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;
}
}
public static void configureArguments(ArgumentParser parser) {
InputData.configureArguments(parser);
ScriptEnvironment.configureArguments(parser);
parser
.addArgument("-c", "--config-file")
.type(File.class)
.action(Arguments.append())
.metavar("FILE")
.help("use configuration from FILE");
parser
.addArgument("-m", "--model-file")
.type(File.class)
.metavar("FILE")
.help("load model from FILE");
parser.addArgument("--print-channel").metavar("CHAN").help("also print value from CHAN");
parser.addArgument("user").type(Long.class).metavar("USER").help("predict for USER");
parser
.addArgument("items")
.type(Long.class)
.metavar("ITEM")
.nargs("+")
.help("predict for ITEMs");
}