Package org.apache.mahout.math

Examples of org.apache.mahout.math.DenseVector.nonZeroes()

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    for (IntWritable row : recordWriter.getKeys()) {
      List<VectorWritable> list = recordWriter.getValue(row);
      Vector v = list.get(0).get();
      assertEquals(8, v.size());
      for (Vector.Element element : v.nonZeroes()) {
        assertEquals(element.index(), v.get(element.index()), 0.001);
      }
    }
  }
 
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  public void testAddToVector() {
    FeatureVectorEncoder enc = new StaticWordValueEncoder("word");
    Vector v = new DenseVector(200);
    enc.addToVector("word1", v);
    enc.addToVector("word2", v);
    Iterator<Vector.Element> i = v.nonZeroes().iterator();
    Iterator<Integer> j = ImmutableList.of(7, 118, 119, 199).iterator();
    while (i.hasNext()) {
      Vector.Element element = i.next();
      assertEquals(j.next().intValue(), element.index());
      assertEquals(1, element.get(), 0);
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    enc.setDictionary(ImmutableMap.<String, Double>of("word1", 3.0, "word2", 1.5));
    Vector v = new DenseVector(200);
    enc.addToVector("word1", v);
    enc.addToVector("word2", v);
    enc.addToVector("word3", v);
    Iterator<Vector.Element> i = v.nonZeroes().iterator();
    Iterator<Integer> j = ImmutableList.of(7, 101, 118, 119, 152, 199).iterator();
    Iterator<Double> k = ImmutableList.of(3.0, 0.75, 1.5, 1.5, 0.75, 3.0).iterator();
    while (i.hasNext()) {
      Vector.Element element = i.next();
      assertEquals(j.next().intValue(), element.index());
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    Iterator<Double> k = ImmutableList.of(3.0, 0.75, 1.5, 1.5, 0.75, 3.0).iterator();
    while (i.hasNext()) {
      Vector.Element element = i.next();
      assertEquals(j.next().intValue(), element.index());
    }
    i = v.nonZeroes().iterator();
    while (i.hasNext()) {
      Vector.Element element = i.next();
      assertEquals(String.format("checking v[%d]", element.index()), k.next(), element.get(), 0);
    }
    assertFalse(j.hasNext());
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    Vector v = new DenseVector(200);
    enc.addToVector("word1", v);  // weight is log(2/1.5)
    enc.addToVector("word2", v);  // weight is log(3.5 / 1.5)
    enc.addToVector("word1", v);  // weight is log(4.5 / 2.5) (but overlays on first value)
    enc.addToVector("word3", v);  // weight is log(6 / 1.5)
    Iterator<Vector.Element> i = v.nonZeroes().iterator();
    Iterator<Integer> j = ImmutableList.of(7, 101, 118, 119, 152, 199).iterator();
    Iterator<Double> k = ImmutableList.of(Math.log(2 / 1.5) + Math.log(4.5 / 2.5),
                                          Math.log(6 / 1.5), Math.log(3.5 / 1.5),
                                          Math.log(3.5 / 1.5), Math.log(6 / 1.5),
                                          Math.log(2 / 1.5) + Math.log(4.5 / 2.5)).iterator();
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    for (IntWritable row : recordWriter.getKeys()) {
      List<VectorWritable> list = recordWriter.getValue(row);
      Vector v = list.get(0).get();
      assertEquals(8, v.size());
      for (Vector.Element element : v.nonZeroes()) {
        assertEquals(element.index(), v.get(element.index()), 0.001);
      }
    }
  }
 
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