running man2023在线观看韩剧网（RunningMapReduceExampleTFIDF hadoopclusternet This document describes how to run the TFIDF MapRed）

// inverse document frequency quotient between the number of docs in corpus and number of docs the // term appears Normalize the value in case the number of appearances is 0.double idf =Math.log10((double) numberOfDocumentsInCorpus /(double)((numberOfDocumentsInCorpusWhereKeyAppears ==0?1:0)+ numberOfDocumentsInCorpusWhereKeyAppears));