[英]concordance for a phrase using NLTK in Python
是否有可能在NLTK中獲得一個短語的一致性?
import nltk
from nltk.corpus import PlaintextCorpusReader
corpus_loc = "c://temp//text//"
files = ".*\.txt"
read_corpus = PlaintextCorpusReader(corpus_loc, files)
corpus = nltk.Text(read_corpus.words())
test = nltk.TextCollection(corpus_loc)
corpus.concordance("claim")
例如上面的回報
on okay okay okay i can give you the claim number and my information and
decide on the shop okay okay so the claim number is xxxx - xx - xxxx got
現在,如果我嘗試使用corpus.concordance("claim number")
它不起作用...我確實有這樣的代碼,只需使用.partition()
方法和一些進一步的編碼...但我我想知道是否可以使用concordance
來做同樣的事情。
根據這個問題 ,使用concordance()
函數搜索多個單詞是不可能的。
如果您在@ b3000挖出的問題下閱讀討論,您會看到奇怪的,多字一致性實際上是可用的 - 但只能在圖形一致性工具中,您可以像這樣啟動:
>>> from nltk.app import concordance
>>> concordance()
我把這個解決方案聯系在一起......
def n_concordance_tokenised(text,phrase,left_margin=5,right_margin=5):
#concordance replication via https://simplypython.wordpress.com/2014/03/14/saving-output-of-nltk-text-concordance/
phraseList=phrase.split(' ')
c = nltk.ConcordanceIndex(text.tokens, key = lambda s: s.lower())
#Find the offset for each token in the phrase
offsets=[c.offsets(x) for x in phraseList]
offsets_norm=[]
#For each token in the phraselist, find the offsets and rebase them to the start of the phrase
for i in range(len(phraseList)):
offsets_norm.append([x-i for x in offsets[i]])
#We have found the offset of a phrase if the rebased values intersect
#--
# http://stackoverflow.com/a/3852792/454773
#the intersection method takes an arbitrary amount of arguments
#result = set(d[0]).intersection(*d[1:])
#--
intersects=set(offsets_norm[0]).intersection(*offsets_norm[1:])
concordance_txt = ([text.tokens[map(lambda x: x-left_margin if (x-left_margin)>0 else 0,[offset])[0]:offset+len(phraseList)+right_margin]
for offset in intersects])
outputs=[''.join([x+' ' for x in con_sub]) for con_sub in concordance_txt]
return outputs
def n_concordance(txt,phrase,left_margin=5,right_margin=5):
tokens = nltk.word_tokenize(txt)
text = nltk.Text(tokens)
return
n_concordance_tokenised(text,phrase,left_margin=left_margin,right_margin=right_margin)
n_concordance_tokenised(text1,'monstrous size')
>> [u'one was of a most monstrous size . ... This came towards ',
u'; for Whales of a monstrous size are oftentimes cast up dead ']
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