How to use

buildRecommenderGraph

method

in

org.lenskit.LenskitRecommenderEngineBuilder

@Override
protected DAGNode<Component, Dependency> buildRecommenderGraph(DataAccessObject dao) {
  DAGNode<Component, Dependency> graph = super.buildRecommenderGraph(dao);
  if (mergePool != null) {
    logger.debug("deduplicating configuration graph");
    synchronized (mergePool) {
      graph = mergePool.merge(graph);
    }
  }
  return graph;
}

/**
 * Build the recommender directly, skipping an engine.  This does not separate the recommender from
 * the DAO, it just directly builds it.
 *
 * @param dao The data access object to use.  Can be `null` to build without a DAO, but this is only useful in
 *            special cases.
 * @return The built recommender engine, with {@linkplain ModelDisposition#EXCLUDED excluded}
 *         components removed.
 * @throws RecommenderBuildException if there is an error building the engine.
 */
public LenskitRecommender buildRecommender(DataAccessObject dao) throws RecommenderBuildException {
  DAGNode<Component, Dependency> graph = buildRecommenderGraph(dao);
  graph = instantiateGraph(graph);
  return new LenskitRecommender(graph);
}

/**
 * Build the recommender engine.
 *
 * @param dao The data access object to use.  Can be `null` to build without a DAO, but this is only useful in
 *            special cases.
 * @return The built recommender engine, with {@linkplain ModelDisposition#EXCLUDED excluded}
 *         components removed.
 * @throws RecommenderBuildException if there is an error building the engine.
 */
public LenskitRecommenderEngine build(DataAccessObject dao) throws RecommenderBuildException {
  DAGNode<Component, Dependency> graph = buildRecommenderGraph(dao);
  graph = instantiateGraph(graph);
  graph = rewriteExcludedComponents(graph, dao);
  boolean instantiable = GraphtUtils.getPlaceholderNodes(graph).isEmpty();
  return new LenskitRecommenderEngine(graph, instantiable);
}

/**
 * Build the recommender directly, skipping an engine.  This does not separate the recommender from
 * the DAO, it just directly builds it.
 *
 * @param dao The data access object to use.  Can be `null` to build without a DAO, but this is only useful in
 *            special cases.
 * @return The built recommender engine, with {@linkplain ModelDisposition#EXCLUDED excluded}
 *         components removed.
 * @throws RecommenderBuildException if there is an error building the engine.
 */
public LenskitRecommender buildRecommender(DataAccessObject dao) throws RecommenderBuildException {
  DAGNode<Component, Dependency> graph = buildRecommenderGraph(dao);
  graph = instantiateGraph(graph);
  return new LenskitRecommender(graph);
}

/**
 * Build the recommender engine.
 *
 * @param dao The data access object to use.  Can be `null` to build without a DAO, but this is only useful in
 *            special cases.
 * @return The built recommender engine, with {@linkplain ModelDisposition#EXCLUDED excluded}
 *         components removed.
 * @throws RecommenderBuildException if there is an error building the engine.
 */
public LenskitRecommenderEngine build(DataAccessObject dao) throws RecommenderBuildException {
  DAGNode<Component, Dependency> graph = buildRecommenderGraph(dao);
  graph = instantiateGraph(graph);
  graph = rewriteExcludedComponents(graph, dao);
  boolean instantiable = GraphtUtils.getPlaceholderNodes(graph).isEmpty();
  return new LenskitRecommenderEngine(graph, instantiable);
}