使用StanfordParser从解析的句子中获取类型化的依存关系

问题描述

使用NLTK的StanfordParser，我可以解析这样的句子:

Using NLTK's StanfordParser, I can parse a sentence like this:

os.environ['STANFORD_PARSER'] = 'C:\jars' 
os.environ['STANFORD_MODELS'] = 'C:\jars'  
os.environ['JAVAHOME'] ='C:\ProgramData\Oracle\Java\javapath' 
parser = stanford.StanfordParser(model_path="C:\jars\englishPCFG.ser.gz")
sentences = parser.parse(("bring me a red ball",)) 
for sentence in sentences:
    sentence    

结果是:

Tree('ROOT', [Tree('S', [Tree('VP', [Tree('VB', ['Bring']),
Tree('NP', [Tree('DT', ['a']), Tree('NN', ['red'])]), Tree('NP',
[Tree('NN', ['ball'])])]), Tree('.', ['.'])])])

除上面的图形外，如何使用斯坦福解析器获取类型化的依赖关系?像这样:

How can I use the Stanford parser to get typed dependencies in addition to the above graph? Something like:

1. root(ROOT-0，带1)
2. iobj(bring-1，me-2)
3. det(ball-5，a-3)
4. amod(球5，红色4)
5. dobj(bring-1，ball-5)

推荐答案

NLTK的StanfordParser模块没有(当前)将树包装为Stanford Dependencies转换代码.您可以使用我的库 PyStanfordDependencies ，它包装了依赖转换器.

NLTK's StanfordParser module doesn't (currently) wrap the tree to Stanford Dependencies conversion code. You can use my library PyStanfordDependencies, which wraps the dependency converter.

如果问题代码段中的nltk_tree是sentence，则此方法有效:

If nltk_tree is sentence from the question's code snippet, then this works:

#!/usr/bin/python3
import StanfordDependencies

# Use str() to convert the NLTK tree to Penn Treebank format
penn_treebank_tree = str(nltk_tree) 

sd = StanfordDependencies.get_instance(jar_filename='point to Stanford Parser JAR file')
converted_tree = sd.convert_tree(penn_treebank_tree)

# Print Typed Dependencies
for node in converted_tree:
    print('{}({}-{},{}-{})'.format(
            node.deprel,
            converted_tree[node.head - 1].form if node.head != 0 else 'ROOT',
            node.head,
            node.form,
            node.index))

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