Package org.apache.mahout.math

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

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        for (int i = 0; i < vecSize; i++) {
          extendAColIfNeeded(i, aRowCount + 1);
          aCols[i].setQuick(aRowCount, vec.getQuick(i));
        }
      } else {
        for (Vector.Element vecEl : vec.nonZeroes()) {
          int i = vecEl.index();
          extendAColIfNeeded(i, aRowCount + 1);
          aCols[i].setQuick(aRowCount, vecEl.get());
        }
      }
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          Vector aCol;
          if (btIndex > aCols.length || (aCol = aCols[btIndex]) == null) {
            continue;
          }
          int j = -1;
          for (Vector.Element aEl : aCol.nonZeroes()) {
            j = aEl.index();

            // outKey.setTaskItemOrdinal(j);
            // outValue.set(btVec.times(aEl.get())); // assign might work better
            // // with memory after all.
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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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        if (v.isDense()) {
          for (int i = 0; i < v.size(); i++) {
            dd[i] = v.getQuick(i);
          }
        } else {
          for (Vector.Element el : v.nonZeroes()) {
            dd[el.index()] = el.get();
          }
        }
        denseData.add(dd);
      }
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    // check if sizeOFNonZeroElementsInVector = maxEntries
    assertEquals(6, VectorHelper.topEntries(v, 6).size());
    // check if sizeOfNonZeroElementsInVector < maxEntries
    assertTrue(VectorHelper.topEntries(v, 9).size() < 9);
    // check if sizeOfNonZeroElementsInVector > maxEntries
    assertTrue(VectorHelper.topEntries(v, 5).size() < Iterables.size(v.nonZeroes()));
  }

  @Test
  public void testTopEntriesWhenAllZeros() throws Exception {
    Vector v = new SequentialAccessSparseVector(10);
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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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