duì)應(yīng)的特征進(jìn)行比較, 然后算法提取樣本集中特征最相似數(shù)據(jù) (最近鄰)的分類標(biāo)簽。
- 一般來說, 只選擇樣本數(shù)據(jù)集中前 k個(gè)最相似的數(shù)據(jù), 這就是k-近鄰算法中k的出處, 通常 k 是不大于 20 的整數(shù)。
- 最后, 選擇 k個(gè)最相似數(shù)據(jù)中出現(xiàn)次數(shù)最多的分類, 作為新數(shù)據(jù)的分類。
k-近鄰算法的一般流程
- 收集數(shù)據(jù): 可以使用任何方法。
- 準(zhǔn)備數(shù)據(jù): 距離計(jì)算所需要的數(shù)值, 最好是結(jié)構(gòu)化的數(shù)據(jù)格式。
- 分析數(shù)據(jù): 可以使用任何方法。
- 訓(xùn)練算法: 此步驟不適用于 k-近鄰算法。
- 測(cè)試算法: 計(jì)算錯(cuò)誤率。
- 使用算法: 首先需要輸入樣本數(shù)據(jù)和結(jié)構(gòu)化的輸出結(jié)果, 然后運(yùn)行 k-近鄰算法判定輸 入數(shù)據(jù)分別屬于哪個(gè)分類, 最后應(yīng)用對(duì)計(jì)算出的分類執(zhí)行后續(xù)的處理。
from numpy import * import operator
def createDataSet():
group = array([[1.0,1.1],[1.0,1.0],[0,0],[0,0.1]])
labels = ['A','A','B','B']
return group, labels
group, labels = createDataSet()
group
array([[1. , 1.1],
[1. , 1. ],
[0. , 0. ],
[0. , 0.1]])
labels
['A', 'A', 'B', 'B']
a = tile([3,3],(4,1)) a
array([[3, 3],
[3, 3],
[3, 3],
[3, 3]])
實(shí)施KNN算法
其偽代碼如下:
對(duì)末知類別屬性的數(shù)據(jù)集中的每個(gè)點(diǎn)依次執(zhí)行以下操作:
- 計(jì)算已知類別數(shù)據(jù)集中的點(diǎn)與當(dāng)前點(diǎn)之間的距離;
- 按照距離遞增次序排序;
- 選取與當(dāng)前點(diǎn)距離最小的k個(gè)點(diǎn);
- 確定前k個(gè)點(diǎn)所在類別的出現(xiàn)頻率;
- 返回前k個(gè)點(diǎn)出現(xiàn)頻率最高的類別作為當(dāng)前點(diǎn)的預(yù)測(cè)分類。
def classify0(inX, dataSet, labels, k):
dataSetSize = dataSet.shape[0]
diffMat = tile(inX,(dataSetSize,1)) - dataSet
sqDiffMat = diffMat**2
sqDistances = sqDiffMat.sum(axis=1)
distances = sqDistances**0.5
sortedDistIndicies = distances.argsort()
classCount = {}
for i in range(k):
voteIlabel = labels[sortedDistIndicies[i]]
classCount[voteIlabel] = classCount.get(voteIlabel,0) + 1
sortedClassCount = sorted(classCount.items(),key = operator.itemgetter(1), reverse=True)
return sortedClassCount[0][0]
classify0([0,0],group,labels,3)
'B'
示例：手寫識(shí)別系統(tǒng)
數(shù)據(jù)集如下圖：
示例: 使用k-近鄰算法的手寫識(shí)別系統(tǒng)
- 收集數(shù)據(jù): 提供文本文件。
- 準(zhǔn)備數(shù)據(jù): 編寫函數(shù) classify0(), 將圖像格式轉(zhuǎn)換為分類器使用的list格式。
- 分析數(shù)據(jù): 在Python命令提示符中檢查數(shù)據(jù), 確保它符合要求。
- 訓(xùn)練算法: 此步驟不適用于 k-近鄰算法。
- 測(cè)試算法: 編寫函數(shù)使用提供的部分?jǐn)?shù)據(jù)集作為測(cè)試樣本, 測(cè)試樣本與非測(cè)試樣本 的區(qū)別在于測(cè)試樣本是已經(jīng)完成分類的數(shù)據(jù), 如果預(yù)測(cè)分類與實(shí)際類別不同, 則標(biāo)記 為一個(gè)錯(cuò)誤。
- 使用算法：本例沒有完成此步驟，若你感興趣可以構(gòu)建完整的應(yīng)用程序，從圖像中提 取數(shù)字, 并完成數(shù)字識(shí)別, 美國(guó)的郵件分棟系統(tǒng)就是一個(gè)實(shí)際運(yùn)行的類似系統(tǒng)。
圖像轉(zhuǎn)換為向量?
def img2vector(filename):
returnVect = zeros((1,1024))
fr = open(filename)
for i in range(32):
lineStr = fr.readline()
for j in range(32):
returnVect[0,32*i+j] = int(lineStr[j])
return returnVect
testVector = img2vector('digits/testDigits/0_13.txt')
testVector[0,0:31]
array([0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1., 1., 1.,
1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.])
from os import listdir
def handwritingClassTest():
hwLables = []
trainingFileList = listdir('digits/trainingDigits')
m = len(trainingFileList)
trainingMat = zeros((m,1024))
for i in range(m):
fileNameStr = trainingFileList[i]
fileStr = fileNameStr.split('.')[0]
classNumStr = int(fileStr.split('_')[0])
hwLables.append(classNumStr)
trainingMat[i,:] = img2vector('digits/trainingDigits/%s' % fileNameStr)
testFileList = listdir('digits/testDigits')
errorCount = 0.0
mTest = len(testFileList)
for i in range(mTest):
fileNameStr = testFileList[i]
fileStr = fileNameStr.split('.')[0]
classNumStr = int(fileStr.split('_')[0])
vectorUnderTest = img2vector('digits/testDigits/%s' % fileNameStr)
classifierResult = classify0(vectorUnderTest, trainingMat,hwLables,3)
print("the classifier came back width: %d, the real answer is: %d" % (classifierResult,classNumStr))
if(classifierResult != classNumStr):
errorCount += 1.0
print("\nthe total number of errors is :%d" % errorCount)
print("\nthe total error rate is:%f" % (errorCount/float(mTest)))
handwritingClassTest()
the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 8 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 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classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, 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the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 8 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 7, the real answer is: 1 the classifier came back width: 7, the real answer is: 9 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 9 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 9, the real answer is: 3 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 7, the real answer is: 7 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 9, the real answer is: 9 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 6, the real answer is: 6 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 3, the real answer is: 3 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 1, the real answer is: 1 the classifier came back width: 2, the real answer is: 2 the classifier came back width: 8, the real answer is: 8 the classifier came back width: 4, the real answer is: 4 the classifier came back width: 0, the real answer is: 0 the classifier came back width: 5, the real answer is: 5 the classifier came back width: 8, the real answer is: 8 the total number of errors is :10 the total error rate is:0.010571
以上就是Python機(jī)器學(xué)習(xí)實(shí)戰(zhàn)之k-近鄰算法的實(shí)現(xiàn)的詳細(xì)內(nèi)容，更多關(guān)于Python k-近鄰算法的資料請(qǐng)關(guān)注腳本之家其它相關(guān)文章！
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