@Override
public void execute() throws IOException, RecommenderBuildException {
LenskitConfiguration dataConfig = input.getConfiguration();
LenskitRecommenderEngineBuilder builder = LenskitRecommenderEngine.newBuilder();
for (LenskitConfiguration config : environment.loadConfigurations(getConfigFiles())) {
builder.addConfiguration(config);
}
builder.addConfiguration(dataConfig, ModelDisposition.EXCLUDED);
Stopwatch timer = Stopwatch.createStarted();
LenskitRecommenderEngine engine = builder.build();
timer.stop();
logger.info("built model in {}", timer);
File output = getOutputFile();
CompressionMode comp = CompressionMode.autodetect(output);
logger.info("writing model to {}", output);
Closer closer = Closer.create();
try {
OutputStream stream = closer.register(new FileOutputStream(output));
stream = closer.register(comp.wrapOutput(stream));
engine.write(stream);
} catch (Throwable th) { // NOSONAR using a closer
throw closer.rethrow(th);
} finally {
closer.close();
}
}
@SuppressWarnings("deprecation")
@Before
public void setup() throws RecommenderBuildException {
List<Rating> rs = new ArrayList<Rating>();
rs.add(Rating.create(1, 6, 4));
rs.add(Rating.create(2, 6, 2));
rs.add(Rating.create(1, 7, 3));
rs.add(Rating.create(2, 7, 2));
rs.add(Rating.create(3, 7, 5));
rs.add(Rating.create(4, 7, 2));
rs.add(Rating.create(1, 8, 3));
rs.add(Rating.create(2, 8, 4));
rs.add(Rating.create(3, 8, 3));
rs.add(Rating.create(4, 8, 2));
rs.add(Rating.create(5, 8, 3));
rs.add(Rating.create(6, 8, 2));
rs.add(Rating.create(1, 9, 3));
rs.add(Rating.create(3, 9, 4));
EventCollectionDAO dao = new EventCollectionDAO(rs);
LenskitConfiguration config = new LenskitConfiguration();
config.bind(EventDAO.class).to(dao);
config.bind(ItemScorer.class).to(ItemItemScorer.class);
// this is the default
config.bind(UserVectorNormalizer.class).to(DefaultUserVectorNormalizer.class);
config.bind(VectorNormalizer.class).to(IdentityVectorNormalizer.class);
LenskitRecommenderEngine engine = LenskitRecommenderEngine.build(config);
session = engine.createRecommender();
recommender = session.getItemRecommender();
}
@Test
public void testSnapshot() throws RecommenderBuildException {
List<Rating> rs = new ArrayList<Rating>();
rs.add(Ratings.make(1, 5, 2));
rs.add(Ratings.make(1, 7, 4));
rs.add(Ratings.make(8, 4, 5));
rs.add(Ratings.make(8, 5, 4));
EventDAO dao = EventCollectionDAO.create(rs);
LenskitConfiguration config = new LenskitConfiguration();
config.bind(EventDAO.class).to(dao);
config.bind(ItemScorer.class).to(UserUserItemScorer.class);
config.bind(NeighborFinder.class).to(SnapshotNeighborFinder.class);
LenskitRecommenderEngine engine = LenskitRecommenderEngine.build(config);
Recommender rec = engine.createRecommender();
assertThat(rec.getItemScorer(), instanceOf(UserUserItemScorer.class));
assertThat(rec.getItemRecommender(), instanceOf(TopNItemRecommender.class));
RatingPredictor pred = rec.getRatingPredictor();
assertThat(pred, instanceOf(SimpleRatingPredictor.class));
Recommender rec2 = engine.createRecommender();
assertThat(rec2.getItemScorer(), not(sameInstance(rec.getItemScorer())));
}
@Override
@SuppressWarnings({"rawtypes", "unchecked"})
public void execute() throws IOException, RecommenderBuildException {
LenskitRecommenderEngine engine = loadEngine();
long user = options.getLong("user");
List<Long> items = options.get("items");
LenskitRecommender rec = engine.createRecommender();
RatingPredictor pred = rec.getRatingPredictor();
if (pred == null) {
logger.error("recommender has no rating predictor");
throw new UnsupportedOperationException("no rating predictor");
}
logger.info("predicting {} items", items.size());
Symbol pchan = getPrintChannel();
Stopwatch timer = Stopwatch.createStarted();
SparseVector preds = pred.predict(user, items);
Long2ObjectMap channel = null;
if (pchan != null) {
for (TypedSymbol sym : preds.getChannelSymbols()) {
if (sym.getRawSymbol().equals(pchan)) {
channel = preds.getChannel(sym);
}
}
}
for (VectorEntry e : preds) {
System.out.format(" %d: %.3f", e.getKey(), e.getValue());
if (channel != null) {
System.out.format(" (%s)", channel.get(e.getKey()));
}
System.out.println();
}
timer.stop();
logger.info("predicted for {} items in {}", items.size(), timer);
}
private LenskitRecommenderEngine loadEngine() throws RecommenderBuildException, IOException {
File modelFile = options.get("model_file");
if (modelFile == null) {
logger.info("creating fresh recommender");
LenskitRecommenderEngineBuilder builder = LenskitRecommenderEngine.newBuilder();
for (LenskitConfiguration config : environment.loadConfigurations(getConfigFiles())) {
builder.addConfiguration(config);
}
builder.addConfiguration(input.getConfiguration());
Stopwatch timer = Stopwatch.createStarted();
LenskitRecommenderEngine engine = builder.build();
timer.stop();
logger.info("built recommender in {}", timer);
return engine;
} else {
logger.info("loading recommender from {}", modelFile);
LenskitRecommenderEngineLoader loader = LenskitRecommenderEngine.newLoader();
for (LenskitConfiguration config : environment.loadConfigurations(getConfigFiles())) {
loader.addConfiguration(config);
}
loader.addConfiguration(input.getConfiguration());
Stopwatch timer = Stopwatch.createStarted();
LenskitRecommenderEngine engine;
CompressionMode comp = CompressionMode.autodetect(modelFile);
InputStream input = new FileInputStream(modelFile);
try {
input = comp.wrapInput(input);
engine = loader.load(input);
} finally {
input.close();
}
timer.stop();
logger.info("loaded recommender in {}", timer);
return engine;
}
}
@SuppressWarnings("deprecation")
@Before
public void setup() throws RecommenderBuildException {
List<Rating> rs = new ArrayList<Rating>();
rs.add(Ratings.make(1, 5, 2));
rs.add(Ratings.make(1, 7, 4));
rs.add(Ratings.make(8, 4, 5));
rs.add(Ratings.make(8, 5, 4));
EventDAO dao = new EventCollectionDAO(rs);
LenskitConfiguration config = new LenskitConfiguration();
config.bind(EventDAO.class).to(dao);
config.bind(ItemScorer.class).to(UserUserItemScorer.class);
config.bind(NeighborFinder.class).to(LiveNeighborFinder.class);
engine = LenskitRecommenderEngine.build(config);
}