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RankSys PreferenceData as DataModel for issue #83
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137
rival-core/src/main/java/net/recommenders/rival/core/ext/RankSysDataModel.java
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|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| /* | ||
| * Copyright 2016 recommenders.net. | ||
| * | ||
| * Licensed 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 net.recommenders.rival.core.ext; | ||
|
|
||
| import es.uam.eps.ir.ranksys.fast.index.FastItemIndex; | ||
| import es.uam.eps.ir.ranksys.fast.index.FastUserIndex; | ||
| import es.uam.eps.ir.ranksys.fast.index.SimpleFastItemIndex; | ||
| import es.uam.eps.ir.ranksys.fast.index.SimpleFastUserIndex; | ||
| import es.uam.eps.ir.ranksys.fast.preference.SimpleFastPreferenceData; | ||
| import java.util.ArrayList; | ||
| import java.util.HashSet; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
| import java.util.stream.Stream; | ||
| import net.recommenders.rival.core.DataModelIF; | ||
| import org.jooq.lambda.tuple.Tuple; | ||
| import org.jooq.lambda.tuple.Tuple3; | ||
|
|
||
| /** | ||
| * | ||
| * @author <a href="http://github.com/abellogin">Alejandro</a> | ||
| */ | ||
| public class RankSysDataModel<U, I> implements DataModelIF<U, I> { | ||
|
|
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| private SimpleFastPreferenceData<U, I> model; | ||
| private List<Tuple3<U, I, Double>> tuples; | ||
| private Set<U> users; | ||
| private Set<I> items; | ||
|
|
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| public RankSysDataModel() { | ||
| clear(); | ||
| } | ||
|
|
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| private void generateDatamodel() { | ||
| FastUserIndex<U> uIndex = SimpleFastUserIndex.load(users.stream()); | ||
| FastItemIndex<I> iIndex = SimpleFastItemIndex.load(items.stream()); | ||
| model = SimpleFastPreferenceData.load(tuples.stream(), uIndex, iIndex); | ||
| } | ||
|
|
||
| @Override | ||
| public void addPreference(U u, I i, Double d) { | ||
| if (model != null) { | ||
| throw new IllegalArgumentException("DataModel already generated. It is not possible to add more information."); | ||
| } | ||
| users.add(u); | ||
| items.add(i); | ||
| tuples.add(Tuple.tuple(u, i, d)); | ||
| } | ||
|
|
||
| @Override | ||
| public Double getUserItemPreference(U u, I i) { | ||
| if (model == null) { | ||
| generateDatamodel(); | ||
| } | ||
| return model.getPreference(u, i).get().v2; | ||
| } | ||
|
|
||
| @Override | ||
| public Iterable<I> getUserItems(U u) { | ||
| if (model == null) { | ||
| generateDatamodel(); | ||
| } | ||
| Stream<I> s = model.getUserPreferences(u).map(p -> p.v1()); | ||
| return new Iterable<I>() { | ||
| @Override | ||
| public Iterator<I> iterator() { | ||
| return s.iterator(); | ||
| } | ||
| }; | ||
| } | ||
|
|
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| @Override | ||
| public Iterable<I> getItems() { | ||
| if (model == null) { | ||
| generateDatamodel(); | ||
| } | ||
| Stream<I> s = model.getItemsWithPreferences(); | ||
| return new Iterable<I>() { | ||
| @Override | ||
| public Iterator<I> iterator() { | ||
| return s.iterator(); | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| @Override | ||
| public Iterable<U> getUsers() { | ||
| if (model == null) { | ||
| generateDatamodel(); | ||
| } | ||
| Stream<U> s = model.getUsersWithPreferences(); | ||
| return new Iterable<U>() { | ||
| @Override | ||
| public Iterator<U> iterator() { | ||
| return s.iterator(); | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| @Override | ||
| public int getNumItems() { | ||
| if (model == null) { | ||
| generateDatamodel(); | ||
| } | ||
| return model.numItems(); | ||
| } | ||
|
|
||
| @Override | ||
| public int getNumUsers() { | ||
| if (model == null) { | ||
| generateDatamodel(); | ||
| } | ||
| return model.numUsers(); | ||
| } | ||
|
|
||
| @Override | ||
| public void clear() { | ||
| model = null; | ||
| tuples = new ArrayList<>(); | ||
| users = new HashSet<>(); | ||
| items = new HashSet<>(); | ||
| } | ||
| } |