Example usage for org.apache.mahout.cf.taste.impl.common FastIDSet isEmpty

Introduction

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

Prototype

public boolean isEmpty() 

Source Link

Usage

From source file:com.webir.popcornsaver.cluster.FarthestNeighborClusterSimilarity.java

License:Apache License

@Override
public double getSimilarity(FastIDSet cluster1, FastIDSet cluster2) throws TasteException {
    if (cluster1.isEmpty() || cluster2.isEmpty()) {
        return Double.NaN;
    }/* www . j a va2 s  . c  o  m*/
    double leastSimilarity = Double.POSITIVE_INFINITY;
    LongPrimitiveIterator someUsers = SamplingLongPrimitiveIterator.maybeWrapIterator(cluster1.iterator(),
            samplingRate);
    while (someUsers.hasNext()) {
        long userID1 = someUsers.next();
        LongPrimitiveIterator it2 = cluster2.iterator();
        while (it2.hasNext()) {
            double theSimilarity = similarity.userSimilarity(userID1, it2.next());
            if (theSimilarity < leastSimilarity) {
                leastSimilarity = theSimilarity;
            }
        }
    }
    // We skipped everything? well, at least try comparing the first Users to get some value
    if (leastSimilarity == Double.POSITIVE_INFINITY) {
        return similarity.userSimilarity(cluster1.iterator().next(), cluster2.iterator().next());
    }
    return leastSimilarity;
}

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From source file:net.myrrix.common.collection.FastIDSetTest.java

License:Apache License

@Test
public void testRemove() {
    FastIDSet set = new FastIDSet();
    set.add(1);/* w w  w  . ja  v  a  2  s . c  o m*/
    set.remove(1);
    assertEquals(0, set.size());
    assertTrue(set.isEmpty());
    assertFalse(set.contains(1));
}

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From source file:net.myrrix.common.collection.FastIDSetTest.java

License:Apache License

@Test
public void testClear() {
    FastIDSet set = new FastIDSet();
    set.add(1);/*from  w  w w .j  av a  2 s .  c om*/
    set.clear();
    assertEquals(0, set.size());
    assertTrue(set.isEmpty());
    assertFalse(set.contains(1));
}

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From source file:net.myrrix.common.collection.FastIDSetTest.java

License:Apache License

@Test
public void testSizeEmpty() {
    FastIDSet set = new FastIDSet();
    assertEquals(0, set.size());/*w  w  w . ja v a  2  s  . c om*/
    assertTrue(set.isEmpty());
    set.add(1);
    assertEquals(1, set.size());
    assertFalse(set.isEmpty());
    set.remove(1);
    assertEquals(0, set.size());
    assertTrue(set.isEmpty());
}

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From source file:net.myrrix.common.collection.FastIDSetTest.java

License:Apache License

@Test
public void testVersusHashSet() {
    FastIDSet actual = new FastIDSet(1);
    Collection<Integer> expected = new HashSet<Integer>(1000000);
    RandomGenerator r = RandomManager.getRandom();
    for (int i = 0; i < 1000000; i++) {
        double d = r.nextDouble();
        Integer key = r.nextInt(100);
        if (d < 0.4) {
            assertEquals(expected.contains(key), actual.contains(key));
        } else {// www . j a  va  2s  .  co  m
            if (d < 0.7) {
                assertEquals(expected.add(key), actual.add(key));
            } else {
                assertEquals(expected.remove(key), actual.remove(key));
            }
            assertEquals(expected.size(), actual.size());
            assertEquals(expected.isEmpty(), actual.isEmpty());
        }
    }
}

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