Package org.apache.mahout.cf.taste.impl.common

Examples of org.apache.mahout.cf.taste.impl.common.LongPrimitiveIterator.nextLong()

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  @Test 
  public void testGetItems() throws Exception {
    LongPrimitiveIterator it = model.getItemIDs();
    assertNotNull(it);
    assertTrue(it.hasNext());
    assertEquals(123, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(234, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(456, it.nextLong());
    assertTrue(it.hasNext());
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    LongPrimitiveIterator it = model.getItemIDs();
    assertNotNull(it);
    assertTrue(it.hasNext());
    assertEquals(123, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(234, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(456, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(654, it.nextLong());
    assertTrue(it.hasNext());
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    assertTrue(it.hasNext());
    assertEquals(123, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(234, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(456, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(654, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(789, it.nextLong());
    assertTrue(it.hasNext());
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    assertTrue(it.hasNext());
    assertEquals(234, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(456, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(654, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(789, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(999, it.nextLong());
    assertFalse(it.hasNext());
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    assertTrue(it.hasNext());
    assertEquals(456, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(654, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(789, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(999, it.nextLong());
    assertFalse(it.hasNext());
    try {
      it.next();
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    assertTrue(it.hasNext());
    assertEquals(654, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(789, it.nextLong());
    assertTrue(it.hasNext());
    assertEquals(999, it.nextLong());
    assertFalse(it.hasNext());
    try {
      it.next();
      fail("Should throw NoSuchElementException");
    } catch (NoSuchElementException nsee) {
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      List<FastIDSet> clusters = new ArrayList<FastIDSet>();
      // Begin with a cluster for each user:
      LongPrimitiveIterator it = model.getUserIDs();
      while (it.hasNext()) {
        FastIDSet newCluster = new FastIDSet();
        newCluster.add(it.nextLong());
        clusters.add(newCluster);
      }

      boolean done = false;
      while (!done) {
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   */
  public static FastByIDMap<PreferenceArray> toDataMap(DataModel dataModel) throws TasteException {
    FastByIDMap<PreferenceArray> data = new FastByIDMap<PreferenceArray>(dataModel.getNumUsers());
    LongPrimitiveIterator it = dataModel.getUserIDs();
    while (it.hasNext()) {
      long userID = it.nextLong();
      data.put(userID, dataModel.getPreferencesFromUser(userID));
    }
    return data;
  }
 
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    userMap = new FastByIDMap<Integer>(numUsers);
   
    int idx = 0;
    LongPrimitiveIterator userIterator = dataModel.getUserIDs();
    while (userIterator.hasNext()) {
      userMap.put(userIterator.nextLong(), idx++);
    }
   
    int numItems = dataModel.getNumItems();
    itemMap = new FastByIDMap<Integer>(numItems);
   
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    itemMap = new FastByIDMap<Integer>(numItems);
   
    idx = 0;
    LongPrimitiveIterator itemIterator = dataModel.getItemIDs();
    while (itemIterator.hasNext()) {
      itemMap.put(itemIterator.nextLong(), idx++);
    }
   
    double average = getAveragePreference();
    double defaultValue = Math.sqrt((average - 1.0) / numFeatures);
   
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