10

我有一些文字:

 s="Imageclassificationmethodscan beroughlydividedinto two broad families of approaches:"

我想将其解析为单个单词。我迅速查看了附魔和 nltk,但没有看到任何看起来立即有用的东西。如果我有时间在这方面进行投资,我会考虑编写一个动态程序,该程序具有 enchant 检查单词是否为英文的能力。我本来以为网上会有这样的事情,我错了吗?

4

2 回答 2

9

使用 trie 的贪婪方法

使用Biopython ( )试试这个pip install biopython

from Bio import trie
import string


def get_trie(dictfile='/usr/share/dict/american-english'):
    tr = trie.trie()
    with open(dictfile) as f:
        for line in f:
            word = line.rstrip()
            try:
                word = word.encode(encoding='ascii', errors='ignore')
                tr[word] = len(word)
                assert tr.has_key(word), "Missing %s" % word
            except UnicodeDecodeError:
                pass
    return tr


def get_trie_word(tr, s):
    for end in reversed(range(len(s))):
        word = s[:end + 1]
        if tr.has_key(word): 
            return word, s[end + 1: ]
    return None, s

def main(s):
    tr = get_trie()
    while s:
        word, s = get_trie_word(tr, s)
        print word

if __name__ == '__main__':
    s = "Imageclassificationmethodscan beroughlydividedinto two broad families of approaches:"
    s = s.strip(string.punctuation)
    s = s.replace(" ", '')
    s = s.lower()
    main(s)

结果

>>> if __name__ == '__main__':
...     s = "Imageclassificationmethodscan beroughlydividedinto two broad families of approaches:"
...     s = s.strip(string.punctuation)
...     s = s.replace(" ", '')
...     s = s.lower()
...     main(s)
... 
image
classification
methods
can
be
roughly
divided
into
two
broad
families
of
approaches

注意事项

英语中有一些退化的情况,这是行不通的。您需要使用回溯来处理这些问题,但这应该可以帮助您入门。

强制性测试

>>> main("expertsexchange")
experts
exchange
于 2013-03-12T17:00:50.377 回答
1

这是亚洲 NLP 中经常出现的问题。如果你有字典,那么你可以使用这个http://code.google.com/p/mini-segmenter/(免责声明:我写的,希望你不介意)。

请注意,搜索空间可能非常大,因为字母英文中的字符数肯定比音节中文/日文长。

于 2013-03-13T22:25:32.813 回答