/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.mahout.cf.taste.impl;
import com.google.common.collect.Lists;
import org.apache.mahout.cf.taste.impl.common.FastByIDMap;
import org.apache.mahout.cf.taste.impl.common.FastIDSet;
import org.apache.mahout.cf.taste.impl.model.GenericBooleanPrefDataModel;
import org.apache.mahout.common.MahoutTestCase;
import org.apache.mahout.cf.taste.impl.model.GenericDataModel;
import org.apache.mahout.cf.taste.impl.model.GenericPreference;
import org.apache.mahout.cf.taste.impl.model.GenericUserPreferenceArray;
import org.apache.mahout.cf.taste.model.DataModel;
import org.apache.mahout.cf.taste.model.Preference;
import org.apache.mahout.cf.taste.model.PreferenceArray;
import java.util.List;
public abstract class TasteTestCase extends MahoutTestCase {
public static DataModel getDataModel(long[] userIDs, Double[][] prefValues) {
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));
}
}
return new GenericDataModel(result);
}
public static DataModel getBooleanDataModel(long[] userIDs, boolean[][] prefs) {
FastByIDMap<FastIDSet> result = new FastByIDMap<FastIDSet>();
for (int i = 0; i < userIDs.length; i++) {
FastIDSet prefsSet = new FastIDSet();
for (int j = 0; j < prefs[i].length; j++) {
if (prefs[i][j]) {
prefsSet.add(j);
}
}
if (!prefsSet.isEmpty()) {
result.put(userIDs[i], prefsSet);
}
}
return new GenericBooleanPrefDataModel(result);
}
protected static DataModel getDataModel() {
return getDataModel(
new long[] {1, 2, 3, 4},
new Double[][] {
{0.1, 0.3},
{0.2, 0.3, 0.3},
{0.4, 0.3, 0.5},
{0.7, 0.3, 0.8},
});
}
protected static DataModel getBooleanDataModel() {
return getBooleanDataModel(new long[] {1, 2, 3, 4},
new boolean[][] {
{false, true, false},
{false, true, true, false},
{true, false, false, true},
{true, false, true, true},
});
}
protected static boolean arrayContains(long[] array, long value) {
for (long l : array) {
if (l == value) {
return true;
}
}
return false;
}
}