K-Means聚类算法

本文主要是介绍K-Means聚类算法，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

from pyspark.sql import Row
from pyspark.ml.clustering import KMeans,KMeansModel
from pyspark.ml.linalg import Vectors

def f(x):
rel = {}
rel['features']=Vectors. \
dense(str(x[2]),str(x[24]),str(x[28]),str(x[29]))
rel['label'] = str(x[22])
return rel

data = spark.sparkContext.textFile("file:///home/hw17685187119/student2.txt").map(lambda line: line.split(';')).map(lambda p: Row(**f(p))).toDF()
kmeansmodel = KMeans().setK(3).setFeaturesCol('features').setPredictionCol('prediction').fit(data)

results = kmeansmodel.transform(data).collect()
for item in results:
print(str(item[0])+' is predcted as cluster'+ str(item[1]))

results2 = kmeansmodel.clusterCenters()
for item in results2:
print(item)

kmeansmodel.computeCost(data)

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