从语法结构投射到树 [英] Cast from GrammaticalStructure to Tree

问题描述

我正在试用斯坦福大学的新NN依赖解析器.根据他们提供的演示，解析是这样完成的:

I am trying out the new NN Dependency Parser from Stanford. According to the demo they have provided, this is how the parsing is done:

import edu.stanford.nlp.process.DocumentPreprocessor;
import edu.stanford.nlp.trees.GrammaticalStructure;
import edu.stanford.nlp.parser.nndep.DependencyParser;

...

GrammaticalStructure gs = null;

DocumentPreprocessor tokenizer = new DocumentPreprocessor(new StringReader(sentence));
for (List<HasWord> sent : tokenizer) {
    List<TaggedWord> tagged = tagger.tagSentence(sent);
    gs = parser.predict(tagged);

    // Print typed dependencies
    System.out.println(Grammatical structure: " + gs);
} 

现在，我想做的是对象gs，它是类GrammaticalStructure，要从edu.stanford.nlp.trees.Tree强制转换为Tree对象.

Now, what I want to do is this object gs, which is of class GrammaticalStructure, to be casted as a Tree object from edu.stanford.nlp.trees.Tree.

我天真地尝试了简单的转换:

I naively tried out with simple casting:

Tree t = (Tree) gs;

但是，这是不可能的(IDE给出错误:无法从GrammaticalStructure投射到Tree).

but, this is not possible (the IDE gives an error: Cannot cast from GrammaticalStructure to Tree).

我该怎么做?

推荐答案

您应该能够使用gs.root()获取树. 根据文档，该方法会返回表示语法结构的树(实际上是TreeGraphNode).

You should be able to get the Tree using gs.root(). According to the documentation, that method returns a Tree (actually, a TreeGraphNode) which represents the grammatical structure.

您可以使用gs.root().pennPrint()以人性化的方式打印该树.

You could print that tree in a human-friendly way with gs.root().pennPrint().

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