标签:creat reverse distance 文件名 range 打开 机器学习 mat 学习
最近在学习这本书,按照书上的实例编写了knn.py的文件,使用canopy进行编辑,用shell交互时发现运行时报错:
>>> kNN.classify0([0,0],group,labels,3) Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name ‘kNN‘ is not defined
运行的代码如下:
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 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.iteritems(), key=operator.itemgetter(1),reverse=True) return sortedClassCount[0][0]
然后我在canopy中重新关闭程序,又打开后,就可以运行成功了
import kNN group,labels=kNN.createDataSet() kNN.classify0([0,0],group,labels,3)
还有一点是文件名不识别大小写 需要注意
标签:creat reverse distance 文件名 range 打开 机器学习 mat 学习
原文地址:http://www.cnblogs.com/songjiaying/p/6155690.html