split sentence without space in python (nltk?)

问题

I have a set of concatenated word and i want to split them into arrays

For example :

split_word("acquirecustomerdata")
=> ['acquire', 'customer', 'data']

I found pyenchant, but it's not available for 64bit windows.

Then i tried to split each string into sub string and then compare them to wordnet to find a equivalent word. For example :

from nltk import wordnet as wn
def split_word(self, word):
    result = list()
    while(len(word) > 2):
        i = 1
        found = True
        while(found):
            i = i + 1
            synsets = wn.synsets(word[:i])
            for s in synsets:
                if edit_distance(s.name().split('.')[0], word[:i]) == 0:
                    found = False
                    break;
        result.append(word[:i])
        word = word[i:]
   print(result)

But this solution is not sure and is too long. So I'm looking for your help.

Thank you

回答1:

Check - Word Segmentation Task from Norvig's work.

from __future__ import division
from collections import Counter
import re, nltk

WORDS = nltk.corpus.brown.words()
COUNTS = Counter(WORDS)

def pdist(counter):
    "Make a probability distribution, given evidence from a Counter."
    N = sum(counter.values())
    return lambda x: counter[x]/N

P = pdist(COUNTS)

def Pwords(words):
    "Probability of words, assuming each word is independent of others."
    return product(P(w) for w in words)

def product(nums):
    "Multiply the numbers together.  (Like `sum`, but with multiplication.)"
    result = 1
    for x in nums:
        result *= x
    return result

def splits(text, start=0, L=20):
    "Return a list of all (first, rest) pairs; start <= len(first) <= L."
    return [(text[:i], text[i:]) 
            for i in range(start, min(len(text), L)+1)]

def segment(text):
    "Return a list of words that is the most probable segmentation of text."
    if not text: 
        return []
    else:
        candidates = ([first] + segment(rest) 
                      for (first, rest) in splits(text, 1))
        return max(candidates, key=Pwords)

print segment('acquirecustomerdata')
#['acquire', 'customer', 'data']

For better solution than this you can use bigram/trigram.

More examples at : Word Segmentation Task

回答2:

If you have a list of all possible words, you can use something like this:

import re

word_list = ["go", "walk", "run", "jump"]  # list of all possible words
pattern = re.compile("|".join("%s" % word for word in word_list))

s = "gowalkrunjump"
result = re.findall(pattern, s)

来源：https://stackoverflow.com/questions/38125281/split-sentence-without-space-in-python-nltk

标签

python

nltk

spell-checking

wordnet