Example usage for org.apache.mahout.cf.taste.impl.common InvertedRunningAverageAndStdDev InvertedRunningAverageAndStdDev

Introduction

In this page you can find the example usage for org.apache.mahout.cf.taste.impl.common InvertedRunningAverageAndStdDev InvertedRunningAverageAndStdDev.

Prototype

public InvertedRunningAverageAndStdDev(RunningAverageAndStdDev delegate) 

Source Link

Usage

From source file:net.ufida.info.mahout.common.MemoryDiffStorage.java

License:Apache License

@Override
public RunningAverage getDiff(long itemID1, long itemID2) {

    boolean inverted = false;
    if (itemID1 > itemID2) {
        inverted = true;/*from  ww w .ja  v  a2 s.c  o  m*/
        long temp = itemID1;
        itemID1 = itemID2;
        itemID2 = temp;
    }

    FastByIDMap<RunningAverage> level2Map;
    try {
        buildAverageDiffsLock.readLock().lock();
        level2Map = averageDiffs.get(itemID1);
    } finally {
        buildAverageDiffsLock.readLock().unlock();
    }
    RunningAverage average = null;
    if (level2Map != null) {
        average = level2Map.get(itemID2);
    }
    if (inverted) {
        if (average == null) {
            return null;
        }
        return stdDevWeighted ? new InvertedRunningAverageAndStdDev((RunningAverageAndStdDev) average)
                : new InvertedRunningAverage(average);
    } else {
        return average;
    }
}

---