def gen_disassociated_press(file=KJBIBLE, order=3, len=100):
"""Generate some autocorrelated text."""
tokens = [k for k in tokenize(file) if k.isalpha()]
model = NgramModel(order, tokens, MLEProbDist)
ret = ['',] * (order-1)
for i in range(len):
tail = ret[-(order-1):]
ret.append(model.generate_one(tail))
return ' '.join(ret[(order-1):])
def train_ngram(self, target_data_path, days, kakao_data_path):
results = []
ngramModel = NgramModel(self.dataLoader)
self.dataLoader.ngram_data_loader(days)
self.dataLoader.kakao_data_loader(kakao_data_path)
target_datas = self.dataLoader.target_data_loader(target_data_path)
target_data_len = len(target_datas)
for i, target_data in enumerate(target_datas):
if i % (target_data_len / 100) == 0:
print("{}% 완료".format((i / target_data_len) * 100))
re = ngramModel.detect_rule_recommend(target_data)
results.append(target_data + " " + " ".join(re))
self.dataLoader.write_result(self.write_file_path, results)
def train(train_file):
"""Return the required language models trained from a file."""
unigram = NgramModel(1)
bigram_left = NgramModel(2)
bigram_right = NgramModel(2)
for line in train_file:
tokens = line.rstrip().split()
unigram.update(tokens)
bigram_left.update(tokens)
bigram_right.update(reversed(tokens))
return (unigram, bigram_left, bigram_right)
def _make_models(self, tuples):
self._word_ids = WordIdDictionary()
# Extract sequence of words, lemmas, and tags
words, lemmas, tags = tuple(map(lambda tokens: list(
self._word_ids.add_words_transform(tokens)), zip(*tuples)))
self._tags = tags
# Create models for words, lemmas, and tags
self._words_ngram = NgramModel(words, self._n)
self._lemmas_ngram = NgramModel(lemmas, self._n)
self._tags_ngram = NgramModel(tags, 2 * self._n) # Can afford to use 2 * n-gram size for grammar
# Map tag and (tag, lemma) to valid lemmas and vocabulary, respectively
# It's faster to use a list than predicate on unigrams during backoff search
self._tag_lemmas = ConditionalFreqDist(zip(tags, lemmas))
self._tag_lemma_words = ConditionalFreqDist(
zip(zip(tags, lemmas), words))
def main():
start = time.clock()
#sys.argv[1] is path to training data
#sys.argv[2] is length of n-grams
ngram_model = NgramModel(int(sys.argv[2]), sys.argv[1], pad_right=True)
end = time.clock()
print 'Done computing ngram model, ' + str(end - start) + ' seconds running time'
fileName = sys.argv[2] + 'gramModel' + '_' + sys.argv[1][3:].split('.')[0] + '.p'
pickle.dump(ngram_model, open(fileName, 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
end = time.clock()
print 'Done pickling, ' + str(end - start) + ' seconds running time'
'''
#for unpickling
fileName = sys.argv[2] + 'gramModel' + '_' + sys.argv[1][3:].split('.')[0] + '.p'
restored_model = pickle.load(open(fileName, 'rb'))
#end = time.clock()
#print 'Done unpickling, ' + str(end - start) + ' seconds running time'
'''
print "Generated examples: "
for i in range (200):
#print ' '.join(ngram_model.generate(20, ('', '')))
review = []
context = ['', '']
nextToken = ngram_model._generate_one(context)
while nextToken != '.' and nextToken != '...EOR...' and len(review) < 500:
review.append(nextToken)
context[0] = context[1]
context[1] = nextToken
nextToken = ngram_model._generate_one(context)
print ' '.join(review) + ' len: ' + str(len(review))
def initialize_bot(chars, nicks):
n = 3
# intros = ["So", "Hi", "In fact", "For what it's worth", "Think about it",
# "Conversely", "On the other hand", "Debatably", "Especially", "Not to mention", "Although", "Moreover", "Equally",
# "But", "Yes",
# "See here", "Ultimately", "Rather", "Nevertheless", "As you said", "Mind you", "Even so"]
char_corps = load_corpora(chars)
est = lambda fdist, bins: MLEProbDist(fdist)
# est = lambda fdist, bins: LidstoneProbDist(fdist, 0.2)
# est = lambda fdist, bins: WittenBellProbDist(fdist)
# est = lambda fdist, bins: KneserNeyProbDist(fdist)
models = {character: NgramModel(n, corp, estimator=est)
for character, corp in char_corps.iteritems()}
# return ChatBot(chars, nicks, intros, models, ngram=n, debug=False)
return ChatBot(chars, nicks, models, ngram=n, debug=False)
def viterbi(self,sentence, order):
tokenizer = RegexpTokenizer(r'[\w\']+')
self.token_words = tokenizer.tokenize(sentence)
#self.token_words = word_tokenize(sentence)
self.nngram = NgramModel(order, [ word.lower() for word in brown.words()], estimator)
self.N = len(self.token_words)
MAX_OFFSET = 10
if order == 2:
viterbiM = np.zeros((self.N + MAX_OFFSET, self.M + 2), dtype = 'double')
words = np.zeros((self.N + MAX_OFFSET, self.M + 2), dtype = object)
backpointer = np.zeros( ( self.N + MAX_OFFSET, self.M + 2), dtype = 'int32')
offset = np.zeros( self.N, dtype = 'int32' )
return self.viterbi_first_order(viterbiM, words, backpointer, offset)
if order == 3:
viterbiM = np.zeros((self.N + MAX_OFFSET, self.M + 2, self.M + 2), dtype = 'double')
words = np.zeros((self.N + MAX_OFFSET, self.M + 2), dtype = object)
backpointer = np.zeros( ( self.N + MAX_OFFSET, self.M + 2, self.M + 2), dtype = 'int32')
offset = np.zeros( self.N, dtype = 'int32' )
return self.viterbi_second_order(viterbiM, words, backpointer, offset)
def _make_models(self, tuples):
self._word_ids = WordIdDictionary()
# Extract sequence of words, lemmas, and tags
words, lemmas, tags = tuple(
map(
lambda tokens: list(self._word_ids.add_words_transform(tokens)
), zip(*tuples)))
self._tags = tags
# Create models for words, lemmas, and tags
self._words_ngram = NgramModel(words, self._n)
self._lemmas_ngram = NgramModel(lemmas, self._n)
self._tags_ngram = NgramModel(
tags, 2 * self._n) # Can afford to use 2 * n-gram size for grammar
# Map tag and (tag, lemma) to valid lemmas and vocabulary, respectively
# It's faster to use a list than predicate on unigrams during backoff search
self._tag_lemmas = ConditionalFreqDist(zip(tags, lemmas))
self._tag_lemma_words = ConditionalFreqDist(
zip(zip(tags, lemmas), words))
if __name__ == "__main__":
if len(sys.argv) < 2:
print "Usage: %s <corpus-root> <tweets-file>" % (sys.argv[0])
sys.exit(1)
corpus_root = sys.argv[1]
estimator = lambda fdist, bins: LidstoneProbDist(fdist, 0.2)
ignored_words = nltk.corpus.stopwords.words('english')
pos_movie_reviews = PlaintextCorpusReader(corpus_root + "/pos", ".*\.txt")
neg_movie_reviews = PlaintextCorpusReader(corpus_root + "/neg", ".*\.txt")
print "Corpora built."
pos_unigram_lm = NgramModel(1, pos_movie_reviews.words(), estimator)
print "Positive unigram model complete."
pos_bigram_lm = NgramModel(2, pos_movie_reviews.words(), estimator)
print "Positive bigram model complete."
#pos_trigram_lm = NgramModel(3, pos_movie_reviews.words(), estimator)
neg_unigram_lm = NgramModel(1, neg_movie_reviews.words(), estimator)
print "Negative unigram model complete."
neg_bigram_lm = NgramModel(2, neg_movie_reviews.words(), estimator)
print "Negative bigram model complete."
#neg_trigram_lm = NgramModel(3, neg_movie_reviews.words(), estimator)
#read in the tweets
tweets = []
tokenizer = utils.Tokenizer()
class HMM(object):
def __init__(self, matrixE):
self.matrixE = matrixE
self.M = 20
self.nngram = None
self.word_dict_path = '../data/word_by_len'
self.word_dict = {}
self.load_word_dict()
self.ppservers=("localhost", )
self.threshold = 0.00000001
self.job_server = pp.Server(ppservers= self.ppservers)
print "active nodes: ", self.job_server.get_active_nodes()
#self.trigram = NgramModel(3, brown.words(), estimator)
def load_word_dict(self):
for i in xrange(1,24):
with open("%s/%d.txt"%(self.word_dict_path, i), 'r') as fd:
self.word_dict[i] = [line.strip().lower() for line in fd.readlines()]
def segment(self, word):
prob_max = 0.0
first, second = [],[]
special_char = [',','.','\'', ' ', '\n']
for c in xrange(1,len(word)-1):
first_cur = self.most_similar_words(word[:c])
second_cur = self.most_similar_words(word[(c+1):])
for (key1, val1) in first_cur:
for (key2, val2) in second_cur:
prob = val1 * val2 * max( [ self.matrixE[charToNum(sc)][charToNum(word[c])] for sc in special_char ])
if prob > prob_max:
prob_max = prob
LOG( log_file, '(%s, %d, %f, %s, %s)\n' %(word, c, prob_max, key1, key2))
first = first_cur
second = second_cur
return first, second, prob_max
def viterbi(self,sentence, order):
tokenizer = RegexpTokenizer(r'[\w\']+')
self.token_words = tokenizer.tokenize(sentence)
#self.token_words = word_tokenize(sentence)
self.nngram = NgramModel(order, [ word.lower() for word in brown.words()], estimator)
self.N = len(self.token_words)
MAX_OFFSET = 10
if order == 2:
viterbiM = np.zeros((self.N + MAX_OFFSET, self.M + 2), dtype = 'double')
words = np.zeros((self.N + MAX_OFFSET, self.M + 2), dtype = object)
backpointer = np.zeros( ( self.N + MAX_OFFSET, self.M + 2), dtype = 'int32')
offset = np.zeros( self.N, dtype = 'int32' )
return self.viterbi_first_order(viterbiM, words, backpointer, offset)
if order == 3:
viterbiM = np.zeros((self.N + MAX_OFFSET, self.M + 2, self.M + 2), dtype = 'double')
words = np.zeros((self.N + MAX_OFFSET, self.M + 2), dtype = object)
backpointer = np.zeros( ( self.N + MAX_OFFSET, self.M + 2, self.M + 2), dtype = 'int32')
offset = np.zeros( self.N, dtype = 'int32' )
return self.viterbi_second_order(viterbiM, words, backpointer, offset)
def most_similar_words_with_split(self,word):
states = self.most_similar_words(word)
# If the probability is too small , it's possible that space is recognized as character
states_tmp = []
if states[0][1] < self.threshold:
LOG(log_file, "Beyond bottom threshold, try to split %s\n"%word)
states1, states2, prob = self.segment(word)
if prob > states[0][1]:
states_tmp.append(states1)
states_tmp.append(states2)
splited = True
else:
states_tmp.append(states)
else:
states_tmp.append(states)
return states_tmp
def viterbi_first_order(self,viterbiM, words, backpointer, offset):
print 'call_bigram'
for i, word in enumerate(self.token_words):
# Find matched word by probability
splited = False
starttime = int(time())
print 'finding similar words(%s)'%word
states_tmp = self.most_similar_words_with_split(word)
print states_tmp
find_time = int(time()) - starttime
# initial current offset
cur_offset = 0
if i != 0:
cur_offset = offset[i-1]
# recursion step
print 'iterate states'
for index, st in enumerate(states_tmp):
id_with_offset = cur_offset + index + i
for j, (state, prob) in enumerate(st):
# print something out for debuging
if j < 10:
LOG(log_file, '%s, %f\n'%( state, prob ))
print state,prob
words[i][j+1] = state
if i == 0:
pref = [u' ']
viterbiM[id_with_offset][j+1] = self.nngram.prob(state, pref)*prob
backpointer[id_with_offset][j+1] = 0
else:
l_tmp = max(enumerate([
viterbiM[id_with_offset - 1 ][k+1]
*self.nngram.prob(state, [ str(words[id_with_offset - 1 ][k+1]) ])
* prob
for k in xrange(self.M)
]),
key = operator.itemgetter(1)
)
backpointer[id_with_offset][j+1] , viterbiM[id_with_offset][j+1] = l_tmp
if splited:
offset[i] = cur_offset + 1
LOG( log_file, "Eclapse %d s matching most possible word (%s),"
"eclapse %d s for viterbi...\n"
%(find_time, word , int(time()) - starttime - find_time))
final_offset = offset[-1]
print 'final offset is %d'%final_offset
# termination step
l = [
viterbiM[self.N + final_offset - 1][k+1]
*self.endOfSentence(self.nngram, [ words[self.N + final_offset - 1][k+1] ])
for k in xrange(self.M)
]
backpointer[self.N + final_offset - 1][self.M+1], viterbiM[self.N + final_offset - 1][self.M + 1] = max(enumerate(l), key = operator.itemgetter(1))
# backtrace
path=[]
end = backpointer[self.N + final_offset - 1][self.M+1]
for i in xrange(self.N + final_offset - 1, 0, -1):
path.append(end)
end = backpointer[i][end+1]
path.append(end)
word_vector = []
for i in xrange(self.N + final_offset -1, -1, -1):
word_vector.append(words[self.N + final_offset -1 - i][path[i]+1])
return word_vector
def viterbi_second_order(self,viterbiM, words, backpointer, offset):
for i, word in enumerate(self.token_words):
# Find matched word by probability
starttime = int(time())
splited = False
states_tmp = self.most_similar_words_with_split(word)
find_time = int(time()) - starttime
# initial current offset
cur_offset = 0
if i != 0:
cur_offset = offset[i-1]
# recursion step
for index, st in enumerate(states_tmp):
id_with_offset = cur_offset + index + i
for j, (state, prob) in enumerate(st):
# print something out for debuging
if j < 20:
LOG(log_file, '%s, %f\n'%( state, prob ))
print state,prob
words[i][j+1] = state
for l in xrange(self.M):
if i == 0:
pref = [u' ']
viterbiM[id_with_offset][l+1][j+1] = self.nngram.prob(state, pref)*prob
backpointer[id_with_offset][l+1][j+1] = 0
elif i == 1:
backpointer[id_with_offset][l+1][j+1] , viterbiM[id_with_offset][l+1][j+1] = max(enumerate([
viterbiM[id_with_offset - 1 ][k+1][l+1]
*self.nngram.prob(state, [
' ',
str(words[id_with_offset - 1][l+1]) ])
* prob
for k in xrange(self.M)
]),
key = operator.itemgetter(1)
)
else:
backpointer[id_with_offset][l+1][j+1] , viterbiM[id_with_offset][l+1][j+1] = max(enumerate([
viterbiM[id_with_offset - 1 ][k+1][l+1]
*self.nngram.prob(state, [
str(words[id_with_offset - 2 ][k+1]),
str(words[id_with_offset - 1][l+1]) ])
* prob
for k in xrange(self.M)
]),
key = operator.itemgetter(1)
)
if splited:
offset[i] = cur_offset + 1
LOG( log_file, "Eclapse %d s matching most possible word (%s),"
"eclapse %d s for viterbi...\n"
%(find_time, word , int(time()) - starttime - find_time))
final_offset = offset[-1]
print 'final offset is %d'%final_offset
# termination step
for l in xrange(self.M):
backpointer[self.N + final_offset - 1][l+1][self.M+1],viterbiM[self.N + final_offset - 1][l + 1][self.M+1] = max(enumerate([
viterbiM[self.N + final_offset - 1][k+1][l+1]
*self.endOfSentence(self.nngram, [ str(words[self.N + final_offset - 2][k+1])
, str(words[self.N + final_offset - 1][l+1]) ])
for k in xrange(self.M)
]),
key = operator.itemgetter(1))
backpointer[self.N + final_offset - 1][self.M+1][self.M+1],viterbiM[self.N + final_offset - 1][self.M+1][self.M+1] = max(enumerate([
viterbiM[self.N + final_offset - 1][k+1][self.M+1]
*self.endOfSentence(self.nngram, [ str(words[self.N + final_offset - 1][k+1]) ])
for k in xrange(self.M)
]),
key = operator.itemgetter(1))
# backtrace
import pdb
pdb.set_trace()
path=[]
end = backpointer[self.N + final_offset - 1][self.M+1][self.M+1]
path.append(end)
last_end = backpointer[self.N + final_offset - 1][end][self.M+1]
path.append(last_end)
for i in xrange(self.N + final_offset - 1, 1, -2):
end = backpointer[i][last_end+1][end + 1]
last_end = backpointer[i-1][end + 1][last_end + 1]
path.append(end)
path.append(last_end)
path.append(end)
print path
word_vector = []
for i in xrange(self.N + final_offset -1, -1, -1):
word_vector.append(words[self.N + final_offset -1 - i][path[i]+1])
print word_vector
return word_vector
def endOfSentence(self, lm, word):
prob = 0
for separator in [',', '.']:
prob += lm.prob(separator, word)
return prob
def most_similar_words(self, word):
prob_list = {}
jobs = self.paralize(word)
prob_list.update(jobs)
sorted_prob = sorted(
prob_list.items(),
key = operator.itemgetter(1),
reverse=True
)
return sorted_prob[:self.M]
def paralize(self, word):
parts = 17
jobs = []
for index in xrange(parts):
for i in xrange(3):
if i == 1:
punish = 1
else:
punish = 0.05
length = len(word) + i - 1
if length <= 0:
_list = []
else:
_list = split_dict(self.word_dict[length], length, parts - 1, index)
jobs.append(
self.job_server.submit(
populate_prob,
(_list, self.matrixE, unigram, length, word, {}, substitue, punish,),
(substitue, insert, delete, probaWord, weightedPopularity, charToNum,),
("nltk",)
)
)
self.job_server.wait()
stats = {}
for job in jobs:
stats.update(job())
#self.job_server.print_stats()
return stats
def train(self, train_path):
"""Train based on co-occurences in the provided data."""
term_symbols = []
# Process input
with open(train_path, "Ur") as train_file:
for line in train_file:
line_symbols = line.split()
# Learn co-occurences and precedes/follows
for idx, sym1 in enumerate(line_symbols):
# Count the symbol
self.counts[sym1] += 1
# Get the sets of the other items
preceding_symbols = set(line_symbols[:idx])
following_symbols = set(line_symbols[idx + 1:])
other_symbols = preceding_symbols | following_symbols
# Count cooccurences
for sym2 in other_symbols:
self.cooccurs[sym1][sym2] += 1
# Mark before/after
for sym2 in preceding_symbols:
self.before[sym1].add(sym2)
for sym2 in following_symbols:
self.after[sym1].add(sym2)
# Remove if one of the always relationships does
# not hold up
for sym2 in SYMBOLS:
if sym2 not in preceding_symbols:
try:
self.mustprecede[sym1].remove(sym2)
except KeyError:
pass
if sym2 not in following_symbols:
try:
self.mustfollow[sym1].remove(sym2)
except KeyError:
pass
# Add beginning and end terminators for n-grams
term_symbols.extend([START_SYM] + line_symbols + [END_SYM])
# Learn
# Requires/excludes and precedes/follows
for sym1 in SYMBOLS:
for sym2 in SYMBOLS:
# Co-occurence counts imply requires/excludes
count1 = self.counts[sym1]
if self.cooccurs[sym1][sym2] == count1:
self.requires[sym1].add(sym2)
elif self.cooccurs[sym1][sym2] == 0:
self.excludes[sym1].add(sym2)
# Figure out what cannot precede/follow
if sym2 not in self.before[sym1]:
self.noprecede[sym1].add(sym2)
if sym2 not in self.after[sym1]:
self.nofollow[sym1].add(sym2)
# N-gram model
self.ngram = NgramModel(2, term_symbols)
class LVGNgramGenerator:
"""
Lemmatized vocabulary and grammar ngram-based generator
"""
def __init__(self, tuples, n):
"""
Parameters
----------
tuples : Iterable[(str, str, str)]
A list of (word, lemma, tag) tuples from which to learn a model
n : int
Maximum size of n-grams to use in NgramModel
"""
self._n = n
print("Creating models... (this may take some time)");
self._make_models(tuples)
print("Done!");
def _make_models(self, tuples):
self._word_ids = WordIdDictionary()
# Extract sequence of words, lemmas, and tags
words, lemmas, tags = tuple(map(lambda tokens: list(
self._word_ids.add_words_transform(tokens)), zip(*tuples)))
self._tags = tags
# Create models for words, lemmas, and tags
self._words_ngram = NgramModel(words, self._n)
self._lemmas_ngram = NgramModel(lemmas, self._n)
self._tags_ngram = NgramModel(tags, 2 * self._n) # Can afford to use 2 * n-gram size for grammar
# Map tag and (tag, lemma) to valid lemmas and vocabulary, respectively
# It's faster to use a list than predicate on unigrams during backoff search
self._tag_lemmas = ConditionalFreqDist(zip(tags, lemmas))
self._tag_lemma_words = ConditionalFreqDist(
zip(zip(tags, lemmas), words))
def generate_without_pos(self, n):
"""
Generate n words without using any special POS information
"""
# Just use words NgramModel generate function
generated_words = self._words_ngram.generate(n)
return list(self._word_ids.transform_ids(generated_words))
def generate(self, n):
"""
Generate n words using copied grammar, generated lemmas, and words based on lemmas
"""
start = random.randint(n, len(self._tags) - n)
generated_tags = self._tags[start : start + n] # Copy a random section of POS tags for grammar
# Generate sequence of lemmas based off of grammar
generated_lemmas = []
for tag in generated_tags:
# Search for and choose a lemma with correct tag
choice = self._lemmas_ngram.choose_word(
generated_lemmas, backoff_limit=2, predicate=lambda lemma: lemma in self._tag_lemmas[tag])
if choice is None:
# Could not find a good lemma for current POS tag, choose from list
choice = MLEProbDist(self._tag_lemmas[tag]).generate()
generated_lemmas.append(choice)
# Generate sequence of words based off of lemmas and grammar
generated_words = []
for (tag, lemma) in zip(generated_tags, generated_lemmas):
# Search for and choose word with correct lemma/tag
choices = self._words_ngram.backoff_search(
generated_words, backoff_limit=2, predicate=lambda word: word in self._tag_lemma_words[(tag, lemma)])
if choices is None:
# Could not find a good word, choose from list
choices = self._tag_lemma_words[(tag, lemma)]
generated_words.append(MLEProbDist(choices).generate())
return list(self._word_ids.transform_ids(generated_words))
def generate_alternative(self, n):
"""
Generate n words using a more complicated algorithm
"""
generated_tags = []
generated_lemmas = []
generated_words = []
# Incrementally generate (tag, lemma) pairs
for i in range(n):
tag_choice = None # Start with nothing
# Loop through n-grams of grammar
size = 2 * self._n
while size > 2:
tag_choices = self._tags_ngram.backoff_search(
generated_tags, backoff_limit=2, predicate=lambda tag: True, start_n=size)
# Determine valid lemmas in context with these tag choices
tag_to_lemma = {}
if tag_choices is not None:
for tag, _ in tag_choices.items():
# For each tag, find valid lemmas in context with that tag
lemma = self._lemmas_ngram.choose_word(
generated_lemmas, backoff_limit=2, predicate=lambda lemma: lemma in self._tag_lemmas[tag])
if lemma is not None:
tag_to_lemma[tag] = lemma
if len(tag_to_lemma) > 1:
# We have found valid (tag, lemma) pairs
tag_probdist = MLEProbDist(FreqDist(
{tag: freq for tag, freq in tag_choices.items() if tag in tag_to_lemma}))
tag_choice = tag_probdist.generate() # Randomly select the tag
lemma_choice = tag_to_lemma[tag_choice] # Set the lemma
break
size -= 1 # Lower to smaller n-gram for more tag choices
if tag_choice is None:
# We still didn't find a valid (tag, lemma) pair, fallback
tag_choice = MLEProbDist(tag_choices).generate()
lemma_choice = MLEProbDist(
self._tag_lemmas[tag_choice]).generate()
generated_tags.append(tag_choice)
generated_lemmas.append(lemma_choice)
# Generate all words based on (tag, lemma) pairs
for (tag, lemma) in zip(generated_tags, generated_lemmas):
# Search for and choose word with correct lemma/tag
choices = self._words_ngram.backoff_search(
generated_words, backoff_limit=2, predicate=lambda word: word in self._tag_lemma_words[(tag, lemma)])
if choices is None:
# Could not find a good word, choose from list
choices = self._tag_lemma_words[(tag, lemma)]
generated_words.append(MLEProbDist(choices).generate())
return list(self._word_ids.transform_ids(generated_words))
def test_model(n, inits):
ngram = NgramModel(n, brown.words(), selector)
with open("out" + str(n), 'w') as outf:
for i in inits:
print(' '.join(ngram.generate_sentence(i)), file=outf)
def main():
"""
Trains and evaluates neural
language models on the Microsoft Sentence Completion
Challenge dataset.
Allowed cmd-line flags:
-s TS_FILES : Uses the reduced trainsed (TS_FILES trainset files)
-o MIN_OCCUR : Only uses terms that occur MIN_OCCUR or more times
in the trainset. Other terms are replaced with a special token.
-f MIN_FILES : Only uses terms that occur in MIN_FILES or more files
in the trainset. Other terms are replaced with a special token.
-n : n-gram length (default 4)
-t : Use tree-grams (default does not ues tree-grams)
-u FTRS : Features to use. FTRS must be a string composed of zeros
and ones, of length 5. Ones indicate usage of following features:
(word, lemma, google_pos, penn_pos, dependency_type), respectively.
Neural-net specific cmd-line flags:
-ep EPOCHS : Number of training epochs, defaults to 20.
-eps EPS : Learning rate, defaults to 0.005.
-mnb MBN_SIZE : Size of the minibatch, defaults to 2000.
"""
logging.basicConfig(level=logging.INFO)
log.info("Evaluating model")
# get the data handling parameters
ts_reduction = util.argv('-s', None, int)
min_occ = util.argv('-o', 5, int)
min_files = util.argv('-f', 2, int)
n = util.argv('-n', 4, int)
use_tree = '-t' in sys.argv
bool_format = lambda s: s.lower() in ["1", "true", "yes", "t", "y"]
ft_format = lambda s: map(bool_format, s)
ftr_use = np.array(util.argv('-u', ft_format("001000"), ft_format))
val_per_epoch = util.argv('-v', 10, int)
# nnets only support one-feature ngrams
assert ftr_use.sum() == 1
# get nnet training parameters
use_lbl = '-l' in sys.argv
epochs = util.argv('-ep', 20, int)
eps = util.argv('-eps', 0.002, float)
mnb_size = util.argv('-mnb', 2000, int)
n_hid = util.argv('-h', 1000, int)
d = util.argv('-d', 100, int)
# load data
ngrams, q_groups, answers, feature_sizes = data.load_ngrams(
n, ftr_use, use_tree, subset=ts_reduction,
min_occ=min_occ, min_files=min_files)
used_ftr_sizes = feature_sizes[ftr_use]
# remember, we only use one feature
vocab_size = used_ftr_sizes[0]
log.info("Data loaded, %d ngrams", ngrams.shape[0])
# split data into sets
x_train, x_valid, x_test = util.dataset_split(ngrams, 0.05, 0.05, rng=456)
# generate a version of the validation set that has
# the first term (the conditioned one) randomized
# w.r.t. unigram distribution
# so first create the unigram distribution, no smoothing
unigrams_data = data.load_ngrams(1, ftr_use, False, subset=ts_reduction,
min_occ=min_occ, min_files=min_files)[0]
unigrams_data = NgramModel(1, False, ftr_use, feature_sizes, ts_reduction,
min_occ, min_files, 0.0, 0.0, unigrams_data)
unigrams_dist = unigrams_data.probability_additive(
np.arange(vocab_size).reshape(vocab_size, 1))
unigrams_dist /= unigrams_dist.sum()
# finally, generate validation sets with randomized term
x_valid_r = random_ngrams(x_valid, vocab_size, False, unigrams_dist)
# the directory for this model
dir = "%s_%s_%d-gram_features-%s_data-subset_%r-min_occ_%r-min_files_%r"\
% ("llbl" if use_lbl else "lmlp",
"tree" if use_tree else "linear", n,
"".join([str(int(b)) for b in ftr_use]),
ts_reduction, min_occ, min_files)
dir = os.path.join(_DIR, dir)
if not os.path.exists(dir):
os.makedirs(dir)
# filename base for this model
file = "nhid-%d_d-%d_train_mnb-%d_epochs-%d_eps-%.5f" % (
n_hid, d, mnb_size, epochs, eps)
# store the logs
if False:
log_file_handler = logging.FileHandler(
os.path.join(dir, file + ".log"))
log_file_handler.setLevel(logging.INFO)
logging.root.addHandler(log_file_handler)
# we will plot log-lik ratios for every _VALIDATE_MNB minibatches
# we will also plot true mean log-lik
valid_on = {"x_valid": x_valid[:_LL_SIZE], "x_valid_r": x_valid_r[
:_LL_SIZE], "x_train": x_train[:_LL_SIZE]}
valid_ll = {k: [] for k in valid_on.keys()}
valid_p_mean = {k: [] for k in valid_on.keys()}
# how often we validate
mnb_count = (x_train.shape[0] - 1) / mnb_size + 1
_VALIDATE_MNB = mnb_count / val_per_epoch
def mnb_callback(net, epoch, mnb):
"""
Callback function called after every minibatch.
"""
if (mnb + 1) % _VALIDATE_MNB:
return
# calculate log likelihood using the exact probability
probability_f = theano.function([net.input], net.probability)
for name, valid_set in valid_on.iteritems():
p = probability_f(valid_set)
valid_ll[name].append(np.log(p).mean())
valid_p_mean[name].append(p.mean())
log.info('Epoch %d, mnb: %d, x_valid mean-log-lik: %.5f'
' , x_valid p-mean: %.5f'
' , ln(p(x_valid) / p(x_valid_r).mean(): %.5f',
epoch, mnb, valid_ll["x_valid"][-1],
valid_p_mean["x_valid"][-1],
valid_ll["x_valid"][-1] - valid_ll["x_valid_r"][-1])
# track if the model progresses on the sentence completion challenge
# sent_challenge = []
def epoch_callback(net, epoch):
# log some info about the parameters, just so we know
param_mean_std = [(k, v.mean(), v.std())
for k, v in net.params().iteritems()]
log.info("Epoch %d: %s", epoch, "".join(
["\n\t%s: %.5f +- %.5f" % pms for pms in param_mean_std]))
# evaluate model on the sentence completion challenge
# probability_f = theano.function([net.input], net.probability)
# qg_log_lik = [[np.log(probability_f(q)).sum() for q in q_g]
# for q_g in q_groups]
# predictions = map(lambda q_g: np.argmax(q_g), qg_log_lik)
# sent_challenge.append((np.array(predictions) == answers).mean())
# log.info('Epoch %d sentence completion eval score: %.4f',
# epoch, sent_challenge[-1])
log.info("Creating model")
if use_lbl:
net = LLBL(n, vocab_size, d, 12345)
else:
net = LMLP(n, vocab_size, d, 12345)
net.mnb_callback = mnb_callback
net.epoch_callback = epoch_callback
train_cost, valid_cost, _ = net.train(
x_train, x_valid, mnb_size, epochs, eps)
# plot training progress info
# first we need values for the x-axis (minibatch count)
mnb_count = (x_train.shape[0] - 1) / mnb_size + 1
mnb_valid_ep = mnb_count / _VALIDATE_MNB
x_axis_mnb = np.tile((np.arange(mnb_valid_ep) + 1) * _VALIDATE_MNB, epochs)
x_axis_mnb += np.repeat(np.arange(epochs) * mnb_count, mnb_valid_ep)
x_axis_mnb = np.hstack(([0], x_axis_mnb))
plt.figure(figsize=(16, 12))
plt.subplot(221)
plt.plot(mnb_count * (np.arange(epochs) + 1), train_cost, 'b-',
label='train')
plt.plot(mnb_count * (np.arange(epochs) + 1), valid_cost, 'g-',
label='valid')
plt.axhline(min(valid_cost), linestyle='--', color='g')
plt.yticks(list(plt.yticks()[0]) + [min(valid_cost)])
plt.title('cost')
plt.grid()
plt.legend(loc=1)
plt.subplot(222)
for name, valid_set in valid_ll.items():
plt.plot(x_axis_mnb, valid_set, label=name)
plt.ylim((np.log(0.5 / vocab_size),
max([max(v) for v in valid_ll.values()]) + 0.5))
plt.axhline(max(valid_ll["x_valid"]), linestyle='--', color='g')
plt.yticks(list(plt.yticks()[0]) + [max(valid_ll["x_valid"])])
plt.title('log-likelihood(x)')
plt.grid()
plt.legend(loc=4)
plt.subplot(224)
for name, valid_set in valid_p_mean.items():
plt.plot(x_axis_mnb, valid_set, label=name)
plt.title('p(x).mean()')
plt.grid()
plt.legend(loc=4)
# plt.subplot(224)
# plt.plot(mnb_count * np.arange(epochs + 1), sent_challenge, 'g-')
# plt.title('sent_challenge')
# plt.grid()
plt.savefig(os.path.join(dir, file + ".pdf"))
test_text.extend(sentences)
else:
test_text.append(txt)
#print test_files
print len(test_files)
total_train_files = []
TOTAL = INCREMENT
UPPER_LIMIT = 500
while len(total_train_files) < UPPER_LIMIT:
total_train_files = train_files[:TOTAL]
data_set_corpus = PlaintextCorpusReader(sys.argv[1], total_train_files)
estimator = lambda fdist, bins: LidstoneProbDist(fdist, 0.2)
lm = NgramModel(3, data_set_corpus.words(), estimator)
#lm = NgramModel(2, data_set_corpus.words(), estimator)
P = []
for s in test_text:
s_tokens = nltk.word_tokenize(s)
if SENTENCE:
#if len(s_tokens) > 3:
if len(s_tokens) > 10:
p = lm.perplexity(s_tokens)
P.append(p)
else:
p = lm.perplexity(s_tokens)
P.append(p)
TOTAL += INCREMENT
with open(file=path, mode="wb") as fp:
fp.write(pickle.dumps(obj=params_dict))
@classmethod
def load(cls, path):
"""
加载模型
:param path: 保存路径
:return:
"""
params_dict = pickle.load(open(file=path, mode="rb"))
lookup_table = params_dict['_lookup_table']
ngram_model = pickle.loads(params_dict['_ngram_model_pickle'],
fix_imports=True)
return cls(ngram_model=ngram_model, lookup_table=lookup_table)
if __name__ == '__main__':
from nltk.text import Text
from nltk.corpus import gutenberg
text1 = Text(gutenberg.words('melville-moby_dick.txt'))
#
ngramCounter = NgramCounter(order=2, train=text1)
ngramModel = NgramModel(ngram_counter=ngramCounter)
corrector = NgramCorrector(ngram_model=ngramModel)
print(corrector.correct(['I', 'dooo', 'think', 'you', 'rre', 'goooood']))
corrector2 = NgramCorrector.load("123")
print(corrector2.correct(['I', 'don', 'think', 'you', 'rre', 'goooood']))
class LVGNgramGenerator:
"""
Lemmatized vocabulary and grammar ngram-based generator
"""
def __init__(self, tuples, n):
"""
Parameters
----------
tuples : Iterable[(str, str, str)]
A list of (word, lemma, tag) tuples from which to learn a model
n : int
Maximum size of n-grams to use in NgramModel
"""
self._n = n
print("Creating models... (this may take some time)")
self._make_models(tuples)
print("Done!")
def _make_models(self, tuples):
self._word_ids = WordIdDictionary()
# Extract sequence of words, lemmas, and tags
words, lemmas, tags = tuple(
map(
lambda tokens: list(self._word_ids.add_words_transform(tokens)
), zip(*tuples)))
self._tags = tags
# Create models for words, lemmas, and tags
self._words_ngram = NgramModel(words, self._n)
self._lemmas_ngram = NgramModel(lemmas, self._n)
self._tags_ngram = NgramModel(
tags, 2 * self._n) # Can afford to use 2 * n-gram size for grammar
# Map tag and (tag, lemma) to valid lemmas and vocabulary, respectively
# It's faster to use a list than predicate on unigrams during backoff search
self._tag_lemmas = ConditionalFreqDist(zip(tags, lemmas))
self._tag_lemma_words = ConditionalFreqDist(
zip(zip(tags, lemmas), words))
def generate_without_pos(self, n):
"""
Generate n words without using any special POS information
"""
# Just use words NgramModel generate function
generated_words = self._words_ngram.generate(n)
return list(self._word_ids.transform_ids(generated_words))
def generate(self, n):
"""
Generate n words using copied grammar, generated lemmas, and words based on lemmas
"""
start = random.randint(n, len(self._tags) - n)
generated_tags = self._tags[
start:start + n] # Copy a random section of POS tags for grammar
# Generate sequence of lemmas based off of grammar
generated_lemmas = []
for tag in generated_tags:
# Search for and choose a lemma with correct tag
choice = self._lemmas_ngram.choose_word(
generated_lemmas,
backoff_limit=2,
predicate=lambda lemma: lemma in self._tag_lemmas[tag])
if choice is None:
# Could not find a good lemma for current POS tag, choose from list
choice = MLEProbDist(self._tag_lemmas[tag]).generate()
generated_lemmas.append(choice)
# Generate sequence of words based off of lemmas and grammar
generated_words = []
for (tag, lemma) in zip(generated_tags, generated_lemmas):
# Search for and choose word with correct lemma/tag
choices = self._words_ngram.backoff_search(
generated_words,
backoff_limit=2,
predicate=lambda word: word in self._tag_lemma_words[
(tag, lemma)])
if choices is None:
# Could not find a good word, choose from list
choices = self._tag_lemma_words[(tag, lemma)]
generated_words.append(MLEProbDist(choices).generate())
return list(self._word_ids.transform_ids(generated_words))
def generate_alternative(self, n):
"""
Generate n words using a more complicated algorithm
"""
generated_tags = []
generated_lemmas = []
generated_words = []
# Incrementally generate (tag, lemma) pairs
for i in range(n):
tag_choice = None # Start with nothing
# Loop through n-grams of grammar
size = 2 * self._n
while size > 2:
tag_choices = self._tags_ngram.backoff_search(
generated_tags,
backoff_limit=2,
predicate=lambda tag: True,
start_n=size)
# Determine valid lemmas in context with these tag choices
tag_to_lemma = {}
if tag_choices is not None:
for tag, _ in tag_choices.items():
# For each tag, find valid lemmas in context with that tag
lemma = self._lemmas_ngram.choose_word(
generated_lemmas,
backoff_limit=2,
predicate=lambda lemma: lemma in self._tag_lemmas[
tag])
if lemma is not None:
tag_to_lemma[tag] = lemma
if len(tag_to_lemma) > 1:
# We have found valid (tag, lemma) pairs
tag_probdist = MLEProbDist(
FreqDist({
tag: freq
for tag, freq in tag_choices.items()
if tag in tag_to_lemma
}))
tag_choice = tag_probdist.generate(
) # Randomly select the tag
lemma_choice = tag_to_lemma[
tag_choice] # Set the lemma
break
size -= 1 # Lower to smaller n-gram for more tag choices
if tag_choice is None:
# We still didn't find a valid (tag, lemma) pair, fallback
tag_choice = MLEProbDist(tag_choices).generate()
lemma_choice = MLEProbDist(
self._tag_lemmas[tag_choice]).generate()
generated_tags.append(tag_choice)
generated_lemmas.append(lemma_choice)
# Generate all words based on (tag, lemma) pairs
for (tag, lemma) in zip(generated_tags, generated_lemmas):
# Search for and choose word with correct lemma/tag
choices = self._words_ngram.backoff_search(
generated_words,
backoff_limit=2,
predicate=lambda word: word in self._tag_lemma_words[
(tag, lemma)])
if choices is None:
# Could not find a good word, choose from list
choices = self._tag_lemma_words[(tag, lemma)]
generated_words.append(MLEProbDist(choices).generate())
return list(self._word_ids.transform_ids(generated_words))
def train(train_file):
"""Return the required language models trained from a file."""
unigram = NgramModel(1)
bigram_left = NgramModel(2)
bigram_right = NgramModel(2)
for line in train_file:
tokens = line.rstrip().split()
unigram.update(tokens)
bigram_left.update(tokens)
bigram_right.update(reversed(tokens))
return (unigram, bigram_left, bigram_right)
class AGLearner:
"""A simple artificial language grammar learner."""
def __init__(self):
# Input counts
# Number of times each symbol is seen
self.counts = defaultdict(int)
# Number of times symbols co-occur
self.cooccurs = defaultdict(lambda: defaultdict(int))
# Whether a symbol is observed before or after another symbol
self.before = {sym: set() for sym in SYMBOLS}
self.after = {sym: set() for sym in SYMBOLS}
# Learning structures
self.requires = defaultdict(set)
self.excludes = defaultdict(set)
self.noprecede = defaultdict(set)
self.nofollow = defaultdict(set)
self.mustprecede = {sym: set(SYMBOLS) for sym in SYMBOLS}
self.mustfollow = {sym: set(SYMBOLS) for sym in SYMBOLS}
self.ngram = None
def train(self, train_path):
"""Train based on co-occurences in the provided data."""
term_symbols = []
# Process input
with open(train_path, "Ur") as train_file:
for line in train_file:
line_symbols = line.split()
# Learn co-occurences and precedes/follows
for idx, sym1 in enumerate(line_symbols):
# Count the symbol
self.counts[sym1] += 1
# Get the sets of the other items
preceding_symbols = set(line_symbols[:idx])
following_symbols = set(line_symbols[idx + 1:])
other_symbols = preceding_symbols | following_symbols
# Count cooccurences
for sym2 in other_symbols:
self.cooccurs[sym1][sym2] += 1
# Mark before/after
for sym2 in preceding_symbols:
self.before[sym1].add(sym2)
for sym2 in following_symbols:
self.after[sym1].add(sym2)
# Remove if one of the always relationships does
# not hold up
for sym2 in SYMBOLS:
if sym2 not in preceding_symbols:
try:
self.mustprecede[sym1].remove(sym2)
except KeyError:
pass
if sym2 not in following_symbols:
try:
self.mustfollow[sym1].remove(sym2)
except KeyError:
pass
# Add beginning and end terminators for n-grams
term_symbols.extend([START_SYM] + line_symbols + [END_SYM])
# Learn
# Requires/excludes and precedes/follows
for sym1 in SYMBOLS:
for sym2 in SYMBOLS:
# Co-occurence counts imply requires/excludes
count1 = self.counts[sym1]
if self.cooccurs[sym1][sym2] == count1:
self.requires[sym1].add(sym2)
elif self.cooccurs[sym1][sym2] == 0:
self.excludes[sym1].add(sym2)
# Figure out what cannot precede/follow
if sym2 not in self.before[sym1]:
self.noprecede[sym1].add(sym2)
if sym2 not in self.after[sym1]:
self.nofollow[sym1].add(sym2)
# N-gram model
self.ngram = NgramModel(2, term_symbols)
def report(self):
"""Report the rules learned."""
print "Co-occurence rules:"
for sym in SYMBOLS:
print sym, "requires", ', '.join(sorted(self.requires[sym]))
print sym, "excludes", ','.join(sorted(self.excludes[sym]))
print
print "Linear precedence rules:"
for sym in SYMBOLS:
print sym, "cannot be preceded by", ', '.join(sorted(self.noprecede[sym]))
print sym, "cannot be followed by", ', '.join(sorted(self.nofollow[sym]))
print
print "N-grams:"
for event, context, prob in self.ngram.allngrams():
print "{0} -> {1}: {2}".format(' '.join(context), event, prob)
def test(self, test_path, out_path):
"""Test on a file"""
test_file = open(test_path, "Ur")
out_file = open(out_path, "w")
header = ["Sentence", "Gold response", "Co-occur response", "Co-occur reason",
"Linear response", "Linear reason", "N-gram prob."]
print >> out_file, "\t".join(header)
for line in test_file:
sent, gold = line.strip().split(',')
gold = (gold.strip() == "True")
line_symbols = sent.split()
line_symbols_term = [START_SYM] + line_symbols + [END_SYM]
# Decode violations
cooccur_ok = True
cooccur_reasons = set()
linear_ok = True
linear_reasons = set()
for idx, sym1 in enumerate(line_symbols):
# Get the sets of the other items
preceding_symbols = set(line_symbols[:idx])
following_symbols = set(line_symbols[idx + 1:])
other_symbols = preceding_symbols | following_symbols
# Check requirements and exclusions for each pair
# Excluded symbols that are present
for sym2 in self.excludes[sym1] & other_symbols:
cooccur_ok = False
cooccur_reasons.add("{0} excludes {1}".format(sym1, sym2))
# Required symbols that are missing
for sym2 in self.requires[sym1] & (set(SYMBOLS) - other_symbols):
cooccur_ok = False
cooccur_reasons.add("{0} requires {1}".format(sym1, sym2))
# Check that preceding/following symbols are okay
for prec_sym in preceding_symbols:
if prec_sym in self.noprecede[sym1]:
linear_ok = False
linear_reasons.add("{1} cannot precede {0}".format(sym1, prec_sym))
for fol_sym in following_symbols:
if fol_sym in self.nofollow[sym1]:
linear_ok = False
linear_reasons.add("{1} cannot follow {0}".format(sym1, fol_sym))
# Check for missing preceding/following symbols
for prec_sym in self.mustprecede[sym1] - preceding_symbols:
linear_ok = False
linear_reasons.add("{1} must precede {0}".format(sym1, prec_sym))
for fol_sym in self.mustfollow[sym1] - following_symbols:
linear_ok = False
linear_reasons.add("{1} must follow {0}".format(sym1, fol_sym))
# N-gram statistics
prob = self.ngram.seqprob(line_symbols_term)
# Output
print >> out_file, "\t".join([" ".join(line_symbols), str(gold),
str(cooccur_ok), ", ".join(cooccur_reasons),
str(linear_ok), ", ".join(linear_reasons),
str(prob)])
# Clean up
test_file.close()
out_file.close()
