猫头鹰隐士调试可满足性检查

Question

我正在使用owlapi v3.5.6使用隐士v1.3.8.4，并遇到了reasoner.isSatisfiable(clazz)永远运行的问题。

有没有办法检查隐士在做什么，即一种获取调试信息的方法？

我当前的设置看起来大致喜欢

OWLReasonerFactory reasonerFactory = new Reasoner.ReasonerFactory();
OWLReasonerConfiguration config;
if (this.verbose_output) {
    ConsoleProgressMonitor progressMonitor = new ConsoleProgressMonitor();
    config = new SimpleConfiguration(
        progressMonitor
    );
} else {
    config = new SimpleConfiguration();
}
OWLReasoner reasoner = reasonerFactory.createReasoner(this.ontology, config);
...
for (OWLClass c: this.ontology.getClassesInSignature(this.include_import_closure)) {
    if (!reasoner.isSatisfiable(c)) {  // This step takes forever
        continue;
    }
    ...
}

Answer 1

不确定这是否有帮助，但是有些类与调试有关，尽管我从未使用过这些类。您可以尝试使用以下配置选项

Configuration config=new Configuration();
// Lets make HermiT open a debugger window from which we can control the 
// further actions that HermiT performs. 
// DEBUGGER_HISTORY_ON will cause HermiT to save the deriviation tree for 
// each derived conclusion. 
// DEBUGGER_NO_HISTORY will not save the derivation tree, so no causes for a 
// clash can be given, but the memory requirement is smaller. 
config.tableauMonitorType=TableauMonitorType.DEBUGGER_HISTORY_ON;
// Now we can start and create the reasoner with the above created configuration.
Reasoner hermit = new Reasoner(config,ontology);
// This will open the debugger window at runtime and it should say:
// Good morning Dr. Chandra. This is HAL. I'm ready for my first lesson.
// Derivation history is on.
// Reasoning task started: ABox satisfiability
// > 
// you can press 'c' to make HermiT continue with checking whether the ontology 
// is consistent
hermit.isSatisfiable(c); // for a class 'c'
// HermiT should now have said 'Reasoning task finished: true' in the debugger window. 
// Now, you can type 'showModel' to see all the assertions in the ABox that HermiT generated. 

否则，也许日志级别可能会有所帮助。

Answer 2

获取反馈的另一种方法是使用剖面。JVISUALVM包含在所有最近的Oracle JRES中，采样器模式将为您提供有关隐士在做什么的好线索。这不是进度监视器，而是有助于了解降低事物的速度是否是本体论的大小或特定构造的大小。