source = sys.argv[1]
else:
source = IMDB_DATA_DEFAULT
print "Loading data from original source"
imdb = ImdbDataHandler(source=source)
(train_reviews,
train_labels) = imdb.get_data(type=ImdbDataHandler.DATA_TRAIN,
shuffle=True)
(test_reviews, test_labels) = imdb.get_data(type=ImdbDataHandler.DATA_TEST,
shuffle=True)
# Simple bag of words with SGD
sgd = SGDTextClassifier(train_reviews,
train_labels,
test_texts=test_reviews,
test_labels=test_labels,
compute_features=True)
sgd.grid_search_cv(verbose=5, n_jobs=4)
test_error = sgd.get_test_error()
print "Test error in held out set: " + str(test_error)
print "=" * 20
# Now with bigrams too
sgd = SGDTextClassifier(train_reviews,
train_labels,
ngram_range=(1, 2),
test_texts=test_reviews,
test_labels=test_labels,
compute_features=True)
sgd.grid_search_cv(verbose=5, n_jobs=4)
print "Naive Bayes"
nb = NaiveBayesClassifier()
nb.set_training_data(train_reviews, train_labels)
nb.set_test_data(test_reviews, test_labels)
nb.set_bag_of_ngrams()
nb.train()
train_error = nb.get_training_error()
test_error = nb.get_test_error()
print "Training error: " + str(train_error)
print "Test error: " + str(test_error)
print "SGD Classifier"
sgd = SGDTextClassifier(train_reviews,
train_labels,
test_texts=test_reviews,
test_labels=test_labels)
#train_error = sgd.get_training_error()
#test_error = sgd.get_test_error()
#print "Training error: " + str(train_error)
#print "Test error: " + str(test_error)
sgd.set_bag_of_ngrams()
sgd.grid_search_cv(verbose=0, n_jobs=4)
print "Logistic classifier"
sgd = LogisticClassifier()
sgd.set_training_data(train_reviews, train_labels)
sgd.set_test_data(test_reviews, test_labels)
sgd.set_bag_of_ngrams()
sgd.train()
