如何使用 nlp 标记句子

Question

我是 NLP 新手。我正在尝试在 python 3 上使用 nlp 标记句子。7.So 我使用了以下代码

import nltk
text4="This is the first sentence.A gallon of milk in the U.S. cost 
.99.Is this the third sentence?Yes,it is!"
x=nltk.sent_tokenize(text4)
x[0]

我原以为 x[0] 会 return 第一句话，但我得到了

Out[4]: 'This is the first sentence.A gallon of milk in the U.S. cost .99.Is this the third sentence?Yes,it is!'

我做错了什么吗？

Answer 1

您的句子中需要有效的空格和标点符号，分词器才能正常运行：

import nltk

text4 = "This is a sentence. This is another sentence."
nltk.sent_tokenize(text4)

# ['This is a sentence.', 'This is another sentence.']

## Versus What you had before

nltk.sent_tokenize("This is a sentence.This is another sentence.")

# ['This is a sentence.This is another sentence.']

Answer 2

NLTK sent_tokenizer 不能很好地处理格式错误的文本。如果您提供适当的间距，那么它就可以工作。

import nltk
nltk.download('punkt')
text4="This is the first sentence. A gallon of milk in the U.S. cost .99. Is this 
the third sentence? Yes, it is"
x=nltk.sent_tokenize(text4)
x[0]

或你可以用这个。

import re
text4 = "This is the first sentence. A gallon of milk in the U.S. cost 2.99. Is this 
the third sentence? Yes it is"
sentences = re.split(r' *[\.\?!][\'"\)\]]* *', text4)
sentences

如何使用 nlp 标记句子

How to tokenize sentence using nlp

python

nlp

tokenize