python - 使用 Porter Stemmer 时出现 NLTK 导入错误

Question

我正在导入 nltk，但出现以下错误。

Traceback (most recent call last):
  File "/home/control/Work/Intelligence/Datasets/whats cooking/new.py", line 4, in <module>
    import nltk
  File "/usr/local/lib/python2.7/dist-packages/nltk-3.0.5-py2.7.egg/nltk/__init__.py", line 137, in <module>
    from nltk.stem import *
  File "/usr/local/lib/python2.7/dist-packages/nltk-3.0.5-py2.7.egg/nltk/stem/__init__.py", line 29, in <module>
    from nltk.stem.snowball import SnowballStemmer
  File "/usr/local/lib/python2.7/dist-packages/nltk-3.0.5-py2.7.egg/nltk/stem/snowball.py", line 25, in <module>
    from nltk.stem import porter
ImportError: cannot import name porter

我的 nltk 几天前运行良好，我没有更新或更改任何内容，并且我还安装了所有 nltk 数据。

Answer 1

NLTK 中 Porter 词干分析器的惯用用法(请参阅 http://www.nltk.org/howto/stem.html)是:

>>> from nltk.stem import PorterStemmer
>>> porter = PorterStemmer()
>>> sent = 'I went on wild geese chases'
>>> porter.stem(sent)
u'I went on wild geese chas'

注意: PorterStemmer 不能很好地处理不规则复数

看一下:

• Stemmers vs Lemmatizers
• lemmatize plural nouns using nltk and wordnet
• Python NLTK Lemmatization of the word 'further' with wordnet