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));