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

Examples of org.apache.mahout.cf.taste.impl.model.GenericPreference

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  @Test
  public void testOnePref() throws Exception {
    DataModel dataModel = getDataModel(new long[] {1}, new Double[][] {{1.0}});
    PreferenceTransform zScore = new ZScore(dataModel);
    assertEquals(0.0, zScore.getTransformedValue(new GenericPreference(1, 0, 1.0f)), EPSILON);
  }
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  @Test
  public void testAllSame() throws Exception {
    DataModel dataModel = getDataModel(new long[] {1}, new Double[][] {{1.0,1.0,1.0}});
    PreferenceTransform zScore = new ZScore(dataModel);
    assertEquals(0.0, zScore.getTransformedValue(new GenericPreference(1, 0, 1.0f)), EPSILON);
    assertEquals(0.0, zScore.getTransformedValue(new GenericPreference(1, 1, 1.0f)), EPSILON);
    assertEquals(0.0, zScore.getTransformedValue(new GenericPreference(1, 2, 1.0f)), EPSILON);
  }
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    List<Preference> oneUserTrainingPrefs = null;
    List<Preference> oneUserTestPrefs = null;
    PreferenceArray prefs = dataModel.getPreferencesFromUser(userID);
    int size = prefs.length();
    for (int i = 0; i < size; i++) {
      Preference newPref = new GenericPreference(userID, prefs.getItemID(i), prefs.getValue(i));
      if (random.nextDouble() < trainingPercentage) {
        if (oneUserTrainingPrefs == null) {
          oneUserTrainingPrefs = Lists.newArrayListWithCapacity(3);
        }
        oneUserTrainingPrefs.add(newPref);
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    FastByIDMap<PreferenceArray> result = new FastByIDMap<PreferenceArray>();
    for (int i = 0; i < userIDs.length; i++) {
      List<Preference> prefsList = Lists.newArrayList();
      for (int j = 0; j < prefValues[i].length; j++) {
        if (prefValues[i][j] != null) {
          prefsList.add(new GenericPreference(userIDs[i], j, prefValues[i][j].floatValue()));
        }
      }
      if (!prefsList.isEmpty()) {
        result.put(userIDs[i], new GenericUserPreferenceArray(prefsList));
      }
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          Collection<Preference> userPrefs = userIDPrefMap.get(userID);
          if (userPrefs == null) {
            userPrefs = Lists.newArrayListWithCapacity(2);
            userIDPrefMap.put(userID, userPrefs);
          }
          userPrefs.add(new GenericPreference(userID, itemID, ratingValue));
          if (user.containsKey("created_at")
              && mongoTimestamp.compareTo(getDate(user.get("created_at"))) < 0) {
            mongoTimestamp = getDate(user.get("created_at"));
          }
        }
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public final class SamplingCandidateItemsStrategyTest extends TasteTestCase {

  @Test
  public void testStrategy() throws TasteException {
    List<Preference> prefsOfUser123 = Lists.newArrayList();
    prefsOfUser123.add(new GenericPreference(123L, 1L, 1.0f));

    List<Preference> prefsOfUser456 = Lists.newArrayList();
    prefsOfUser456.add(new GenericPreference(456L, 1L, 1.0f));
    prefsOfUser456.add(new GenericPreference(456L, 2L, 1.0f));

    List<Preference> prefsOfUser789 = Lists.newArrayList();
    prefsOfUser789.add(new GenericPreference(789L, 1L, 0.5f));
    prefsOfUser789.add(new GenericPreference(789L, 3L, 1.0f));

    PreferenceArray prefArrayOfUser123 = new GenericUserPreferenceArray(prefsOfUser123);

    FastByIDMap<PreferenceArray> userData = new FastByIDMap<PreferenceArray>();
    userData.put(123L, prefArrayOfUser123);
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    for (String line : new FileLineIterable(new File(qualifyingTxt))) {
      if (line.contains(MOVIE_DENOTER)) {
        currentMovieID = Long.parseLong(line.replaceAll(MOVIE_DENOTER, ""));
      } else {
        long userID = Long.parseLong(SEPARATOR.split(line)[0]);
        probes.add(new GenericPreference(userID, currentMovieID, 0));
      }
    }
    log.info("{} probes read...", probes.size());

    log.info("Reading ratings, creating probe set at {}/probeSet/ratings.tsv ...", outputPath);
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  }

  // Some overrideable methods to customize the class behavior:

  protected Preference buildPreference(ResultSet rs) throws SQLException {
    return new GenericPreference(getLongColumn(rs, 1), getLongColumn(rs, 2), rs.getFloat(3));
  }
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      for (String line : new FileLineIterable(movieFile, true)) {
        int firstComma = line.indexOf((int) ',');
        Integer userID = Integer.valueOf(line.substring(0, firstComma));
        int secondComma = line.indexOf((int) ',', firstComma + 1);
        float rating = Float.parseFloat(line.substring(firstComma + 1, secondComma));
        prefs.add(new GenericPreference(userID, itemID, rating));
      }
    } catch (IOException ioe) {
      throw new TasteException(ioe);
    }
    return new GenericItemPreferenceArray(prefs);
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        Collection<Preference> userPrefs = userIDPrefMap.get(userID);
        if (userPrefs == null) {
          userPrefs = new ArrayList<Preference>(2);
          userIDPrefMap.put(userID, userPrefs);
        }
        userPrefs.add(new GenericPreference(userID, movieID, rating));
      }
    }

    return GenericDataModel.toDataMap(userIDPrefMap, true);
  }
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