def mutual_information_similarity(file_name):
"""
Calculates MI between all pairs of short_genre based on their word's MI.
Prints to file the similarity
:return:
"""
from sklearn.metrics.pairwise import cosine_similarity as cos_sim
import math
SimilarityScore = collections.namedtuple("SimilarityScore", ("g1", "g2", "score")) # a type
# fetch all short genres
mi_coll = MutualInformation()
# all possible pairs of genre with no repeat
genres = []
# calculate cosine similarity b/w pairs
dv = DictVectorizer()
def extract_bow_add_to_genres(genre, bow):
if genre not in genres:
genres.append(genre)
new_bow = {}
for k in bow.keys():
curr = bow[k]
new_bow[k] = 0 if math.isnan(curr) or math.isinf(curr) else curr
new_bow == 0 and print("Eliminated element")
return new_bow
bow_matrix = dv.fit_transform(
extract_bow_add_to_genres(mi_obj.short_genre, mi_obj.bow) for mi_obj in mi_coll.iterable()
)
print("Done with making vector")
# sort the pairs by the cosine similarity score
similarity_matrix = cos_sim(bow_matrix)
print("Done with similarity calculation")
sorted_list = []
# sort the similarity scores
for x, y in itertools.combinations(range(0, len(genres)), 2):
sorted_list.append(SimilarityScore(genres[x], genres[y], similarity_matrix[x][y]))
# sort!
sorted_list = sorted(sorted_list, key=operator.itemgetter(2), reverse=True)
print("printing file")
with open(file_name, mode="a", errors="ignore", encoding="latin-1") as file:
for l in sorted_list:
file.write("{}, {} value: {}\n".format(l[0], l[1], l[2]))
def transform_into_indicators(origin_dest_arr, params):
print "Fitting the label encoder"
keys= origin_dest_arr.keys()
origins = map(lambda x: {'origin': x}, origin_dest_arr['origin'].as_matrix().astype(str))
dests = map(lambda x: {'dest': x}, origin_dest_arr['dest'].as_matrix().astype(str))
d = DictVectorizer(sort=False)
reduce_fn = get_reduce_fn(keys)
print "mapping"
#cat = origin_dest_arr.to_dict(orient = 'records')
cat = map(lambda x: x.__self__, origin_dest_arr.apply(reduce_fn, axis = 1, raw = True, reduce = True))
print "Transforming"
return d.fit_transform(cat)
def cat_vectorize(train_data, test_data, num_cols):
# categorical attributes
cat_train_data = train_data.drop(num_cols, axis=1)
cat_test_data = test_data.drop(num_cols, axis=1)
cat_train_data.fillna('NA', inplace=True)
cat_test_data.fillna('NA', inplace=True)
cat_train_data_values = cat_train_data.T.to_dict().values()
cat_test_data_values = cat_test_data.T.to_dict().values()
# vectorize (encode as one hot)
vectorizer = DictVectorizer(sparse=False)
vec_train_data = vectorizer.fit_transform(cat_train_data_values)
vec_test_data = vectorizer.transform(cat_test_data_values)
return vec_train_data, vec_test_data
class EntityDetectionPU(ClassifierMixin):
def __init__(self, prior=.5, sigma=.1, lam=1, basis='gauss', n_basis=200):
self.clf = SparsePU_SL(prior=prior,
sigma=sigma,
lam=lam,
basis=basis,
n_basis=n_basis)
# self.clf = PU_SL(prior=prior, sigma=sigma, lam=lam, basis=basis, n_basis=n_basis)
# self.clf = SVC()
self.featureizer = DictVectorizer(sparse=True)
def fit(self, X, y):
x_feat = self.featureizer.fit_transform(X)
self.clf.fit(x_feat, y)
return self
def predict(self, X):
x_feat = self.featureizer.transform(X)
return self.clf.predict(x_feat)
def predict_sent(self, X_sent):
for xi in X_sent:
yield (self.predict([xi]))
def get_data_social(self, ids) :
'''
Read the social features from the database.
'''
# data = self.get_social_features(ids)
# First get some aggregated values
boards_info = self.get_boards_info()
repinned_info = self.get_repinned_info()
uncateg, categ_entropy = self.get_users_categories_features()
query = """SELECT p.id as pin_id,
u.id as user_id,
p.nComments as comments,
p.category as category,
p.description as description,
p.isRepin as is_repin,
p.date as date,
u.gender as gender,
u.nFollowers as followers,
u.nFollowing as following,
u.nPins as pins,
u.nBoards as boards,
(u.website != "null") as has_website,
p.board_id as board_id
FROM pins p JOIN users u ON p.user_id = u.id"""
# Make query, get results and represent as map {pin_id: data} for quick access
c = self.db.cursor()
c.execute(query)
rows_map = {row[0]: row[1:] for row in c.fetchall()}
c.close()
# Store concepts as a dict per row (pin)
data = []
for pin_id in ids:
(user_id, ncomments, categ, desc, is_repin, date, gender, nfollowers, nfollowing, npins, nboards, has_web, board_id) = rows_map[pin_id]
f = {}
# Convert to string to emphasize that this feature is categorical
# f["ncomments"] = ncomments
f["category"] = categ
f["description_len"] = len(desc)
f["is_repin"] = is_repin
f["gender"] = gender
# f["user_followers"] = nfollowers
f["user_following"] = nfollowing
f["users_pins"] = npins
f["users_boards"] = nboards
f["has_website"] = has_web
f["is_product"] = (1 if '$' in desc else 0)
f["day_of_the_week"] = (date.strftime("%a") if (date) else "")
if nfollowers == 0 :
nfollowers = 1
# f["follow_ratio"] = float(nfollowing)/nfollowers
board_pins, board_followers = boards_info[board_id]
f["board_pins"] = board_pins # Total pins of the board
# f["board_followers"] = board_followers # Total followers of the board
f["category_entropy"] = categ_entropy[user_id]
f["uncategorized"] = uncateg[user_id]
f["repinned"] = repinned_info[user_id]
data.append(f)
# data = data[0:4,:]
# Convert categorical features to numerical representation
vec = DictVectorizer()
data = vec.fit_transform(data).toarray()
return vec.get_feature_names(), data
class KMeansEstimator:
"""
This class reads the tweets of users from a file and builds cluster centers on that data. It also provides
method for finding the closest cluster center of unseen data.
"""
ADJECTIVE = 'JJ'
"""
Feature keys used in clustering...
"""
POLARITY_FEATURE_KEY = 'polarity'
SUBJECTIVITY_FEATURE_KEY = 'subjectivity'
TWEET_COUNT_FEATURE_KEY = 'tweetCount'
"""
Features not considered for clustering...
"""
USER_ID_FEATURE_KEY = 'userId'
LONGITUDE_FEATURE_KEY = 'longitude'
LATITUDE_FEATURE_KEY = 'latitude'
"""
Predicted label feature name.
"""
LABEL_FEATURE_KEY = 'label'
RELEVENT_FEATURE_LIST = [
USER_ID_FEATURE_KEY, LATITUDE_FEATURE_KEY, LONGITUDE_FEATURE_KEY,
LABEL_FEATURE_KEY
]
def __init__(self, tweet_file_path, no_of_clusters):
"""
The constructor reads csv file and builds the data matrix.
"""
self.np_extractor = ConllExtractor()
self.pos_tagger = NLTKTagger()
self.tweet_file_path = tweet_file_path
self.data_matrix = self.__get_data_matrix_from_file(tweet_file_path)
self.vectorizer = DictVectorizer(sparse=True)
self.k_means_estimator = KMeans(init="random",
n_clusters=no_of_clusters)
@time_it
def __get_data_matrix_from_file(self, tweet_file_path):
"""
Reads tweets from csv file at path "tweet_file_path", extracts features from the tweets and returns list
of all feature vectors.
"""
file_reader = csv.reader(open(tweet_file_path, "rb"), delimiter=',')
next(file_reader)
data_matrix = []
for row in file_reader:
logging.info("Extracting features for user_id:%s", row[0])
feature_vector = {}
feature_vector[self.USER_ID_FEATURE_KEY] = int(row[0])
feature_vector[self.LATITUDE_FEATURE_KEY] = float(row[2])
feature_vector[self.LONGITUDE_FEATURE_KEY] = float(row[3])
feature_vector[self.TWEET_COUNT_FEATURE_KEY] = int(row[4])
feature_vector.update(
self.__get_features_from_tweet_text(row[1].decode('utf-8')))
data_matrix.append(feature_vector)
logging.info("Successfully extracted features for user_id:%s",
row[0])
return data_matrix
@time_it
def __get_features_from_tweet_text(self, tweet_text):
"""This function returns the following features from the tweet text:
- Adjectives and their corresponding frequencies found in the tweet. Each adjective is a separate feature.
- Subjectivity and polarity as determined by TextBlob.
:returns: (key,value) map of all features found.
"""
text_blob = TextBlob(tweet_text,
np_extractor=self.np_extractor,
pos_tagger=self.pos_tagger)
adjective_map = dict(
Counter((ele[0] for ele in set(text_blob.pos_tags)
if ele[1] == self.ADJECTIVE)))
polarity = text_blob.sentiment[0]
subjectivity = text_blob.sentiment[1]
return dict(
adjective_map.items() + {
self.POLARITY_FEATURE_KEY: polarity,
self.SUBJECTIVITY_FEATURE_KEY: subjectivity
}.items())
@time_it
def __get_clustering_data_matrix(self, data_matrix):
"""
This method removes unnecessary features(features like user_id which are not relevant for building cluster centers) from
the data matrix and returns a copy of the data matrix.
"""
data_matrix_copy = copy.deepcopy(data_matrix)
for feature_vector in data_matrix_copy:
feature_vector.pop(self.USER_ID_FEATURE_KEY)
feature_vector.pop(self.LATITUDE_FEATURE_KEY)
feature_vector.pop(self.LONGITUDE_FEATURE_KEY)
return data_matrix_copy
@time_it
def perform_clustering(self, features_to_include=None):
"""
This function performs k-means clustering with "no_of_clusters" clusters of the data present in file at
"tweet_file_path".
It returns list of feature vector, where each feature vector contains only "features_to_include" or all features
if "features_to_include" is None.
"""
clustering_data_matrix = self.__get_clustering_data_matrix(
self.data_matrix)
transformed_data_matrix = self.vectorizer.fit_transform(
clustering_data_matrix)
self.k_means_estimator.fit(transformed_data_matrix, y=None)
return self.__get_predicted_labels(self.data_matrix,
features_to_include)
@time_it
def __get_predicted_labels(self, data_matrix, features_to_include):
"""
Finds the nearest cluster for all data points and adds a new feature label in all feature vectors of data matrix. The
data matrix is modified in place.
It returns a new copy of data_matrix with "features_to_include" features.
"""
feature_names = self.vectorizer.get_feature_names()
for feature_vector in data_matrix:
row = [0] * len(feature_names)
column = range(len(feature_names))
data = map(
lambda feature_name: feature_vector[feature_name]
if feature_name in feature_vector else 0, feature_names)
feature_csr_matrix = csr_matrix(coo_matrix((data, (row, column))))
predicted_label = self.k_means_estimator.predict(
feature_csr_matrix)
feature_vector[self.LABEL_FEATURE_KEY] = predicted_label[0]
expanded_data_matrix = self.__get_expanded_data_matrix(data_matrix)
if features_to_include:
return self.__get_filtered_data_matrix(expanded_data_matrix,
features_to_include)
else:
return expanded_data_matrix
@time_it
def __get_filtered_data_matrix(self, data_matrix, features_to_include):
"""
Removes all features except features_to_include
"""
filtered_data_matrix = []
for feature_vector in data_matrix:
filtered_feature_vector = {}
for feature_name in features_to_include:
filtered_feature_vector[feature_name] = feature_vector[
feature_name]
filtered_data_matrix.append(filtered_feature_vector)
return filtered_data_matrix
@time_it
def __get_expanded_data_matrix(self, data_matrix):
"""
Adds new keys for missing features to all feature vectors of data_matrix. The data matrix is not modified, but a new
modified copy is returned.
"""
feature_names = self.vectorizer.get_feature_names()
expanded_data_matrix = copy.deepcopy(data_matrix)
for feature_vector in expanded_data_matrix:
for feature_name in feature_names:
if feature_name not in feature_vector:
feature_vector[feature_name] = 0
return expanded_data_matrix
@time_it
def predict_labels_for_data(self, file_path, features_to_include=None):
"""
This function reads the tweets of different users from the file at file_path and assigns the closest
cluster center to each user.
It returns list of tuples of (user_id,predicted_label,latitude, longitude).
"""
data_matrix = self.__get_data_matrix_from_file(file_path)
return self.__get_predicted_labels(data_matrix, features_to_include)
def vectorize(data):
transformer = DictVectorizer()
values= flatten([make_features(x) for x in data])
X = transformer.fit_transform([x["x"] for x in values]).toarray()
Y = array([x["y"] for x in values])
return (X, Y, values)
class KMeansEstimator:
"""
This class reads the tweets of users from a file and builds cluster centers on that data. It also provides
method for finding the closest cluster center of unseen data.
"""
ADJECTIVE = 'JJ'
"""
Feature keys used in clustering...
"""
POLARITY_FEATURE_KEY = 'polarity'
SUBJECTIVITY_FEATURE_KEY = 'subjectivity'
TWEET_COUNT_FEATURE_KEY = 'tweetCount'
"""
Features not considered for clustering...
"""
USER_ID_FEATURE_KEY = 'userId'
LONGITUDE_FEATURE_KEY = 'longitude'
LATITUDE_FEATURE_KEY = 'latitude'
"""
Predicted label feature name.
"""
LABEL_FEATURE_KEY = 'label'
RELEVENT_FEATURE_LIST = [USER_ID_FEATURE_KEY, LATITUDE_FEATURE_KEY, LONGITUDE_FEATURE_KEY, LABEL_FEATURE_KEY]
def __init__(self, tweet_file_path, no_of_clusters):
"""
The constructor reads csv file and builds the data matrix.
"""
self.np_extractor = ConllExtractor()
self.pos_tagger = NLTKTagger()
self.tweet_file_path = tweet_file_path
self.data_matrix = self.__get_data_matrix_from_file(tweet_file_path)
self.vectorizer = DictVectorizer(sparse=True)
self.k_means_estimator = KMeans(init="random", n_clusters=no_of_clusters)
@time_it
def __get_data_matrix_from_file(self, tweet_file_path):
"""
Reads tweets from csv file at path "tweet_file_path", extracts features from the tweets and returns list
of all feature vectors.
"""
file_reader = csv.reader(open(tweet_file_path, "rb"), delimiter=',')
next(file_reader)
data_matrix = []
for row in file_reader:
logging.info("Extracting features for user_id:%s", row[0])
feature_vector = {}
feature_vector[self.USER_ID_FEATURE_KEY] = int(row[0])
feature_vector[self.LATITUDE_FEATURE_KEY] = float(row[2])
feature_vector[self.LONGITUDE_FEATURE_KEY] = float(row[3])
feature_vector[self.TWEET_COUNT_FEATURE_KEY] = int(row[4])
feature_vector.update(self.__get_features_from_tweet_text(row[1].decode('utf-8')))
data_matrix.append(feature_vector)
logging.info("Successfully extracted features for user_id:%s", row[0])
return data_matrix
@time_it
def __get_features_from_tweet_text(self, tweet_text):
"""This function returns the following features from the tweet text:
- Adjectives and their corresponding frequencies found in the tweet. Each adjective is a separate feature.
- Subjectivity and polarity as determined by TextBlob.
:returns: (key,value) map of all features found.
"""
text_blob = TextBlob(tweet_text, np_extractor=self.np_extractor, pos_tagger=self.pos_tagger);
adjective_map = dict(Counter((ele[0] for ele in set(text_blob.pos_tags) if ele[1] == self.ADJECTIVE)))
polarity = text_blob.sentiment[0]
subjectivity = text_blob.sentiment[1]
return dict(adjective_map.items() + {self.POLARITY_FEATURE_KEY:polarity, self.SUBJECTIVITY_FEATURE_KEY:subjectivity}.items())
@time_it
def __get_clustering_data_matrix(self, data_matrix):
"""
This method removes unnecessary features(features like user_id which are not relevant for building cluster centers) from
the data matrix and returns a copy of the data matrix.
"""
data_matrix_copy = copy.deepcopy(data_matrix)
for feature_vector in data_matrix_copy:
feature_vector.pop(self.USER_ID_FEATURE_KEY)
feature_vector.pop(self.LATITUDE_FEATURE_KEY)
feature_vector.pop(self.LONGITUDE_FEATURE_KEY)
return data_matrix_copy
@time_it
def perform_clustering(self, features_to_include=None):
"""
This function performs k-means clustering with "no_of_clusters" clusters of the data present in file at
"tweet_file_path".
It returns list of feature vector, where each feature vector contains only "features_to_include" or all features
if "features_to_include" is None.
"""
clustering_data_matrix = self.__get_clustering_data_matrix(self.data_matrix)
transformed_data_matrix = self.vectorizer.fit_transform(clustering_data_matrix)
self.k_means_estimator.fit(transformed_data_matrix, y=None)
return self.__get_predicted_labels(self.data_matrix, features_to_include)
@time_it
def __get_predicted_labels(self, data_matrix, features_to_include):
"""
Finds the nearest cluster for all data points and adds a new feature label in all feature vectors of data matrix. The
data matrix is modified in place.
It returns a new copy of data_matrix with "features_to_include" features.
"""
feature_names = self.vectorizer.get_feature_names()
for feature_vector in data_matrix:
row = [0] * len(feature_names)
column = range(len(feature_names))
data = map(lambda feature_name:feature_vector[feature_name] if feature_name in feature_vector else 0, feature_names)
feature_csr_matrix = csr_matrix(coo_matrix((data, (row, column))))
predicted_label = self.k_means_estimator.predict(feature_csr_matrix)
feature_vector[self.LABEL_FEATURE_KEY] = predicted_label[0]
expanded_data_matrix = self.__get_expanded_data_matrix(data_matrix)
if features_to_include:
return self.__get_filtered_data_matrix(expanded_data_matrix, features_to_include)
else:
return expanded_data_matrix
@time_it
def __get_filtered_data_matrix(self, data_matrix, features_to_include):
"""
Removes all features except features_to_include
"""
filtered_data_matrix = []
for feature_vector in data_matrix:
filtered_feature_vector = {}
for feature_name in features_to_include:
filtered_feature_vector[feature_name] = feature_vector[feature_name]
filtered_data_matrix.append(filtered_feature_vector)
return filtered_data_matrix
@time_it
def __get_expanded_data_matrix(self, data_matrix):
"""
Adds new keys for missing features to all feature vectors of data_matrix. The data matrix is not modified, but a new
modified copy is returned.
"""
feature_names = self.vectorizer.get_feature_names()
expanded_data_matrix = copy.deepcopy(data_matrix)
for feature_vector in expanded_data_matrix:
for feature_name in feature_names:
if feature_name not in feature_vector:
feature_vector[feature_name] = 0
return expanded_data_matrix
@time_it
def predict_labels_for_data(self, file_path, features_to_include=None):
"""
This function reads the tweets of different users from the file at file_path and assigns the closest
cluster center to each user.
It returns list of tuples of (user_id,predicted_label,latitude, longitude).
"""
data_matrix = self.__get_data_matrix_from_file(file_path)
return self.__get_predicted_labels(data_matrix, features_to_include)
# categorical attributes
cat_train = X_train.drop(numeric_cols, axis=1)
cat_test = X_test.drop(numeric_cols, axis=1)
cat_train.fillna('NA', inplace=True)
cat_test.fillna('NA', inplace=True)
x_cat_train = cat_train.T.to_dict().values()
x_cat_test = cat_test.T.to_dict().values()
# vectorize (encode as one hot)
vectorizer = DictVectorizer(sparse=False)
vec_x_cat_train = vectorizer.fit_transform(x_cat_train)
vec_x_cat_test = vectorizer.transform(x_cat_test)
# build the feature vector
x_train = np.hstack((x_num_train, vec_x_cat_train))
x_test = np.hstack((x_num_test, vec_x_cat_test))
#clfLR = LogisticRegression().fit(x_train, y_train.values)
#pred = clfLR.predict(x_test)
#print classification_report(y_test.values, pred, digits=4)
#print accuracy_score(y_test.values, pred)
clfTree = tree.DecisionTreeClassifier().fit(x_train, y_train)
predict = clfTree.predict(x_test)
class Model(object):
"""
Class for abstracting the different classification models.
"""
def __init__(self, train_tweets, train_targets, vect_options, tfidf_options, extra_params):
self.grid_params = {
# 'vect__ngram_range': [(1,1),(1,2),(2,2)],
# 'tfidf__use_idf': (True,False),
# 'tfidf__smooth_idf': (True, False),
# 'tfidf__sublinear_tf': (True, False),
}
self.grid_params = dict(self.grid_params.items()+extra_params.items())
self.vect_options = vect_options
self.tfidf_options = tfidf_options
self.feature_set = {}
self.train_tweets = train_tweets
self.train_targets = train_targets
self.only_text_features = False
def train_on_feature_set(self, cross_validate=True, use_tfidf=True):
"""
Performs training with the given model using the given feature set
"""
#Establish document text feature vectors
print "Vectorizing"
# self.tokenizer = CountVectorizer().build_tokenizer()
self.vect = CountVectorizer(**self.vect_options)
self.tfidf_transformer = TfidfTransformer(**self.tfidf_options)
self.dict_transformer = TfidfTransformer(**self.tfidf_options)
# train_counts_tf = tfidf_transformer.fit_transform(train_counts)
count_vector = self.vect.fit_transform([t.text for t in self.train_tweets])
tfidf_count = self.tfidf_transformer.fit_transform(count_vector)
if self.only_text_features:
combined_vector = tfidf_count
else:
self.dict_vectorizer = DictVectorizer()
dict_vector = self.dict_vectorizer.fit_transform(self.feature_set)
f=codecs.open("feature_set.txt", "w", "utf8")
for d in dict_vector:
f.write(d.__str__())
f.close()
tfidf_dict = self.dict_transformer.fit_transform(dict_vector)
f=codecs.open("feature_set_tdidf.txt", "w", "utf8")
for d in tfidf_dict:
f.write(d.__str__())
f.close()
combined_vector = sp.hstack([tfidf_count, tfidf_dict])
# combined_features = FeatureUnion()
#Crossvalidation
cross_validation = StratifiedKFold(self.train_targets, n_folds=10)
#Build a Pipeline with TFidfVectorizer and classifier
pipeline_classifier = Pipeline([
# ('vect', self.vect),
# ('tfidf', self.tfidf_transformer),
('clf', self.classifier)
])
#Perform grid search
print "Performing grid search with classifier of instance ",str(self.classifier.__class__.__name__)
self.grid = GridSearchCV(pipeline_classifier, self.grid_params, cv=cross_validation, refit=True, n_jobs=-1,verbose=1)
self.grid.fit(combined_vector, self.train_targets)
self.best_estimator = self.grid.best_estimator_
self.best_parameters = self.grid.best_params_
self.best_score = self.grid.best_score_
print "Results for ",self.classifier.__class__.__name__
print "Best params: ", self.best_parameters
print "Best score: ", self.best_score
print "Storing estimator... "
utils.store_model(self.classifier.__class__.__name__, self.best_parameters, self.best_score)
return self.grid
def grid_search_on_text_features(self, cross_validate=True, file_postfix=""):
"""
Performs a grid search using text features on the given dataset. Stores the parameters for the optimal classifier.
"""
self.grid_params = {
'vect__ngram_range': [(1,1),(1,2),(2,2),(1,3),(2,3),(3,3),(1,4)],
'vect__use_idf': (True,False),
'vect__smooth_idf': (True, False),
'vect__sublinear_tf': (True, False),
'vect__max_df': (0.5,),
}
self.vect = TfidfVectorizer()
cross_validation = StratifiedKFold(self.train_targets, n_folds=10)
#Build a Pipeline with TFidfVectorizer and classifier
pipeline_classifier = Pipeline([
('vect', self.vect),
('clf', self.classifier)]
)
#Perform grid search
print "Performing grid search with classifier of instance ",str(self.classifier.__class__.__name__)
self.grid = GridSearchCV(pipeline_classifier, self.grid_params, cv=cross_validation, refit=True, n_jobs=-1,verbose=1)
self.grid.fit([t.text for t in self.train_tweets], self.train_targets)
self.best_estimator = self.grid.best_estimator_
self.best_parameters = self.grid.best_params_
self.best_score = self.grid.best_score_
print "Results for ",self.classifier.__class__.__name__
print "Best params: ", self.best_parameters
print "Best score: ", self.best_score
print "Storing estimator... "
utils.store_model(self.classifier.__class__.__name__, self.best_parameters, self.best_score, file_postfix=file_postfix)
return self.grid
def classify(self, tweets, sentimentvalues=None):
"""
Performs the classification process on list of tweets.
"""
if sentimentvalues!=None:
self.test_words_and_values = sentimentvalues
count_vector = self.vect.transform([t.text for t in tweets])
tfidf_count = self.tfidf_transformer.transform(count_vector)
if self.only_text_features:
combined_vector = tfidf_count
else:
dict_vector = self.dict_vectorizer.transform([features.get_feature_set(t, self.featureset, v) for t,v in zip(tweets, self.test_words_and_values)])
tfidf_dict = self.dict_transformer.transform(dict_vector)
combined_vector = sp.hstack([tfidf_count, tfidf_dict])
predictions = self.best_estimator.predict(combined_vector)
return predictions
def classify_text(self, texts):
"""
Performs classification with only text features.
"""
count_vector = self.vect.transform([t for t in texts])
text_vector = self.tfidf_transformer.transform(count_vector)
predictions = self.best_estimator.predict(text_vector)
return predictions
def test_and_return_results(self, test_tweets, test_targets, sentimentvalues):
"""
Tests the classifier on a given test set, and returns the accuracy, precision, recall, and f1 score.
"""
self.test_words_and_values = sentimentvalues
predictions = self.classify(test_tweets)
binary_predictions = utils.reduce_targets(predictions)
binary_test_targets = utils.reduce_targets(test_targets)
accuracy = metrics.accuracy_score(binary_test_targets, binary_predictions)
precision = metrics.precision_score(binary_test_targets, binary_predictions)
recall = metrics.recall_score(binary_test_targets, binary_predictions)
f1_score = metrics.f1_score(binary_test_targets, binary_predictions)
print "Scores: ", accuracy, precision, recall, f1_score
return accuracy, precision, recall, f1_score
def get_correctly_classified_tweets(self, tweets_and_sentiment):
"""
Classifies the given set of tweets and returns the ones that were correctly classified.
"""
tweets, sentimentvalues = zip(*tweets_and_sentiment)
if sentimentvalues!=None:
self.test_words_and_values = sentimentvalues
count_vector = self.vect.transform([t.text for t in tweets])
tfidf_count = self.tfidf_transformer.transform(count_vector)
if self.only_text_features:
combined_vector = tfidf_count
else:
dict_vector = self.dict_vectorizer.transform([features.get_feature_set(t, self.featureset, v) for t,v in zip(tweets, self.test_words_and_values)])
tfidf_dict = self.dict_transformer.transform(dict_vector)
combined_vector = sp.hstack([tfidf_count, tfidf_dict])
predictions = self.best_estimator.predict(combined_vector)
tweets, targets = utils.make_subjectivity_targets(tweets)
#return the tweets where the target match prediction
correct_tweets = []
correct_sentimentvalues = []
for i in xrange(len(tweets)):
if predictions[i]==targets[i]:
correct_tweets.append(tweets[i])
correct_sentimentvalues.append(sentimentvalues[i])
return correct_tweets, correct_sentimentvalues
def set_feature_set(self, featureset, sentimentvalues):
"""
Extracts and stores the given feature set for classification.
"""
self.featureset = featureset
if featureset=='SA' or featureset=='PA':
self.only_text_features=True
self.feature_set = {}
else:
words_and_values = sentimentvalues
self.feature_set = [features.get_feature_set(t, self.featureset, v) for t,v in zip(self.train_tweets,words_and_values)]
def vectorize(data):
transformer = DictVectorizer()
values = flatten([make_features(x) for x in data])
X = transformer.fit_transform([x["x"] for x in values]).toarray()
Y = array([x["y"] for x in values])
return (X, Y, values)
if add_location:
id_features[id][id_location[id]] = '1'
id_features[id]['feature_count'] = float(id_feature_count[id])
id_features[id]['event_count'] = id_event_count[id]
id_features[id]['resource_count'] = id_resource_count[id]
train_ids = sorted(id_location_train.keys())
test_ids = sorted(id_location_test.keys())
train_features = [id_features[id] for id in train_ids]
test_features = [id_features[id] for id in test_ids]
labels = {'0': 0, '1': 1, '2': 2}
train_labels = [labels[id_severity_train[id]] for id in train_ids]
test_fake_labels = [train_labels[0]] * len(test_ids)
vectorizer = DictVectorizer()
X_train = vectorizer.fit_transform(train_features)
features = vectorizer.get_feature_names()
save_train_features = False
if save_train_features:
np.savetxt('x_train.txt',
X_train.toarray(),
delimiter=',',
header=','.join(features))
X_test = vectorizer.transform(test_features)
#scaler = prep.MinMaxScaler(feature_range=(0, 1), copy=True)
scaler = prep.StandardScaler(copy=True, with_mean=True, with_std=True)
X_train = scaler.fit_transform(X_train.toarray())
X_test = scaler.transform(X_test.toarray())
id_features[id][id_location[id]] = '1'
id_features[id]['feature_count'] = float(id_feature_count[id])
id_features[id]['event_count'] = id_event_count[id]
id_features[id]['resource_count'] = id_resource_count[id]
train_ids = sorted(id_location_train.keys())
test_ids = sorted(id_location_test.keys())
train_features = [id_features[id] for id in train_ids]
test_features = [id_features[id] for id in test_ids]
labels = {'0':0, '1':1, '2':2}
train_labels = [labels[id_severity_train[id]] for id in train_ids]
test_fake_labels = [train_labels[0]] * len(test_ids)
vectorizer = DictVectorizer()
X_train = vectorizer.fit_transform(train_features)
features = vectorizer.get_feature_names()
save_train_features = False
if save_train_features:
np.savetxt('x_train.txt', X_train.toarray(), delimiter=',', header=','.join(features))
X_test = vectorizer.transform(test_features)
#scaler = prep.MinMaxScaler(feature_range=(0, 1), copy=True)
scaler = prep.StandardScaler(copy=True, with_mean=True, with_std=True)
X_train = scaler.fit_transform(X_train.toarray())
X_test = scaler.transform(X_test.toarray())
do_feature_elimination = False
if do_feature_elimination:
estimator = RandomForestClassifier(n_estimators=2000, criterion='entropy', max_depth=None,
