将 NLTK 块转换为字典列表

Question

我需要从下面的示例 nltk 树中获取字典列表：

   (S
      I/PRP
      'll/MD
      have/VB
      (amount 1/CD)
      (plate pizza/NN)
      and/CC
      (amount 4/CD)
      (plate sandwiches/NNS))

想要的输出如下

  [{amount: 1, plate: pizza}, {amount: 4, plate: sandwiches}]

我试过下面的代码，但我只得到一个字典列表： [{数量：4，盘子：三明治}] 看起来列表没有附加新条目，它只更新相同的字典。

import nltk
from nltk.chunk import *
from nltk.chunk.util import *
from nltk.chunk.regexp import *
from nltk import Tree

training = []
hmm_tagger = HiddenMarkovModelTagger.train(training)
sentence = "I'll have 1 pizza and 4 sandwiches"
gram = r"""
plate:      {<NN|NNS>}                    
amount:    {<CD|DT>}
        """
cp = nltk.RegexpParser(gram)
for sent in sentence:
    tokens = nltk.word_tokenize(sent)
    taggex = hmm_tagger.tag(tokens)
treee = cp.parse(taggex)
iob_ts = tree2conlltags(treee)
tree = conlltags2tree(iob_ts)
def conversion(tree):
    dlist = []
    for leaf in tree:
        if type(leaf) == tuple:
            for leaf in tree:
                key = leaf.label()
                value = leaf[0][0]
                dlist =[dict(zip(key, value)) for leaf in tree]              
    return dlist

Answer 1

这里的主要问题是您没有在 conversion 函数内外的每个循环迭代后追加。

from nltk.chunk.regexp import RegexpParser
from nltk import Tree, pos_tag
from nltk.tokenize import word_tokenize, sent_tokenize

gram = r"""
plate:      {<NN|NNS>}                    
amount:    {<CD|DT>}
"""
cp = RegexpParser(gram)

text = "I'll have 1 pizza and 4 sandwiches"

def conversion(tree):
    dlist = []
    d = dict()
    for item in tree:
        if isinstance(item, Tree):
            d[item.label()] = ' '.join([l[0] for l in item.leaves()])
        else:
            dlist.append(d) if len(d)>0 else None
            d = dict()
    dlist.append(d) if len(d)>0 else None
    return dlist

parsed_text = [cp.parse(pos_tag(word_tokenize(sent)))
               for sent in sent_tokenize(text)]

for tree in parsed_text:
    print(conversion(tree))
#[{'amount': '1', 'plate': 'pizza'}, {'amount': '4', 'plate': 'sandwiches'}]

将 NLTK 块转换为字典列表

Converting NLTK chunks to a list of dictionaries

python

dictionary

tree

nltk

chunking