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Python機器學習實戰(zhàn)之k-近鄰算法的實現(xiàn)

 更新時間：2021年11月26日 15:51:32   作者：顧道長生'  
k-近鄰算法采用測量不同特征值之間的距離方法進行分類。這篇文章主要為大家介紹了如何通過python實現(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

簡單地說, k-近鄰算法采用測量不同特征值之間的距離方法進行分類。

k-近鄰算法

  • 優(yōu)點：精度高、對異常值不敏感、無數(shù)據(jù)輸入假定。
  • 缺點: 計算復雜度高、空間復雜度高。

適用數(shù)據(jù)范圍: 數(shù)值型和標稱型。

工作原理

  • 存在一個樣本數(shù)據(jù)集合, 也稱作訓練樣本集, 并且樣本集中每個數(shù)據(jù)都存在標簽, 知道樣本集中每一數(shù)據(jù)與所屬分類的對應關系。
  • 輸入沒有標簽的新數(shù)據(jù)后, 將新數(shù)據(jù)的每個特征與樣本集中數(shù)據(jù)對應的特征進行比較, 然后算法提取樣本集中特征最相似數(shù)據(jù) (最近鄰)的分類標簽。
  • 一般來說, 只選擇樣本數(shù)據(jù)集中前 k個最相似的數(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

  1. 收集數(shù)據(jù): 可以使用任何方法。
  2. 準備數(shù)據(jù): 距離計算所需要的數(shù)值, 最好是結(jié)構(gòu)化的數(shù)據(jù)格式。
  3. 分析數(shù)據(jù): 可以使用任何方法。
  4. 訓練算法: 此步驟不適用于 k-近鄰算法。
  5. 測試算法: 計算錯誤率。
  6. 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, 然后運行 k-近鄰算法判定輸 入數(shù)據(jù)分別屬于哪個分類, 最后應用對計算出的分類執(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]])

實施KNN算法

其偽代碼如下:

對末知類別屬性的數(shù)據(jù)集中的每個點依次執(zhí)行以下操作:

  1. 計算已知類別數(shù)據(jù)集中的點與當前點之間的距離;
  2. 按照距離遞增次序排序;
  3. 選取與當前點距離最小的k個點;
  4. 確定前k個點所在類別的出現(xiàn)頻率;
  5. 返回前k個點出現(xiàn)頻率最高的類別作為當前點的預測分類。
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-近鄰算法的手寫識別系統(tǒng)

  1. 收集數(shù)據(jù): 提供文本文件。
  2. 準備數(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。
  3. 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。
  4. 訓練算法: 此步驟不適用于 k-近鄰算法。
  5. 測試算法: 編寫函數(shù)使用提供的部分數(shù)據(jù)集作為測試樣本, 測試樣本與非測試樣本 的區(qū)別在于測試樣本是已經(jīng)完成分類的數(shù)據(jù), 如果預測分類與實際類別不同, 則標記 為一個錯誤。
  6. 使用算法：本例沒有完成此步驟，若你感興趣可以構(gòu)建完整的應用程序，從圖像中提 取數(shù)字, 并完成數(shù)字識別, 美國的郵件分棟系統(tǒng)就是一個實際運行的類似系統(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: 0, the real answer is: 0
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: 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: 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: 4, the real answer is: 4
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: 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: 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: 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, the real answer is: 5
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: 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: 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: 0, the real answer is: 0
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: 3, the real answer is: 3
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: 2, the real answer is: 2
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: 0, the real answer is: 0
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: 0, the real answer is: 0
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: 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: 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: 1, the real answer is: 1
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: 3, the real answer is: 3
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: 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: 1, the real answer is: 1
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: 7, the real answer is: 7
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: 7, the real answer is: 7
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: 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: 6, the real answer is: 6
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: 6, the real answer is: 6
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: 2, the real answer is: 2
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: 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 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: 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: 8, the real answer is: 8
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: 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: 2, the real answer is: 2
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: 5, the real answer is: 5
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: 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: 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: 2, the real answer is: 2
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: 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: 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: 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: 7, the real answer is: 7
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: 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: 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: 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: 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: 7, the real answer is: 7
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: 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: 5, the real answer is: 5
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: 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: 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: 9, the real answer is: 9
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: 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: 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: 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: 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: 1, the real answer is: 1
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: 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: 8, the real answer is: 8
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: 2, the real answer is: 2
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: 7, the real answer is: 7
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: 7, the real answer is: 7
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: 7, the real answer is: 7
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: 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: 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: 1, the real answer is: 1
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: 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: 2, the real answer is: 2
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: 4, the real answer is: 4
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: 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: 4, the real answer is: 4
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: 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: 1, the real answer is: 1
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: 1, the real answer is: 1
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: 6, 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: 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: 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: 7, the real answer is: 7
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: 4, the real answer is: 4
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: 5, the real answer is: 5
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: 7, the real answer is: 7
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: 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: 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
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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
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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
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the classifier came back width: 9, the real answer is: 9
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the classifier came back width: 1, the real answer is: 8
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the classifier came back width: 5, the real answer is: 5
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the classifier came back width: 9, the real answer is: 9
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the classifier came back width: 8, the real answer is: 8
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the classifier came back width: 1, the real answer is: 1
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the classifier came back width: 8, the real answer is: 8
the classifier came back width: 8, the real answer is: 8
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the classifier came back width: 9, the real answer is: 9
the classifier came back width: 8, the real answer is: 8
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the classifier came back width: 2, the real answer is: 2
the classifier came back width: 9, the real answer is: 9
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the classifier came back width: 7, the real answer is: 7
the classifier came back width: 7, the real answer is: 7
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the classifier came back width: 2, the real answer is: 2
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the classifier came back width: 5, the real answer is: 5
the classifier came back width: 1, the real answer is: 1
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the classifier came back width: 9, the real answer is: 9
the classifier came back width: 9, the real answer is: 9
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the classifier came back width: 8, the real answer is: 8
the classifier came back width: 1, the real answer is: 1
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the classifier came back width: 5, the real answer is: 5
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the classifier came back width: 8, the real answer is: 8
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the classifier came back width: 9, the real answer is: 9
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the classifier came back width: 7, the real answer is: 7
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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機器學習實戰(zhàn)之k-近鄰算法的實現(xiàn)的詳細內(nèi)容，更多關于Python k-近鄰算法的資料請關注腳本之家其它相關文章！

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