def repeated_item_probability(self, item, category):
item_feature_count = Counter(get_words(item))
p = 1.
for f, c in item_feature_count.iteritems():
# this doesn't make sense unless you're trying to compare the probabilities for numerouse vs single occurences of a feature
p *= pow(self.weighted_feature_probability(f, category), c)
return p
def repeated_item_probability(self, item, category):
item_feature_count = Counter(get_words(item))
p = 1.
for f, c in item_feature_count.iteritems():
# this doesn't make sense unless you're trying to compare the probabilities for numerouse vs single occurences of a feature
p *= pow(self.weighted_feature_probability(f, category), c)
return p
def append_document(self, doc, wordlist=None):
"""Add a column to the occurence matrix representing the word counts in a single document"""
if isinstance(doc, basestring):
doc = Counter(get_words(doc))
if not isinstance(doc, Mapping) and len(doc) <= len(wordlist):
doc = dict(zip(doc, wordlist[:len(doc)]))
iptr = self.matrix.indptr.tolist()
num_docs = self.matrix.shape[1]
self.matrix = csr_matrix((self.matrix.data, self.matrix.indices, iptr + [iptr[-1]]),
shape=(len(self.words), num_docs + 1), dtype='int64')
for word, count in doc.iteritems():
self.matrix[self.word_index(word), num_docs] = count
def append_document(self, doc, wordlist=None):
"""Add a column to the occurence matrix representing the word counts in a single document"""
if isinstance(doc, basestring):
doc = Counter(get_words(doc))
if not isinstance(doc, Mapping) and len(doc) <= len(wordlist):
doc = dict(zip(doc, wordlist[:len(doc)]))
iptr = self.matrix.indptr.tolist()
num_docs = self.matrix.shape[1]
self.matrix = csr_matrix(
(self.matrix.data, self.matrix.indices, iptr + [iptr[-1]]),
shape=(len(self.words), num_docs + 1),
dtype='int64')
for word, count in doc.iteritems():
self.matrix[self.word_index(word), num_docs] = count
#!/usr/bin/env python
from collections import defaultdict, Counter
# count[0] = 1-gram counts
# count[1] = 2-gram counts
count = defaultdict(int)
fish_count = Counter({'carp': 10, 'eel': 1, 'perch': 3, 'trout': 1, 'salmon': 1, 'perch': 3, 'whitefish': 2})
fish = list(fish_count)
count.update(fish)
from pug.nlp.util import get_words
s = ' '.join(fish)
count = [Counter(get_words(s))]
class Classifier:
def __init__(self, get_features=get_words, s='', path=''):
self.get_features = get_features
# TODO: use a defaultdict everywhere a dict is used
self.feature_count = Counter()
self.category_count = defaultdict(Counter) # dict of Counters, count of documents binned in each category
self.num_items = 0
def increment_feature(self, feature, category):
"Increase the count for a feature<->category association"
self.feature_count[feature] += Counter((feature,))
# self.feature_count.setdefault(feature, Counter())
# self.feature_count[feature].setdefault(category, 0)
# self.feature_count[feature][category] += 1
fish_count = Counter({
'carp': 10,
'eel': 1,
'perch': 3,
'trout': 1,
'salmon': 1,
'perch': 3,
'whitefish': 2
})
fish = list(fish_count)
count.update(fish)
from pug.nlp.util import get_words
s = ' '.join(fish)
count = [Counter(get_words(s))]
class Classifier:
def __init__(self, get_features=get_words, s='', path=''):
self.get_features = get_features
# TODO: use a defaultdict everywhere a dict is used
self.feature_count = Counter()
self.category_count = defaultdict(
Counter
) # dict of Counters, count of documents binned in each category
self.num_items = 0
def increment_feature(self, feature, category):
"Increase the count for a feature<->category association"
self.feature_count[feature] += Counter((feature, ))
def item_probability(self, item, category):
item_features = set(get_words(item))
p = 1.
for f in item_features:
p *= self.weighted_feature_probability(f, category)
return p
def item_probability(self, item, category):
item_features = set(get_words(item))
p = 1.
for f in item_features:
p *= self.weighted_feature_probability(f, category)
return p
