使用OWL API进行本体推理

Question

我已经使用OWL API4.1.3加载了我的本体，它并不大。由于需要使用推断信息，我还使用Hermit1.3.8.413库进行了推理。下面的代码显示了我是如何完成的。

public class ReasonRDF {

public static void main(String[] args) throws OWLOntologyCreationException, OWLOntologyStorageException {

    readRDF("C:/Users/workspace/Ontology_matching/NVDB_Matching_v18_H_4_1_CONVERTYING/results/NewInstantiated/owl/OSM1.owl");

}
public static void readRDF(String address) throws OWLOntologyCreationException, OWLOntologyStorageException{
    OWLOntologyManager manager =OWLManager.createOWLOntologyManager();
    File file = new File (address);
    OWLOntology ont = manager.loadOntologyFromOntologyDocument(IRI.create(file));
    System.out.println("Ontology Loaded...");

    System.out.println("Logical IRI   : " + ont.getOntologyID());
    System.out.println("Format        : " + manager.getOntologyFormat(ont));
    System.out.println("Runtime memory: " + Runtime.getRuntime().totalMemory());      
      ReasonerFactory reasonerFactory = new ReasonerFactory();
      ConsoleProgressMonitor progressMonitor = new ConsoleProgressMonitor();
      Configuration config = new Configuration();
      config.ignoreUnsupportedDatatypes=true;
      config.reasonerProgressMonitor= progressMonitor;
      OWLReasoner reasoner = reasonerFactory.createReasoner(ont, config);


      long t0 = System.nanoTime();

      System.out.println("Starting to add axiom generators");
      OWLDataFactory datafactory = manager.getOWLDataFactory();
      List<InferredAxiomGenerator<? extends OWLAxiom>> inferredAxioms = new ArrayList<InferredAxiomGenerator<? extends OWLAxiom>>();
      //inferredAxioms.add(new InferredSubClassAxiomGenerator());
      inferredAxioms.add(new InferredClassAssertionAxiomGenerator());
      //inferredAxioms.add(new InferredDataPropertyCharacteristicAxiomGenerator());
      //inferredAxioms.add(new InferredObjectPropertyCharacteristicAxiomGenerator());
      //inferredAxioms.add(new InferredEquivalentClassAxiomGenerator());
      //inferredAxioms.add(new InferredPropertyAssertionGenerator());
      //inferredAxioms.add(new InferredInverseObjectPropertiesAxiomGenerator());         
      inferredAxioms.add(new InferredSubDataPropertyAxiomGenerator());
      inferredAxioms.add(new InferredSubObjectPropertyAxiomGenerator());
      System.out.println("finished adding axiom generators");

//        List<InferredIndividualAxiomGenerator<? extends OWLIndividualAxiom>> individualAxioms= new ArrayList<InferredIndividualAxiomGenerator<? extends OWLIndividualAxiom>>();
//        inferredAxioms.addAll(individualAxioms);

    // for writing inferred axioms to the new ontology
    OWLOntology infOnt = manager.createOntology(IRI.create(ont.getOntologyID().getOntologyIRI().get()+"_inferred"));

      // use generator and reasoner to infer some axioms
      System.out.println("Starting to infer");
      InferredOntologyGenerator iog = new InferredOntologyGenerator(reasoner, inferredAxioms);
      //InferredOntologyGenerator iog = new InferredOntologyGenerator(reasoner);

      System.out.println("Inferrence is over");

      System.out.println("Storing the results");
      iog.fillOntology(datafactory,infOnt);
      System.out.println("Results are stored");
      long elapsed_time = System.nanoTime()-t0;
      System.out.println(elapsed_time);

      // save the ontology
      manager.saveOntology(infOnt, IRI.create("file:///C:/Users/ontologies/NVDB4_test.rdf"));
    }
}

它不会抛出任何错误，但它需要将推断出的本体存储在一个新文件中。事实上，即使在2天后，它也没有完成工作。我的IDE是eclipse EE，我为运行这个应用程序提供了6到12 GB的内存。我找不到任何问题与我的代码或我的本体。

Answer 1

一个本体的大小只与在它上进行推理的复杂性有松散的关系--对于推理者来说，一些小的本体比其他非常大的本体要困难得多。（当然也有bug的可能性）。

您有可能共享本体内容吗？

编辑：尝试了本体，看起来大小并没有那么重要；事实证明，这个本体论很难推理。

我尝试禁用SWRL规则并跳过类断言生成，但仍然遇到了一个障碍。对象属性的数量和拓扑结构足以给HermiT造成很大的压力。

还要考虑一下通过分区ABox来分离个体是否有意义--如果有一些个体您确信不相关，那么在多个本体中分离断言可能会很好。大量不相关的个体可能会导致推理者尝试永远不会提供有用的推理的推理路径。