Package org.apache.mahout.math

Examples of org.apache.mahout.math.Vector.zSum()

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    v = lr.classify(new DenseVector(new double[]{1, 0}));
    assertEquals(Math.exp(-1) / (1 + Math.exp(-1) + Math.exp(-2)), v.get(0), 1.0e-8);
    assertEquals(Math.exp(-2) / (1 + Math.exp(-1) + Math.exp(-2)), v.get(1), 1.0e-8);

    v = lr.classifyFull(new DenseVector(new double[]{1, 0}));
    assertEquals(1.0, v.zSum(), 1.0e-8);
    assertEquals(1 / (1 + Math.exp(-1) + Math.exp(-2)), v.get(0), 1.0e-8);
    assertEquals(Math.exp(-1) / (1 + Math.exp(-1) + Math.exp(-2)), v.get(1), 1.0e-8);
    assertEquals(Math.exp(-2) / (1 + Math.exp(-1) + Math.exp(-2)), v.get(2), 1.0e-8);

    lr.setBeta(0, 1, 1);
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    assertEquals(Math.exp(-2) / (1 + Math.exp(-1) + Math.exp(-2)), v.get(2), 1.0e-8);

    lr.setBeta(0, 1, 1);

    v = lr.classifyFull(new DenseVector(new double[]{1, 1}));
    assertEquals(1.0, v.zSum(), 1.0e-8);
    assertEquals(Math.exp(0) / (1 + Math.exp(0) + Math.exp(-2)), v.get(1), 1.0e-3);
    assertEquals(Math.exp(-2) / (1 + Math.exp(0) + Math.exp(-2)), v.get(2), 1.0e-3);
    assertEquals(1 / (1 + Math.exp(0) + Math.exp(-2)), v.get(0), 1.0e-3);

    lr.setBeta(1, 1, 3);
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    assertEquals(1 / (1 + Math.exp(0) + Math.exp(-2)), v.get(0), 1.0e-3);

    lr.setBeta(1, 1, 3);

    v = lr.classifyFull(new DenseVector(new double[]{1, 1}));
    assertEquals(1.0, v.zSum(), 1.0e-8);
    assertEquals(Math.exp(0) / (1 + Math.exp(0) + Math.exp(1)), v.get(1), 1.0e-8);
    assertEquals(Math.exp(1) / (1 + Math.exp(0) + Math.exp(1)), v.get(2), 1.0e-8);
    assertEquals(1 / (1 + Math.exp(0) + Math.exp(1)), v.get(0), 1.0e-8);
  }
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  @Override
  protected void map(IntWritable key, VectorWritable value, Context context) throws IOException, InterruptedException {
    Vector vector = value.get();
    int label = key.get();
    double weight = Math.log((vector.zSum() + alphaI) / (labelSum.get(label) + vocabCount));
    perLabelThetaNormalizer.set(label, perLabelThetaNormalizer.get(label) + weight);
  }
 
  @Override
  protected void setup(Context context) throws IOException, InterruptedException {
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      labelSum = new RandomAccessSparseVector(labelMap.size()); 
    }
   
    int label = key.get();
    vector.addTo(featureSum);
    labelSum.set(label, labelSum.get(label) + vector.zSum());
  }
 
  @Override
  protected void setup(Context context) throws IOException, InterruptedException {
    super.setup(context);
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        t.set(2, "lots of text for testing");

        pv = PigVector.fromBytes(ev.exec(t));
        Vector v3 = pv.assign(v1, Functions.MINUS);
        assertEquals(10, v3.zSum(), 0);
        assertEquals(1, v3.maxValue(), 1);

        EncodeVector ev2 = new EncodeVector("100", "x+y", "x:numeric, not:text, y:text");
        t.set(2, "");
        pv = PigVector.fromBytes(ev2.exec(t));
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        EncodeVector ev2 = new EncodeVector("100", "x+y", "x:numeric, not:text, y:text");
        t.set(2, "");
        pv = PigVector.fromBytes(ev2.exec(t));
        Vector v4 = pv;
        assertEquals(3.1, v1.get(10), 0);
        assertEquals(3.1, v4.zSum(), 0);
        assertEquals(3.1, v4.maxValue(), 1);
    }

    @Test
    public void testBadIndex() throws IOException {
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      weightsPerFeature = new RandomAccessSparseVector(instance.size(), instance.getNumNondefaultElements());
    }

    int label = index.get();
    weightsPerFeature.assign(instance, Functions.PLUS);
    weightsPerLabel.set(label, weightsPerLabel.get(label) + instance.zSum());
  }

  @Override
  protected void cleanup(Context ctx) throws IOException, InterruptedException {
    if (weightsPerFeature != null) {
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    w.addToVector("and", v3);
    w.addToVector("more", v3);
    assertEquals(0, v3.minus(v2).norm(1), 0);

    // moreover, the locations set in the unweighted case should be the same as in the weighted case
    assertEquals(v3.zSum(), v3.dot(v1), 0);
  }

  @Test
  public void testAsString() {
    Locale.setDefault(Locale.ENGLISH);
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      weightsPerFeature = new RandomAccessSparseVector(instance.size(), instance.getNumNondefaultElements());
    }

    int label = index.get();
    weightsPerFeature.assign(instance, Functions.PLUS);
    weightsPerLabel.set(label, weightsPerLabel.get(label) + instance.zSum());
  }

  @Override
  protected void cleanup(Context ctx) throws IOException, InterruptedException {
    if (weightsPerFeature != null) {
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