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Python机器学习实战之k-近邻算法的实现

2021-11-26 15:48:28 作者：顾道长生'

k-近邻算法采用测量不同特征值之间的距离方法进行分类。这篇文章主要为大家介绍了如何通过python实现K近邻算法，有需要的朋友可以借鉴参考下，希望能够有所帮助

K-近邻算法概述

简单地说, k-近邻算法采用测量不同特征值之间的距离方法进行分类。

k-近邻算法

优点：精度高、对异常值不敏感、无数据输入假定。
缺点: 计算复杂度高、空间复杂度高。

适用数据范围: 数值型和标称型。

工作原理

存在一个样本数据集合, 也称作训练样本集, 并且样本集中每个数据都存在标签, 知道样本集中每一数据与所属分类的对应关系。
输入没有标签的新数据后, 将新数据的每个特征与样本集中数据对应的特征进行比较, 然后算法提取样本集中特征最相似数据 (最近邻)的分类标签。
一般来说, 只选择样本数据集中前 k个最相似的数据, 这就是k-近邻算法中k的出处, 通常 k 是不大于 20 的整数。
最后, 选择 k个最相似数据中出现次数最多的分类, 作为新数据的分类。

k-近邻算法的一般流程

收集数据: 可以使用任何方法。
准备数据: 距离计算所需要的数值, 最好是结构化的数据格式。
分析数据: 可以使用任何方法。
训练算法: 此步骤不适用于 k-近邻算法。
测试算法: 计算错误率。
使用算法: 首先需要输入样本数据和结构化的输出结果, 然后运行 k-近邻算法判定输入数据分别属于哪个分类, 最后应用对计算出的分类执行后续的处理。

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]])

实施KNN算法

其伪代码如下:

对末知类别属性的数据集中的每个点依次执行以下操作:

计算已知类别数据集中的点与当前点之间的距离;
按照距离递增次序排序;
选取与当前点距离最小的k个点;
确定前k个点所在类别的出现频率;
返回前k个点出现频率最高的类别作为当前点的预测分类。

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：手写识别系统

数据集如下图：

示例: 使用k-近邻算法的手写识别系统

收集数据: 提供文本文件。
准备数据: 编写函数 classify0(), 将图像格式转换为分类器使用的list格式。
分析数据: 在Python命令提示符中检查数据, 确保它符合要求。
训练算法: 此步骤不适用于 k-近邻算法。
测试算法: 编写函数使用提供的部分数据集作为测试样本, 测试样本与非测试样本的区别在于测试样本是已经完成分类的数据, 如果预测分类与实际类别不同, 则标记为一个错误。
使用算法：本例没有完成此步骤，若你感兴趣可以构建完整的应用程序，从图像中提取数字, 并完成数字识别, 美国的邮件分栋系统就是一个实际运行的类似系统。

图像转换为向量

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
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
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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
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
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the classifier came back width: 6, the real answer is: 6
the classifier came back width: 3, the real answer is: 3
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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
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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
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
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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
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the classifier came back width: 9, the real answer is: 9
the classifier came back width: 6, the real answer is: 6
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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: 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: 5, the real answer is: 5
the classifier came back width: 0, the real answer is: 0
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the classifier came back width: 8, the real answer is: 8
the classifier came back width: 0, the real answer is: 0
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the classifier came back width: 8, the real answer is: 8
the classifier came back width: 0, the real answer is: 0
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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: 0, the real answer is: 0
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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: 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: 7, the real answer is: 7
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the classifier came back width: 9, the real answer is: 9
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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
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the classifier came back width: 9, the real answer is: 9
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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
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: 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
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the classifier came back width: 9, the real answer is: 9
the classifier came back width: 1, the real answer is: 1
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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: 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机器学习实战之k-近邻算法的实现的详细内容，更多关于Python k-近邻算法的资料请关注脚本之家其它相关文章！

Python机器学习实战之k-近邻算法的实现

K-近邻算法概述

工作原理

实施KNN算法

示例：手写识别系统

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