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

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

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    FastByIDMap<PreferenceArray> testUserPrefs = new FastByIDMap<PreferenceArray>(
        1 + (int) (evaluationPercentage * numUsers));
   
    LongPrimitiveIterator it = dataModel.getUserIDs();
    while (it.hasNext()) {
      long userID = it.nextLong();
      if (random.nextDouble() < evaluationPercentage) {
        processOneUser(trainingPercentage, trainingUsers, testUserPrefs, userID, dataModel);
      }
    }
   
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  private static FastByIDMap<FastIDSet> toDataMap(DataModel dataModel) throws TasteException {
    FastByIDMap<FastIDSet> data = new FastByIDMap<FastIDSet>(dataModel.getNumUsers());
    LongPrimitiveIterator it = dataModel.getUserIDs();
    while (it.hasNext()) {
      long userID = it.nextLong();
      data.put(userID, dataModel.getItemIDsFromUser(userID));
    }
    return data;
  }
 
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  private synchronized void recompute() throws TasteException {
    Counters itemPreferenceCounts = new Counters();
    int numUsers = 0;
    LongPrimitiveIterator it = dataModel.getUserIDs();
    while (it.hasNext()) {
      PreferenceArray prefs = dataModel.getPreferencesFromUser(it.nextLong());
      int size = prefs.length();
      for (int i = 0; i < size; i++) {
        itemPreferenceCounts.increment(prefs.getItemID(i));
      }
      numUsers++;
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    RunningAverage precision = new FullRunningAverage();
    RunningAverage recall = new FullRunningAverage();
    RunningAverage fallOut = new FullRunningAverage();
    LongPrimitiveIterator it = dataModel.getUserIDs();
    while (it.hasNext()) {
      long userID = it.nextLong();
      if (random.nextDouble() < evaluationPercentage) {
        long start = System.currentTimeMillis();
        FastIDSet relevantItemIDs = new FastIDSet(at);
        PreferenceArray prefs = dataModel.getPreferencesFromUser(userID);
        int size = prefs.length();
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        if (numRelevantItems > 0) {
          FastByIDMap<PreferenceArray> trainingUsers = new FastByIDMap<PreferenceArray>(dataModel
              .getNumUsers());
          LongPrimitiveIterator it2 = dataModel.getUserIDs();
          while (it2.hasNext()) {
            processOtherUser(userID, relevantItemIDs, trainingUsers, it2
                .nextLong(), dataModel);
          }
         
          DataModel trainingModel = dataModelBuilder == null ? new GenericDataModel(trainingUsers)
              : dataModelBuilder.buildDataModel(trainingUsers);
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  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());
    assertFalse(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());
    assertFalse(it.hasNext());
    try {
      it.next();
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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());
    assertFalse(it.hasNext());
    try {
      it.next();
      fail("Should throw NoSuchElementException");
    } catch (NoSuchElementException nsee) {
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