def __init__(self, stopWords=True):
self.__wordCountByTermClass = collections.defaultdict(lambda: 0) # number of terms each each class has
self.__wordCountByClass = collections.defaultdict(lambda: 0) # sum ( number of terms each class has )
self.__numDocs = -1 # N
self.__classes = list() # class labels
self.__prior = collections.defaultdict(lambda: 0) # Nc / N
self.__N = collections.defaultdict(lambda: 0) # number of documents each class has
#self.__vocabulary = list()
self.__vocabulary = collections.defaultdict(lambda: 0) # Word -> frequency in all the training set
self.__totalNumberOfTokens = 0
self.__condProb = collections.defaultdict(lambda: 0) # CondProb[Class][Term]
self.__precision = collections.defaultdict(lambda: 0)
self.__recall = collections.defaultdict(lambda: 0)
self.__f1 = collections.defaultdict(lambda: 0)
self.__usingStopWordsList = stopWords
self.__stopWords = StopWords()
"""
cliente = base.iniciar_conexao()
con_colecao = base.iniciar_colecao(cliente, "colecao_processada")
def load_base():
all_textos = base.carrega_colecao_completo("brumadinhoinflux",
"colecao_completa")
return all_textos
# print('spaCy Version: %s' % (spacy.__version__))
spacy_nlp = spacy.load('pt')
nlp = spacy.load("pt_core_news_sm")
spacy_stopwords = spacy.lang.pt.stop_words.STOP_WORDS
set_stop = stopWords.load_stop_words()
# combina as duas bases de stopWords
set_stop.union(spacy_stopwords)
all_textos = load_base()
def to_int_str(data):
return str(int(data))
def remover_acentos(txt):
return normalize('NFKD', txt).encode('ASCII', 'ignore').decode('ASCII')
def common_words(tokens):
"""
import ast
import re
# import base
import string
from collections import Counter
from unicodedata import normalize
import emoji
import spacy
import stopWords.StopWords as stopWords
# print('spaCy Version: %s' % (spacy.__version__))
nlp = spacy.load("pt_core_news_sm")
spacy_stopwords = spacy.lang.pt.stop_words.STOP_WORDS
set_stop = stopWords.load_stop_words()
# carrega adjetivos
set_adjetivos = stopWords.load_stop_words("adjetivos.txt")
# combina as duas bases de stopWords
set_stop = set_stop.union(spacy_stopwords)
set_stop = set_stop.union(set_adjetivos)
def remove_emoji(text):
"""remove emoji de uma string."""
return emoji.get_emoji_regexp().sub(u'', text)
def to_int_str(data):
"""converte para inteiro."""
return str(int(data))
import math
import heapq
import subprocess
from stopWords import StopWords
from Stemmer import Stemmer
reload(sys)
sys.setdefaultencoding('utf8')
argv = sys.argv
PATH_WIKI_XML = './'
FILENAME_WIKI = './wiki-search-small.xml'
ENCODING = "utf-8"
stop_words = StopWords()
stop_words.readStopWords()
stemmer = Stemmer('english')
freq = {}
doc_freq = {}
titles = {}
category_detection = re.compile(u"\[\[Category:(.*?)\]\]", re.M)
file_cntr = 0
file_step = 1000
def getCategories(text):
cate = []
matches = re.finditer(category_detection, text)
if matches:
for match in matches:
temp = match.group(1).split("|")
class NB:
def __init__(self, stopWords=True):
self.__wordCountByTermClass = collections.defaultdict(lambda: 0) # number of terms each each class has
self.__wordCountByClass = collections.defaultdict(lambda: 0) # sum ( number of terms each class has )
self.__numDocs = -1 # N
self.__classes = list() # class labels
self.__prior = collections.defaultdict(lambda: 0) # Nc / N
self.__N = collections.defaultdict(lambda: 0) # number of documents each class has
#self.__vocabulary = list()
self.__vocabulary = collections.defaultdict(lambda: 0) # Word -> frequency in all the training set
self.__totalNumberOfTokens = 0
self.__condProb = collections.defaultdict(lambda: 0) # CondProb[Class][Term]
self.__precision = collections.defaultdict(lambda: 0)
self.__recall = collections.defaultdict(lambda: 0)
self.__f1 = collections.defaultdict(lambda: 0)
self.__usingStopWordsList = stopWords
self.__stopWords = StopWords()
def __getAllStatistics(self, data):
logging.info("Calculating statistics...")
for featureVector in data:
className = featureVector.pop(0) # remove temporarily
categoryName = featureVector.pop(1) # remove temporarrily
if len(featureVector) == 0: # Empty category found...
logging.warning("No pages were found for category %s", categoryName)
continue
#Add new class to set of classes, if necessary
if className not in self.__classes:
self.__classes.append(className)
self.__wordCountByTermClass[className] = collections.defaultdict(lambda: 0)
#increment number of documents of this class
self.__N[className] += 1
for (value, freq) in featureVector.iteritems():
if self.__usingStopWordsList and self.__stopWords.isStopWord(value):
continue
freq = int(freq)
self.__wordCountByTermClass[className][value] += freq
self.__wordCountByClass[className] += freq
#if value not in self.__vocabulary:
# self.__vocabulary.append(value)
self.__vocabulary[value] += freq
self.__totalNumberOfTokens += freq
featureVector[0] = className
featureVector[1] = categoryName
#remove empty elements
data = [elem for elem in data if len(elem) > 0]
#Get the size of valid documents found
self.__numDocs = len(data)
if self.__numDocs == 0:
logging.error("Empty training set! Aborting...")
print "ERROR - empty training set!"
sys.exit(0)
def trainClassifier(self, data):
logging.info("Training NB...")
self.__getAllStatistics(data)
logging.info("Calculated statistics. Using %d categories.", self.__numDocs)
for c in self.__classes:
self.__prior[c] = self.__N[c] / self.__numDocs
self.__condProb[c] = collections.defaultdict(lambda: (1 / (self.__wordCountByClass[c] + len(self.__vocabulary))))
logging.debug("Class %s - Prior %f", c, self.__prior[c])
for v in self.__vocabulary.keys():
self.__condProb[c][v] = (self.__wordCountByTermClass[c][v] + 1) / (self.__wordCountByClass[c] + len(self.__vocabulary))
logging.debug("Class %s - Word %s Conditional Probability --> %f", c, v, self.__condProb[c][v])
# logging.info("Most commom words:")
# for (w,k) in sorted(self.__vocabulary.iteritems(), key=operator.itemgetter(1), reverse=True):
# if k / self.__totalNumberOfTokens > 0.005:
# logging.info("(more than 1 of all tokens --- Item %s - frequency %d - %f of tokens", w, k, k/self.__totalNumberOfTokens)
# sys.exit(0)
def testInBatch(self, instances):
logging.info("Testing in Batch mode...")
correctMap = collections.defaultdict(lambda: 0)
numberOfIntances = collections.defaultdict(lambda: 0)
predictedMap = collections.defaultdict(lambda: 0)
for instance in instances:
groundTruth = instance[0]
categoryName = instance[1]
predicted = self.testClassifier(instance)
numberOfIntances[groundTruth] += 1
predictedMap[predicted] += 1
if predicted == groundTruth:
correctMap[groundTruth] += 1
logging.info("Result details by class...")
for c in self.__classes:
print "------- For Class", c,
logging.info("----- For class %s", c)
try:
self.__precision[c] = correctMap[c] / predictedMap[c]
except ZeroDivisionError:
self.__precision[c] = 0.0
logging.warn("PredictedMap[%s] = 0.0. This class was never predicted!", c)
print "precision =", self.__precision[c],
logging.info("-- Precision %f", self.__precision[c])
try:
self.__recall[c] = correctMap[c] / numberOfIntances[c]
except ZeroDivisionError:
self.__recall[c] = 0.0
logging.warn("Recall[%s] = 0.0 --- numberOfInstances of this class is zero!", c)
print "recall =", self.__recall[c]
logging.info("-- Recall %f", self.__recall[c])
try:
self.__f1[c] = (2 * self.__precision[c] * self.__recall[c]) / (self.__precision[c] + self.__recall[c])
except ZeroDivisionError:
self.__f1[c] = 0.0
logging.warn("F1[%s] = 0.0 --- precision + recall = 0!", c)
print "F1 =", self.__f1[c]
logging.info("-- F1 %f", self.__f1[c])
def testClassifier(self, instance):
score = collections.defaultdict(lambda: 0)
classInformation = instance.pop(0) # remove class information temporarily
categoryName = instance.pop(1) # remove category name temporarily
#logging.debug("Category %s", categoryName)
#logging.debug(instance)
for c in self.__classes:
score[c] = math.log(self.__prior[c])
for (word, freq) in instance.iteritems():
if self.__usingStopWordsList and self.__stopWords.isStopWord(word):
continue
score[c] += (int(freq) * math.log(self.__condProb[c][word]))
logging.debug("Predicted score for class %s => %f", c, score[c])
instance[0] = classInformation
instance[1] = categoryName
predicted = max(score, key=score.get)
logging.info("Tested instance \'%s\' --- Class predicted %s --- ground truth %s", categoryName, predicted, classInformation)
return predicted
