RunningMapReduceExampleTFIDF - hadoop-clusternet - This document describes how to run the TF-IDF MapReduce example against ascii books. - This project is for those who wants to experiment hadoop as a skunkworks in a small cluster (1-10 nodes) - Google Pro

RunningMapReduceExampleTFIDF - hadoop-clusternet - This document describes how to run the TF-IDF MapReduce example against ascii books. - This project is for those who wants to experiment hadoop as a skunkworks in a small cluster (1-10 nodes) - Google Project Hosting

  // 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));