斯坦福nlp：解析树

Posted 2021-04-18

我有这句话：My dog also likes eating sausage.

我得到以下解析树：

(ROOT
 (S
   (NP (PRP$ My) (NN dog))
   (ADVP (RB also))
   (VP (VBZ likes)
     (S
       (VP (VBG eating)
        (NP (NN sausage)))))
(. .)))

我如何只获得语法类别，即：NP，ADVP，VP等？

我试过这段代码：

  Tree t=sentence.get(TreeAnnotation.class);
  t.labels();

答案

从句子注释中，您可以获得各种类型的依赖词集合。这可能是您正在寻找的“下一级”。

Tree tree = sentenceAnnotation.get(TreeAnnotation.class);                             
// print the tree if needed                                                           
SemanticGraph basic = sentenceAnnotation.get(BasicDependenciesAnnotation.class);      
Collection<TypedDependency> deps = basic.typedDependencies();                         
for (TypedDependency typedDep : deps) {                                               
    GrammaticalRelation reln = typedDep.reln();                                       
    String type = reln.toString();                                                    
}                                                                                     

SemanticGraph colapsed = sentenceAnnotation                                           
        .get(CollapsedDependenciesAnnotation.class);                          
Collection<TypedDependency> deps = colapsed.typedDependencies();                      
for (TypedDependency typedDep : deps) {                                               
    GrammaticalRelation reln = typedDep.reln();                                       
    String type = reln.toString();                                                    
}                                                                                     

SemanticGraph ccProcessed = sentenceAnnotation                                        
        .get(CollapsedCCProcessedDependenciesAnnotation.class);               
Collection<TypedDependency> deps = ccProcessed.typedDependencies();                   
for (TypedDependency typedDep : deps) {                                               
    GrammaticalRelation reln = typedDep.reln();                                       
    String type = reln.toString();                                                    
}