class NGramCounter(object):
"""
Takes as input a corpus, and then updates an internal frequency with
word counts from the corpus.
"""
def __init__(self, corpus, N=1):
self.corpus = corpus
self.frequency = Frequency()
self.N = N
def words(self):
"""
A generator that goes through all the words in the corpus, makes
them lowercase and (possibly) could remove punctuation or stopwords
"""
for reader in self.corpus:
for word in reader.words():
word = word.strip()
if word:
yield word.lower()
def __iter__(self):
"""
Expects a generator to return the specific ngram to save in the
frequency counts.
"""
if self.N == 1:
# Special case for Unigrams
for word in self.words():
yield word
else:
ngram = []
for word in self.words():
if len(ngram) < self.N:
ngram.append(word)
if len(ngram) == self.N:
yield tuple(ngram)
ngram = ngram[1:]
def count(self):
if not self.frequency:
for ngram in self:
self.frequency.increment(ngram)
return self.frequency
class NGramCounter(object):
"""
Takes as input a corpus, and then updates an internal frequency with
word counts from the corpus.
"""
def __init__(self, corpus, N=1):
self.corpus = corpus
self.frequency = Frequency()
self.N = N
def words(self):
"""
A generator that goes through all the words in the corpus, makes
them lowercase and (possibly) could remove punctuation or stopwords
"""
for reader in self.corpus:
for word in reader.words():
word = word.strip()
if word:
yield word.lower()
def __iter__(self):
"""
Expects a generator to return the specific ngram to save in the
frequency counts.
"""
if self.N == 1:
# Special case for Unigrams
for word in self.words(): yield word
else:
ngram = []
for word in self.words():
if len(ngram) < self.N:
ngram.append(word)
if len(ngram) == self.N:
yield tuple(ngram)
ngram = ngram[1:]
def count(self):
if not self.frequency:
for ngram in self:
self.frequency.increment(ngram)
return self.frequency
def __init__(self, corpus, N=1):
self.corpus = corpus
self.frequency = Frequency()
self.N = N
def __init__(self, corpus, N=1):
self.corpus = corpus
self.frequency = Frequency()
self.N = N
