本文主要包含spark pagerank,spark pagerank算法,pagerank算法实现,python实现pagerank,pagerank算法java实现等服务器相关知识,网友希望可以进行参考
Spark下的PageRank实现，SparkPageRank实现
val sc = new SparkContext(...)
val links = sc.parallelize(Array(('A',Array('D')),('B',Array('A')),('C',Array('A','B')),('D',Array('A','C'))),2).map(x => (x._1,x._2)).cache()
var ranks = sc.parallelize(Array(('A',1.0),('B',1.0),('C',1.0),('D',1.0)),2)
val iterations_num = 50
for(i <- 1 to iterations_num){
val contribs = links.join(ranks,2).flatMap{
case(url,(links,rank)) => links.map(dest => (dest,rank/links,size))
}
ranks = contribs.reduceByKey(_ + _,2).mapValues(0.15 + 0.85 * _)
}
ranks.saveAsTextFile(...)