List of usage examples for org.apache.mahout.cf.taste.model PreferenceArray length
int length();
From source file:GavaFactorizer.java
License:Apache License
private int countPreferences() throws TasteException { int numPreferences = 0; LongPrimitiveIterator userIDs = dataModel.getUserIDs(); while (userIDs.hasNext()) { PreferenceArray preferencesFromUser = dataModel.getPreferencesFromUser(userIDs.nextLong()); numPreferences += preferencesFromUser.length(); }// ww w .ja v a 2 s . c o m return numPreferences; }
From source file:CandidateItemsStrategyCustom.java
@Override public FastIDSet getCandidateItems(long l, PreferenceArray preferencesFromUser, DataModel dm, boolean bln) throws TasteException { List<Long> specificlItemIDs = new ArrayList<>(); FastIDSet candidateItemIDs = new FastIDSet(); for (long itemID : specificlItemIDs) { candidateItemIDs.add(itemID);//from w w w . j ava2 s .co m } for (int j = 0; j < preferencesFromUser.length(); j++) { candidateItemIDs.remove(preferencesFromUser.getItemID(j)); } return candidateItemIDs; }
From source file:alto.plugin.webradio.recommender.MongoDBDataModel.java
License:Apache License
private DataModel removeUserItem(long userID, Iterable<List<String>> items) { FastByIDMap<PreferenceArray> rawData = ((GenericDataModel) delegate).getRawUserData(); for (List<String> item : items) { PreferenceArray prefs = rawData.get(userID); long itemID = Long.parseLong(item.get(0)); if (prefs != null) { boolean exists = false; int length = prefs.length(); for (int i = 0; i < length; i++) { if (prefs.getItemID(i) == itemID) { exists = true;/* w w w .ja va2s . c o m*/ break; } } if (exists) { rawData.remove(userID); if (length > 1) { PreferenceArray newPrefs = new GenericUserPreferenceArray(length - 1); for (int i = 0, j = 0; i < length; i++, j++) { if (prefs.getItemID(i) == itemID) { j--; } else { newPrefs.set(j, prefs.get(i)); } } rawData.put(userID, newPrefs); } log.info("Removing userID: {} itemID: {}", userID, itemID); if (mongoManage) { removeMongoUserItem(Long.toString(userID), Long.toString(itemID)); } } } } return new GenericDataModel(rawData); }
From source file:alto.plugin.webradio.recommender.MongoDBDataModel.java
License:Apache License
private DataModel addUserItem(long userID, Iterable<List<String>> items) { FastByIDMap<PreferenceArray> rawData = ((GenericDataModel) delegate).getRawUserData(); PreferenceArray prefs = rawData.get(userID); for (List<String> item : items) { long itemID = Long.parseLong(item.get(0)); float preferenceValue = Float.parseFloat(item.get(1)); boolean exists = false; if (prefs != null) { for (int i = 0; i < prefs.length(); i++) { if (prefs.getItemID(i) == itemID) { exists = true;/*from w w w.ja va2 s . com*/ prefs.setValue(i, preferenceValue); break; } } } if (!exists) { if (prefs == null) { prefs = new GenericUserPreferenceArray(1); } else { PreferenceArray newPrefs = new GenericUserPreferenceArray(prefs.length() + 1); for (int i = 0, j = 1; i < prefs.length(); i++, j++) { newPrefs.set(j, prefs.get(i)); } prefs = newPrefs; } prefs.setUserID(0, userID); prefs.setItemID(0, itemID); prefs.setValue(0, preferenceValue); log.info("Adding userID: {} itemID: {} preferenceValue: {}", userID, itemID, preferenceValue); rawData.put(userID, prefs); if (mongoManage) { addMongoUserItem(Long.toString(userID), Long.toString(itemID), Float.toString(preferenceValue)); } } } return new GenericDataModel(rawData); }
From source file:com.aguin.stock.recommender.WriteUserInfo.java
License:Apache License
public void readFromDB() { MongoDBDataModel md = MongoDBUserModel.instance(); if (!MongoDBUserModel.registered(user)) { System.out.format("User %s not registered. Please use -ip or -f options to add preferences first", user);/*from ww w . j a va2 s . c o m*/ return; } PreferenceArray pa = null; try { pa = md.getPreferencesFromUser(Long.parseLong(md.fromIdToLong(user, true))); } catch (TasteException e) { e.printStackTrace(); } catch (NumberFormatException e) { e.printStackTrace(); } if (pa.length() == 0) { System.out.format("Preferences for user %s\n", user); System.out.println("None"); } else { System.out.format("Preferences for user %s\n", user); System.out.println(pa.toString()); } }
From source file:com.anjuke.romar.mahout.persistence.FilePreferenceSource.java
License:Apache License
@Override public void compact() { // ????/*from ww w. jav a 2 s. c om*/ final long version = getCurrentVersion() - 1; if (version < 0) { return; } File latestSnapshotFile = getLatestSnapshotFile(); if (latestSnapshotFile != null && getSnapshotFileVersion(latestSnapshotFile) == version) { return; } synchronized (_snapshotWriterLock) { PrintWriter snapshotWriter = createWriter(getSnapshotFile(version)); try { final List<File> logFileList = getLogFileListUntilVersion(version); List<File> fileToIt = new ArrayList<File>(logFileList); if (latestSnapshotFile != null) { fileToIt.add(0, latestSnapshotFile); } PreferenceIterator it = new LogFileIterator(fileToIt); FastByIDMap<PreferenceArray> data = new FastByIDMap<PreferenceArray>(); while (it.hasNext()) { Preference pref = it.next(); if (it.getType() == PreferenceType.ADD) { Util.applyAdd(data, pref); } else if (it.getType() == PreferenceType.DELETE) { Util.applyRemove(data, pref); } } for (Entry<Long, PreferenceArray> entry : data.entrySet()) { PreferenceArray array = entry.getValue(); for (int i = 0, length = array.length(); i < length; i++) { long userID = array.getUserID(i); long itemID = array.getItemID(i); float value = array.getValue(i); snapshotWriter.print(userID); snapshotWriter.print(','); snapshotWriter.print(itemID); snapshotWriter.print(','); snapshotWriter.println(value); } } snapshotWriter.flush(); snapshotWriter.close(); removeFile(); } finally { snapshotWriter.close(); } } }
From source file:com.anjuke.romar.mahout.util.Util.java
License:Apache License
public static void applyAdd(FastByIDMap<PreferenceArray> data, Preference addPreference) { long userID = addPreference.getUserID(); long itemID = addPreference.getItemID(); float preferenceValue = addPreference.getValue(); PreferenceArray prefs = data.get(userID); boolean exists = false; if (prefs != null) { for (int i = 0; i < prefs.length(); i++) { if (prefs.getItemID(i) == itemID) { exists = true;//from w w w.j a v a 2s . c om prefs.setValue(i, preferenceValue); break; } } } if (!exists) { if (prefs == null) { prefs = new GenericUserPreferenceArray(1); } else { PreferenceArray newPrefs = new GenericUserPreferenceArray(prefs.length() + 1); for (int i = 0, j = 1; i < prefs.length(); i++, j++) { newPrefs.set(j, prefs.get(i)); } prefs = newPrefs; } prefs.setUserID(0, userID); prefs.setItemID(0, itemID); prefs.setValue(0, preferenceValue); data.put(userID, prefs); } }
From source file:com.anjuke.romar.mahout.util.Util.java
License:Apache License
public static void applyRemove(FastByIDMap<PreferenceArray> data, Preference removePreference) { long userID = removePreference.getUserID(); long itemID = removePreference.getItemID(); PreferenceArray prefs = data.get(userID); if (prefs != null) { boolean exists = false; int length = prefs.length(); for (int i = 0; i < length; i++) { if (prefs.getItemID(i) == itemID) { exists = true;// w ww . jav a2 s.c o m break; } } if (exists) { if (length == 1) { data.remove(userID); } else { PreferenceArray newPrefs = new GenericUserPreferenceArray(length - 1); for (int i = 0, j = 0; i < length; i++, j++) { if (prefs.getItemID(i) == itemID) { j--; } else { newPrefs.set(j, prefs.get(i)); } } data.put(userID, newPrefs); } } } }
From source file:com.innometrics.integration.app.recommender.ml.als.ALSWRFactorizer.java
License:Apache License
protected static Vector ratingVector(PreferenceArray prefs) { double[] ratings = new double[prefs.length()]; for (int n = 0; n < prefs.length(); n++) { ratings[n] = prefs.get(n).getValue(); }// w w w.j ava 2 s. c o m return new DenseVector(ratings, true); }
From source file:com.innometrics.integration.app.recommender.ml.als.ALSWRFactorizer.java
License:Apache License
protected Vector sparseItemRatingVector(PreferenceArray prefs) { SequentialAccessSparseVector ratings = new SequentialAccessSparseVector(Integer.MAX_VALUE, prefs.length()); for (Preference preference : prefs) { ratings.set(userIndex(preference.getUserID()), preference.getValue()); }//w w w.j av a 2 s. c o m return ratings; }