Example usage for org.apache.hadoop.io DoubleWritable DoubleWritable

Introduction

In this page you can find the example usage for org.apache.hadoop.io DoubleWritable DoubleWritable.

Prototype

public DoubleWritable(double value)

Source Link

Usage

From source file:org.apache.giraph.ranking.LinkRank.TrustRankVertexMasterCompute.java

License:Apache License

@Override
public void compute() {
    // add additional 3 steps for normalization.
    long maxSteps = getContext().getConfiguration().getLong(TrustRankComputation.SUPERSTEP_COUNT, 10) + 3;
    long superstep = getSuperstep();
    if (superstep == maxSteps - 2) {
        /**/*w  w  w. ja va 2s .co  m*/
         * We should have log values of the scores aggregated in SUM_OF_LOGS.
         * Divide this sum by total number of vertices and aggragate in
         * AVG_OF_LOGS.
         */
        DoubleWritable logsum = getAggregatedValue(TrustRankComputation.SUM_OF_LOGS);
        DoubleWritable avg = new DoubleWritable(logsum.get() / getTotalNumVertices());

        setAggregatedValue(TrustRankComputation.AVG_OF_LOGS, avg);

    } else if (superstep == maxSteps) {
        /**
         * Calculate standart deviation with deviation sums SUM_OF_DEVS.
         * Aggregate result to STDEV.
         */
        DoubleWritable devSum = getAggregatedValue(TrustRankComputation.SUM_OF_DEVS);
        double ratio = devSum.get() / getTotalNumVertices();
        DoubleWritable stdev = new DoubleWritable(Math.sqrt(ratio));
        setAggregatedValue(TrustRankComputation.STDEV, stdev);
    }

}

From source file:org.apache.giraph.types.ops.DoubleTypeOps.java

License:Apache License

@Override
public DoubleWritable createCopy(DoubleWritable from) {
    return new DoubleWritable(from.get());
}

From source file:org.apache.giraph.writable.kryo.DirectWritableSerializerCopyTest.java

License:Apache License

@Test
public void test1() {
    DoubleWritable value = new DoubleWritable(5.9999);
    DirectWritableSerializer<DoubleWritable> serializer = new DirectWritableSerializer<>();
    Kryo kryo = new Kryo();
    DoubleWritable copy = serializer.copy(kryo, value);
    Assert.assertEquals(value.get(), copy.get(), 0);
}

From source file:org.apache.giraph.writable.kryo.DirectWritableSerializerCopyTest.java

License:Apache License

@Test
public void test2() {
    WDoubleArrayList list = new WDoubleArrayList();
    list.addW(new DoubleWritable(0.11111111));
    list.addW(new DoubleWritable(1000.9));
    list.addW(new DoubleWritable(99999999.99999999));
    DirectWritableSerializer<WDoubleArrayList> serializer = new DirectWritableSerializer<>();
    Kryo kryo = new Kryo();
    WDoubleArrayList copy = serializer.copy(kryo, list);
    DoubleWritable reusable = new DoubleWritable();
    copy.getIntoW(0, reusable);//from  w  w w. ja  v  a2  s .c o  m
    Assert.assertEquals(0.11111111, reusable.get(), 0);
    copy.getIntoW(1, reusable);
    Assert.assertEquals(1000.9, reusable.get(), 0);
    copy.getIntoW(2, reusable);
    Assert.assertEquals(99999999.99999999, reusable.get(), 0);
}

From source file:org.apache.giraph.writable.tuple.DoubleDoubleWritable.java

License:Apache License

/**
 * Constructor/*from w ww .ja  va2  s  .c  om*/
 *
 * @param left  the left value
 * @param right  the right value
 */
public DoubleDoubleWritable(double left, double right) {
    super(new DoubleWritable(left), new DoubleWritable(right));
}

From source file:org.apache.giraph.writable.tuple.IntDoubleWritable.java

License:Apache License

/**
 * Constructor/*from   w w  w . j  a v  a  2  s .com*/
 *
 * @param left  the left value
 * @param right  the right value
 */
public IntDoubleWritable(int left, double right) {
    super(new IntWritable(left), new DoubleWritable(right));
}

From source file:org.apache.giraph.writable.tuple.LongDoubleWritable.java

License:Apache License

/**
 * Constructor//from   ww  w.  j  a  v a  2 s  .  c  o  m
 *
 * @param left  the left value
 * @param right  the right value
 */
public LongDoubleWritable(long left, double right) {
    super(new LongWritable(left), new DoubleWritable(right));
}

From source file:org.apache.hama.graph.AbsDiffAggregator.java

License:Apache License

@Override
public DoubleWritable getValue() {
    return new DoubleWritable(absoluteDifference);
}

From source file:org.apache.hama.graph.AverageAggregator.java

License:Apache License

@Override
public DoubleWritable finalizeAggregation() {
    return new DoubleWritable(getValue().get() / getTimesAggregated().get());
}

From source file:org.apache.hama.graph.SumAggregator.java

License:Apache License

@Override
public DoubleWritable getValue() {
    return new DoubleWritable(sum);
}