def load_data(config={}):
"""
Load the Reuters dataset.
Returns
-------
data : dict
with keys 'x_train', 'x_test', 'y_train', 'y_test', 'labels'
"""
stop_words = stopwords.words("english")
vectorizer = TfidfVectorizer(stop_words=stop_words)
mlb = MultiLabelBinarizer()
documents = reuters.fileids()
test = [d for d in documents if d.startswith('test/')]
train = [d for d in documents if d.startswith('training/')]
docs = {}
docs['train'] = [reuters.raw(doc_id) for doc_id in train]
docs['test'] = [reuters.raw(doc_id) for doc_id in test]
xs = {'train': [], 'test': []}
xs['train'] = vectorizer.fit_transform(docs['train']).toarray()
xs['test'] = vectorizer.transform(docs['test']).toarray()
ys = {'train': [], 'test': []}
ys['train'] = mlb.fit_transform([reuters.categories(doc_id)
for doc_id in train])
ys['test'] = mlb.transform([reuters.categories(doc_id)
for doc_id in test])
data = {'x_train': xs['train'], 'y_train': ys['train'],
'x_test': xs['test'], 'y_test': ys['test'],
'labels': globals()["labels"]}
return data
def load_data():
"""
Load the Reuters dataset.
Returns
-------
train_docs, train_labels, test_docs, test_labels.
"""
documents = reuters.fileids()
train = [d for d in documents if d.startswith('training/')]
train_docs = [reuters.raw(doc_id) for doc_id in train]
train_docs = [text_prepare(x) for x in train_docs]
train_labels = [reuters.categories(doc_id) for doc_id in train]
test = [d for d in documents if d.startswith('test/')]
test_docs = [reuters.raw(doc_id) for doc_id in test]
test_docs = [text_prepare(x) for x in test_docs]
test_labels = [reuters.categories(doc_id) for doc_id in test]
print("len(train_docs)={}, len(train_labels)={}".format(
len(train_docs), len(train_labels)))
print("len(test_docs)={}, len(test_labels)={}".format(
len(test_docs), len(test_labels)))
mlb = MultiLabelBinarizer(classes=sorted(labels))
train_labels = mlb.fit_transform(train_labels)
test_labels = mlb.fit_transform(test_labels)
print("y_train.shape={}, y_test.shape={}".format(train_labels.shape,
test_labels.shape))
return (train_docs, train_labels, test_docs, test_labels, mlb.classes)
def getDocIDs_top10():
# Top 10 Categories
documents = [
f for f in reuters.fileids() if len(reuters.categories(fileids=f)) == 1
]
train_docs_id = list(
filter(
lambda doc: doc.startswith("train") and len(reuters.raw(doc)) > 51,
documents))
test_docs_id = list(
filter(
lambda doc: doc.startswith("test") and len(reuters.raw(doc)) > 51,
documents))
new_train_docs_id = []
new_test_docs_id = []
for cat in reuters.categories():
li = [f for f in reuters.fileids(categories=cat) if f in train_docs_id]
li_te = [
f for f in reuters.fileids(categories=cat) if f in test_docs_id
]
if len(li) > 20 and len(li_te) > 20:
new_train_docs_id.extend(li)
new_test_docs_id.extend(li_te)
train_docs_id = new_train_docs_id
test_docs_id = new_test_docs_id
return (train_docs_id, test_docs_id)
def load_data(config={}):
"""
Load the Reuters dataset.
Returns
-------
data : dict
with keys 'x_train', 'x_test', 'y_train', 'y_test', 'labels'
"""
stop_words = stopwords.words("english")
vectorizer = TfidfVectorizer(stop_words=stop_words)
mlb = MultiLabelBinarizer()
documents = reuters.fileids()
test = [d for d in documents if d.startswith('test/')]
train = [d for d in documents if d.startswith('training/')]
docs = {}
docs['train'] = [reuters.raw(doc_id) for doc_id in train]
docs['test'] = [reuters.raw(doc_id) for doc_id in test]
xs = {'train': [], 'test': []}
xs['train'] = vectorizer.fit_transform(docs['train']).toarray()
xs['test'] = vectorizer.transform(docs['test']).toarray()
ys = {'train': [], 'test': []}
ys['train'] = mlb.fit_transform(
[reuters.categories(doc_id) for doc_id in train])
ys['test'] = mlb.transform([reuters.categories(doc_id) for doc_id in test])
data = {
'x_train': xs['train'],
'y_train': ys['train'],
'x_test': xs['test'],
'y_test': ys['test'],
'labels': globals()["labels"]
}
return data
def __init__(self, corpusData):
# getting all the document ids in corpusData, such as reuters
docs = corpusData.fileids()
# splitting into training and test docs ids
self.train_docs_ids = list(
filter(lambda doc: doc.startswith("train"), docs))
self.test_docs_ids = list(
filter(lambda doc: doc.startswith("test"), docs))
# getting the actual data from those ids
self.train_docs = [
corpusData.raw(doc_id) for doc_id in self.train_docs_ids
]
self.test_docs = [
corpusData.raw(doc_id) for doc_id in self.test_docs_ids
]
self.docs = self.train_docs + self.test_docs
# transforming multilabels
mlb = MultiLabelBinarizer()
self.train_labels = mlb.fit_transform(
[reuters.categories(doc_id) for doc_id in self.train_docs_ids])
self.test_labels = mlb.transform(
[reuters.categories(doc_id) for doc_id in self.test_docs_ids])
#vectorizers
self.count_vectorizer = CountVectorizer(analyzer='word',
stop_words='english')
self.tfidf_vectorizer = TfidfVectorizer(analyzer='word',
stop_words='english',
token_pattern='[A-Za-z]{3,}')
def load_data(config={}):
stop_words = stopwords.words("english")
vectorizer = TfidfVectorizer(stop_words=stop_words, binary=True)
mlb = MultiLabelBinarizer()
documents = reuters.fileids()
test = [d for d in documents if d.startswith('test/')]
train = [d for d in documents if d.startswith('training/')]
docs = {}
docs['train'] = [reuters.raw(doc_id) for doc_id in train]
docs['test'] = [reuters.raw(doc_id) for doc_id in test]
xs = {'train': [], 'test': []}
xs['train'] = vectorizer.fit_transform(docs['train']).toarray()
xs['test'] = vectorizer.transform(docs['test']).toarray()
ys = {'train': [], 'test': []}
ys['train'] = mlb.fit_transform(
[reuters.categories(doc_id) for doc_id in train])
ys['test'] = mlb.transform([reuters.categories(doc_id) for doc_id in test])
data = {
'x_train': xs['train'],
'y_train': ys['train'],
'x_test': xs['test'],
'y_test': ys['test'],
'labels': reuters.categories()
}
print(data['x_train'])
print(data['y_train'])
return data, vectorizer.vocabulary_
def categorize_kNNSimScoring(testDocs,
trainDocs,
docId,
neighbors,
fr=0.75):
"""
Uses a similarity scoring approach for categorizing the test docs. With the nearest neighbors,
for each class we assign a score based on which neighboring nodes have that class and assign weightings based
on the cosine similarity.
"""
#input is a test doc (assume nonempty or else the fr part in line 446 (second to last) will cause issues)
#O(n^3)
categories = reuters.categories(neighbors)
catgScores = []
for c in categories:
score = 0.0
for n in neighbors:
if c in reuters.categories(n):
score += classifierTraining.dot(testDocs[docId],
trainDocs[n].doc_vec)
catgScores.append((score, c))
catgScores = heapq.nlargest(
int(round(len(categories) * fr)),
catgScores) #should check if round function is O(1) or O(n)
return [c for s, c in catgScores]
def get_raw_data():
nltk.download("reuters")
from nltk.corpus import reuters
documents = reuters.fileids()
train_docs_id = list(filter(lambda doc: doc.startswith("train"),
documents))
test_docs_id = list(filter(lambda doc: doc.startswith("test"),
documents))
X_train = [(reuters.raw(doc_id)) for doc_id in train_docs_id]
X_test = [(reuters.raw(doc_id)) for doc_id in test_docs_id]
mlb = MultiLabelBinarizer()
y_train = [reuters.categories(doc_id)
for doc_id in train_docs_id]
y_test = [reuters.categories(doc_id)
for doc_id in test_docs_id]
all_dataa = X_train + X_test
all_lavelsa = y_train + y_test
mlb = MultiLabelBinarizer()
datas_y = mlb.fit_transform(all_lavelsa)
return all_dataa,all_lavelsa
def __init__(self):
self.documents = []
self.categories = reuters.categories()
self.tfidf = tf_idf()
#iteracja po wszystkich dokumentach reuters
for docid in reuters.fileids():
#odrzucenie dokumentów, które mają więcej niż 1 kategorię
if len(reuters.categories(docid)) > 1:
continue
#określenie kategorii dokumentu
cat = 0
for i in range(90):
if self.categories[i] in reuters.categories(docid):
cat = i
#określenie czy dokument jest przeznaczony do treningów czy do testów
if docid.startswith("train"):
train = 1
elif docid.startswith("test"):
train = 0
else:
raise ()
text = reuters.raw(docid)
doc = document(text, cat, train)
#dodanie dokumentu do klasy TfIdf - potrzebne do późniejszych obliczeń
self.tfidf.add_document(doc)
#dodanie dokumentu do tablicy dokumentów
self.add_document(doc)
self.initialize_vocabulary()
def reuters_dataset():
nltk.download('reuters')
nltk.download('stopwords')
stop_words = stopwords.words("english")
documents = reuters.fileids()
train_docs_id = [doc for doc in documents if doc.startswith("train")]
test_docs_id = [doc for doc in documents if doc.startswith("test")]
train_docs = [reuters.raw(doc_id) for doc_id in train_docs_id]
test_docs = [reuters.raw(doc_id) for doc_id in test_docs_id]
print(len(train_docs), len(test_docs))
vectorizer = TfidfVectorizer(stop_words=stop_words)
vectorised_train_documents = vectorizer.fit_transform(train_docs)
vectorised_test_documents = vectorizer.transform(test_docs)
# print([reuters.categories(doc_id) for doc_id in test_docs_id])
mlb = MultiLabelBinarizer()
train_labels = mlb.fit_transform(
[reuters.categories(doc_id) for doc_id in train_docs_id])
test_labels = mlb.transform(
[reuters.categories(doc_id) for doc_id in test_docs_id])
return vectorised_train_documents.toarray(
), vectorised_test_documents.toarray(), train_labels, test_labels
def reuters_to_df(set_name, label_to_idx):
data = [x for x in reuters.fileids() if set_name in x]
# collect all data to create df from
all_texts = [
" ".join([" ".join(sen) for sen in reuters.sents(doc_id)])
for doc_id in data
]
all_labels = np.zeros((len(all_texts), len(label_to_idx)))
all_label_indices = [[
label_to_idx[lab] for lab in reuters.categories(doc_id)
] for doc_id in data]
for i, labs in enumerate(all_label_indices):
# binary encode the labels
all_labels[i][labs] = 1
all_labels = all_labels.astype(int)
# all_labels[all_label_indices] = 1
cols = ["text"]
label_cols = ["topic_{}".format(lab) for lab in reuters.categories()]
cols.extend(label_cols)
# create df and set values
df = pd.DataFrame(columns=cols)
df["text"] = all_texts
df[label_cols] = all_labels
return df
def get_data_splits():
train_docs, train_labels = zip(*[(reuters.raw(i), reuters.categories(i))
for i in reuters.fileids()
if i.startswith('training/')])
test_docs, test_labels = zip(*[(reuters.raw(i), reuters.categories(i))
for i in reuters.fileids()
if i.startswith('test/')])
return train_docs, train_labels, test_docs, test_labels
def print_reuters():
from nltk.corpus import reuters
# print reuters.fileids()
# print reuters.categories()
print reuters.categories('training/9865')
print reuters.categories(['training/9865','training/9880'])
print reuters.fileids('barley')
print reuters.fileids(['barely','corn'])
def __init__(self):
# print reuters categories
print "reuters categories"
print reuters.categories()
# TODO this is probably bad
print "getting nodes"
self.nodes = database.get_all_nodes()
print "training classifier"
self.classifier = DocumentClassifier()
def explore_categories(max_len=5000, min_len=100, percentage=0.3):
for cat in reuters.categories():
for cat2 in reuters.categories():
if cat2 > cat:
if len(set(reuters.fileids(cat)) & set(reuters.fileids(cat2))) == 0:
l1 = len(reuters.fileids(cat))
l2 = len(reuters.fileids(cat2))
if ( (l1 + l2) > min_len) and ( (l1 + l2) < max_len) and float((min(l1, l2))/float(l1+l2) > percentage):
print cat, cat2, l1 + l2, float(min(l1, l2))/float(l1+l2)
def __init__(self, min_eic=5):
self.test_classes = []
self.test_docs = []
self.train_classes = []
self.train_docs = []
self.table_of_classes = []
self.num_of_instances = []
# mininimal encounter in classes
self.min_eic = min_eic
if Path("training_cache/train_docs").is_file() and Path("training_cache/train_classes").is_file() \
and Path("training_cache/test_docs").is_file() and Path("training_cache/test_classes").is_file() \
and Path("classify_cache/table_of_classes").is_file():
self.train_docs = joblib.load("training_cache/train_docs")
self.train_classes = joblib.load("training_cache/train_classes")
self.test_docs = joblib.load("training_cache/test_docs")
self.test_classes = joblib.load("training_cache/test_classes")
self.table_of_classes = joblib.load(
"classify_cache/table_of_classes")
else:
raw_test_classes = []
raw_train_classes = []
for doc_id in reuters.fileids():
if doc_id.startswith("train"):
self.train_docs.append(
prepare_text_for_analysis(reuters.raw(doc_id)))
raw_train_classes.append(reuters.categories(doc_id))
else:
self.test_docs.append(
prepare_text_for_analysis(reuters.raw(doc_id)))
raw_test_classes.append(reuters.categories(doc_id))
self.make_table_of_classes(raw_train_classes)
self.train_classes = self.transform_classes(
raw_train_classes, "train")
self.test_classes = self.transform_classes(raw_test_classes,
"test")
joblib.dump(self.train_docs,
"training_cache/train_docs",
compress=9)
joblib.dump(self.train_classes,
"training_cache/train_classes",
compress=9)
joblib.dump(self.test_docs, "training_cache/test_docs", compress=9)
joblib.dump(self.test_classes,
"training_cache/test_classes",
compress=9)
joblib.dump(self.table_of_classes,
"classify_cache/table_of_classes",
compress=9)
def main():
collection_stats()
print("Staring classifier ..")
X_train = list()
X_test = list()
y_train = list()
y_test = list()
print("Reading training and testing data ..")
for doc_id in reuters.fileids():
if doc_id.startswith("train"):
X_train.append(reuters.raw(doc_id))
y_train.append(reuters.categories(doc_id))
else:
X_test.append(reuters.raw(doc_id))
y_test.append(reuters.categories(doc_id))
X_train = numpy.array(X_train)
y_train = numpy.array(y_train)
X_test = numpy.array(X_test)
y_test = numpy.array(y_test)
binarizer = MultiLabelBinarizer(classes=reuters.categories())
classifier = Pipeline([
('vectorizer',
TfidfVectorizer(tokenizer=tokenize,
min_df=0,
max_df=0.90,
max_features=3000,
use_idf=True,
sublinear_tf=True)),
# ('tfidf', TfidfTransformer()),
('clf', OneVsRestClassifier(LogisticRegression()))
])
print("Training classifier ..")
classifier.fit(X_train, binarizer.fit_transform(y_train))
print("Testing classifier ..")
res = classifier.predict(X_test)
hard_precision = classifier.score(X_test, binarizer.transform(y_test))
precision = average_precision_score(res,
binarizer.fit_transform(y_test),
average=None)
recall = recall_score(res, binarizer.fit_transform(y_test), average=None)
f1score = f1_score(res, binarizer.fit_transform(y_test), average=None)
print("Hard precision: " + str(hard_precision))
log_results(reuters.categories(), precision, recall, f1score)
def get_test_set():
single_categories = [(id, re.categories(id)[0])
for id in re.fileids()
if len(re.categories(id)) == 1]
single_cat_list = distribution(single_categories, itemgetter(1))
used_categories = [x[0]
for x in single_cat_list
if x[1] < 600 and x[1] > 200]
return [pair for pair in single_categories if pair[1] in used_categories]
def get_target(self):
# cat1 vs. cat2
if len(self.categories) > 1:
target = [ [cat for cat in reuters.categories(fileid) if cat in self.categories][0]
for fileid in self.fileids]
# cat1 vs. not cat1
else:
target = [ 1 if self.categories[0] in reuters.categories(fileid) else 0
for fileid in self.fileids]
self.classes, target = np.unique(target, return_inverse=True)
return target
def labels(filenames, cats=None):
"""Return topic labels (one-hot format) for given files
:param filenames: selected files from Reuters dataset
:param cats: categories to filter (optional)
:return: topic labels (one-hot format)
"""
if cats is None: cats = reuters.categories()
data = [[c for c in reuters.categories(f) if c in cats] for f in filenames]
mb = MultiLabelBinarizer(classes = cats)
onehot = mb.fit_transform(data)
df = pd.DataFrame(onehot, columns=cats)
return df
def get_default_split():
documents = reuters.fileids()
train_docs_id = list(
filter(lambda doc: doc.startswith("train"), documents))
test_docs_id = list(
filter(lambda doc: doc.startswith("test"), documents))
X_train = [reuters.raw(doc_id) for doc_id in train_docs_id]
X_test = [reuters.raw(doc_id) for doc_id in test_docs_id]
Y_train = [reuters.categories(doc_id) for doc_id in train_docs_id]
Y_test = [reuters.categories(doc_id) for doc_id in test_docs_id]
return X_train, Y_train, X_test, Y_test
def get_labels():
most_common_class = collections.Counter(
[c for cs in [reuters.categories(fileid) for fileid in fileids] \
for c in cs]).most_common(1)[0][0]
print('Most common class in sampled documents:',
most_common_class)
return (
np.array(
[1 if most_common_class in reuters.categories(
fileid) else 0 for fileid in fileids],
dtype=np.int32),
('other', most_common_class)
)
def get_topics(min_samples=None):
"""Return set of topics from Reuters corpus
If *min_samples* is specified, only topics with at
least that many examples are included.
:param min_samples: minimum number of example per topic
:return: list of topics
"""
cats = reuters.categories()
if min_samples is not None:
cats = [c for c in reuters.categories() if len(reuters.fileids(c)) >= min_samples]
return cats
def build_output(dataset='train'):
documents = reuters.fileids()
docs_id = list(filter(lambda doc: doc.startswith(dataset), documents))
output = np.zeros((len(docs_id), len(reuters.categories())))
reuters_categories = reuters.categories()
i = 0
for docs in docs_id:
if i % 100 == 0:
print(i)
for category in reuters.categories(docs):
output[i, reuters_categories.index(category)] = 1
i += 1
return output
def load_data(valid_percent=0.1):
"""
Load the Reuters dataset.
Returns:
raw text and raw labels for train, valid, test set.
"""
nltk.download('reuters')
n_classes = 90
labels = reuters.categories()
documents = reuters.fileids()
test = [d for d in documents if d.startswith('test/')]
train = [d for d in documents if d.startswith('training/')]
docs = {}
docs['train'] = [reuters.raw(doc_id) for doc_id in train]
docs['test'] = [reuters.raw(doc_id) for doc_id in test]
ys = {'train': [], 'test': []}
ys['train'] = [reuters.categories(doc_id) for doc_id in train]
ys['test'] = [reuters.categories(doc_id) for doc_id in test]
# Validation
n_valid = int(valid_percent * len(ys['train']))
np.random.seed(5)
idxs = np.random.choice(len(ys['train']), n_valid, replace=False)
idx_set = set(idxs)
docs['valid'] = []
ys['valid'] = []
train_docs = []
train_y = []
for idx, (x, y) in enumerate(zip(docs['train'], ys['train'])):
if idx in idx_set:
docs['valid'].append(x)
ys['valid'].append(y)
else:
train_docs.append(x)
train_y.append(y)
data = {
'x_train': train_docs,
'y_train': train_y,
'x_valid': docs['valid'],
'y_valid': ys['valid'],
'x_test': docs['test'],
'y_test': ys['test'],
'labels': labels
}
return data
def load_data():
docs = reuters.fileids()
train_ids = [doc for doc in docs if doc.startswith("train")]
test_ids = [doc for doc in docs if doc.startswith("test")]
train_data = pd.DataFrame([(reuters.raw(id), reuters.categories(id)[0])
for id in train_ids],
columns=('text', 'labels'))
test_data = pd.DataFrame([(reuters.raw(id), reuters.categories(id)[0])
for id in test_ids],
columns=('text', 'labels'))
return train_data, test_data
def loadReutersData(documents,labels):
categories_list=['acq','crude','earn','grain','interest','money-fx','ship','trade']
docCount=0
for i in range(0,len(categories_list)):
category_docs = reuters.fileids(categories_list[i])
print (categories_list[i])
for document_id in reuters.fileids(categories_list[i]):
if(len(reuters.categories(document_id))==1):
content=str(reuters.raw(document_id))
soup = BeautifulSoup(content)
content=soup.get_text()
documents.append(content)
docCount+=1
labels.append(str(reuters.categories(document_id)))
def stats(self):
"""
:return: Important statistics about the dataset - numbers of documents in different classes with
corresponding percentages, as well as vocabulary sizes for every class.
"""
lt = LemmaTokenizer()
train_stats = {}
test_stats = {}
for c in reuters.categories():
train_stats[c] = {
'num_of_docs': 0,
'percentage': 0.0,
'words': set([])
}
test_stats[c] = {
'num_of_docs': 0,
'percentage': 0.0,
'words': set([])
}
for d in self.train:
c = reuters.categories(d)[0]
train_stats[c]['num_of_docs'] += 1
train_stats[c]['words'] |= set(lt.lemma_tokenize(reuters.raw(d)))
for d in self.test:
c = reuters.categories(d)[0]
test_stats[c]['num_of_docs'] += 1
test_stats[c]['words'] |= set(lt.lemma_tokenize(reuters.raw(d)))
s_train = sum(train_stats[c]['num_of_docs']
for c in train_stats.keys())
s_test = sum(test_stats[c]['num_of_docs'] for c in test_stats.keys())
res = ({}, {})
for c in train_stats.keys():
if train_stats[c]['num_of_docs'] != 0:
train_stats[c][
'percentage'] = train_stats[c]['num_of_docs'] / s_train
train_stats[c]['words'] = len(train_stats[c]['words'])
res[0][c] = train_stats[c]
for c in test_stats.keys():
if test_stats[c]['num_of_docs'] != 0:
test_stats[c][
'percentage'] = test_stats[c]['num_of_docs'] / s_test
test_stats[c]['words'] = len(test_stats[c]['words'])
res[1][c] = test_stats[c]
return res
def create_train_data(docs, dictionary):
all_topics = reuters.categories()
train_data = []
for i in range(len(docs)):
# Process 1 raw document to list without numbers, signs, etc.
wordlist = process_doc(docs[i])
len_wordlist = len(wordlist)
# Remove stop words
wordlist = remove_stop_words(wordlist)
len_wordlist_no_sw = len(wordlist)
# Number of stop words in document
sw_count = len_wordlist - len_wordlist_no_sw
# Replace words from doc not included in our dictionary by __OOV__
fv = []
fv_nn = []
for word in dictionary: # v tvare list slovnikov [ {2:x} , {5:y} ...]
if word[-1] in wordlist: # x, y
count = wordlist.count(
word[-1]) # pocet vyskytov daneho slova v dokumente
# fv.append(dict({count:word[-1]})) # human readable FV
# fv_nn.append(count) # NN readable FV
fv_nn.append(((count / len_wordlist) *
100)) # vyskyt daneho slova v dokumente v %
else:
# fv.append('__OOV__')
fv_nn.append(0.)
# Pocet vsetkych slov dokumentu, pripojime na koniec FV
# fv.append(len_wordlist)
fv_nn.append(len_wordlist)
# Pocet stop-slov v dokumente, v percentach pripojime na koniec FV
# fv.append(float("{0:.2f}".format((sw_count/len_wordlist)*100)))
# fv_nn.append(float("{0:.2f}".format((sw_count/len_wordlist)*100)))
fv_nn.append(((sw_count / len_wordlist) * 100))
# Na akej pozicii sa nachadza topic v zozname vsetkych topicov, jeho pozicia je UNIQUE, pripojime na koniec FV
doc_topic = reuters.categories(docs[i])
topic_id = all_topics.index(doc_topic[0])
fv_nn.append(topic_id)
# V kazdom cykle spracujeme 1 dokument a prilepime jeho vektor vlastnosti + topic id k trenovacim datam
train_data.append(fv_nn)
return train_data # all Feature Vectors as list + result topic
def create_new_dataset(train_docs_id, test_docs_id, top10_categories):
#train data
new_train_docs_id = []
y__train = []
instaces_vector = [0, 0] #vettore per contare istanze di earn e di acq
for train_doc in train_docs_id:
max_instances = float('inf')
new_category = ''
for doc_category in reuters.categories(train_doc):
for i in range(0, len(top10_categories)):
if doc_category == top10_categories[i][
1] and max_instances > top10_categories[i][0]:
new_category = doc_category
max_instances = top10_categories[i][0]
if new_category != '': #se il documento ha almeno una classe appartenente alla top10
if new_category == u'earn':
if instaces_vector[0] < 500:
instaces_vector[0] += 1
new_train_docs_id.append(train_doc)
y__train.append(new_category)
elif new_category == u'acq':
if instaces_vector[1] < 500:
instaces_vector[1] += 1
new_train_docs_id.append(train_doc)
y__train.append(new_category)
else:
new_train_docs_id.append(train_doc)
y__train.append(new_category)
# test data
new_test_docs_id = []
y__test = []
instaces_vector = [0, 0]
for test_doc in test_docs_id:
max_instances = float('inf')
new_category = ''
for doc_category in reuters.categories(test_doc): #ciclo sui documenti
for i in range(0, len(top10_categories)):
if doc_category in top10_categories[i][
1] and max_instances > top10_categories[i][0]:
new_category = doc_category
max_instances = top10_categories[i][0]
if new_category != '': # se il documento ha almeno una classe appartenente alla top10
new_test_docs_id.append(test_doc)
y__test.append(new_category)
return new_train_docs_id, y__train, new_test_docs_id, y__test
def create_tfidf_data(docs,categories,n=None):
"""
Crea una struttura [(label,[parole])] parsando il documento
:param docs: lista dei documenti reuters
:param categories: nomi delle categorie da considerare
:param n: numero di documenti da usare
:return: list
"""
if n:
docs = docs[:n]
cat_num = {}; i = 1
for c in categories:
cat_num[c] = i
i += 1
y = []
corpus = []
for d in docs:
c = reuters.categories(d)[0]
if c in categories:
y.append(getSVMCategory(cat_num[c]))
corpus.append(reuters.raw(d).lower())
return y, corpus
def categorize_reuters():
'''
Parses dataset to only examine documents associated
with a single category.
'''
categories = {}
for file_id in reuters.fileids():
if len(reuters.categories(file_id)) == 1:
cat = reuters.categories(file_id)[0]
if cat not in categories.keys():
categories[cat] = {}
text = reuters.raw(file_id)
categories[cat][file_id.replace('/', '_')] = text
return categories
def get_testset_trainset_nltk_reuters():
from nltk.corpus import reuters
global categories_file_name_dict
global cat_num_docs
clean_files = [f for f in reuters.fileids() if len(reuters.categories(fileids=f))==1]
testset = [f for f in clean_files if f[:5]=='test/']
trainset = [f for f in clean_files if f[:9]=='training/']
for cat in reuters.categories():
li=[f for f in reuters.fileids(categories=cat) if f in trainset]
li_te = [f for f in reuters.fileids(categories=cat) if f in testset]
if len(li)>20 and len(li_te)>20:
cat_num_docs[cat]=len(li)
li.extend(li_te)
categories_file_name_dict[cat]=li
return [[ f for f in trainset if f2c('reuters',f) in categories_file_name_dict],
[ f for f in testset if f2c('reuters',f) in categories_file_name_dict]]
def f2c(corpus,fileName):
if corpus=='mr':
from nltk.corpus import movie_reviews as mr
return mr.categories(fileids = fileName)[0]
else:
from nltk.corpus import reuters
return reuters.categories(fileids = fileName)[0]
def reuters_high_info_words(score_fn=BigramAssocMeasures.chi_sq):
labeled_words = []
for label in reuters.categories():
labeled_words.append((label, reuters.words(categories=[label])))
return high_information_words(labeled_words, score_fn=score_fn)
def collection_stats():
# List of documents
documents = reuters.fileids()
print(str(len(documents)) + " documents");
train_docs = list(filter(lambda doc: doc.startswith("train"), documents));
print(str(len(train_docs)) + " total train documents");
test_docs = list(filter(lambda doc: doc.startswith("test"), documents));
print(str(len(test_docs)) + " total test documents");
# List of categories
categories = reuters.categories();
print(str(len(categories)) + " categories");
# Documents in a category
category_docs = reuters.fileids("acq");
# Words for a document
document_id = category_docs[0]
document_words = reuters.words(category_docs[0]);
print(document_words);
# Raw document
print(reuters.raw(document_id));
def collection_stats():
# List of documents
documents = reuters.fileids()
print(str(len(documents)) + " documents")
# List of categories
categories = reuters.categories()
print(str(len(categories)) + " categories")
docs_per_category = list()
# Documents in a category
for category in categories:
category_docs = reuters.fileids(category)
print('for the following category: {} this is the amount of docs: {}'.
format(category, len(category_docs)))
docs_per_category.append(len(category_docs))
print('mean of docs per category is: {}'.format(
np.mean(np.array(docs_per_category))))
print('standard deviation of docs per category is: {}'.format(
np.std(np.array(docs_per_category))))
print('this is the min docs per category: {}'.format(
min(docs_per_category)))
print('this is the max docs per category: {}'.format(
max(docs_per_category)))
def collection_stats():
# List of documents
documents = reuters.fileids()
print(str(len(documents)) + " documents")
train_docs = list(filter(lambda doc: doc.startswith("train"), documents))
print(str(len(train_docs)) + " total train documents")
test_docs = list(filter(lambda doc: doc.startswith("test"), documents))
print(str(len(test_docs)) + " total test documents")
# List of categories
categories = reuters.categories()
print(str(len(categories)) + " categories")
# Documents in a category
category_docs = reuters.fileids("acq")
# Words for a document
document_id = category_docs[0]
document_words = reuters.words(category_docs[0])
print(document_words)
# Raw document
print(reuters.raw(document_id))
def reuters_high_info_words(score_fn=BigramAssocMeasures.chi_sq): labeled_words = [] for label in reuters.categories(): labeled_words.append((label, reuters.words(categories=[label]))) return high_information_words(labeled_words, score_fn=score_fn)
def get_documents():
"""
Get documents from 20 News Groups, Movie Reviews and Reuters corpora.
Returns:
list of str: Small subset of documents from News Groups, Movie Reviews
and Reuters corpora
"""
dataset = fetch_20newsgroups(subset='all',
shuffle=True,
remove=('headers', 'footers', 'quotes'))
corpus_20newsgroups = dataset.data[:5]
tuples = [(movie_reviews.raw(fileid), category)
for category in movie_reviews.categories()
for fileid in movie_reviews.fileids(category)]
corpus_movies = [tuple_[0] for tuple_ in tuples]
shuffle(corpus_movies)
corpus_movies = corpus_movies[:5]
tuples = [(reuters.raw(fileid), reuters.categories(fileid))
for fileid in reuters.fileids()]
corpus_reuters = [tuple_[0] for tuple_ in tuples]
shuffle(corpus_reuters)
corpus_reuters = corpus_reuters[:5]
corpus = list()
corpus.extend(corpus_20newsgroups)
corpus.extend(corpus_movies)
corpus.extend(corpus_reuters)
return corpus
def __run2__(trainDocs, testDocs):
"""
This method takes the filtered&processed train and processed test docs and performs the nearest neighbor retrieve
with n=k. With this result, the k nearest neighbors of this nearest neighbor are categorized using kNN similairty scoring
and the required values necessary for F1 evaluation are returned.
"""
#testDocs is of form {docId : doc_vec}
fp = 0
tp = 0
fn = 0
for docId, vec in testDocs.items():
nearest_neighbors = hyperplaneClassifier.nearestNeighbors(
trainDocs, docId, vec)
cats = set(
hyperplaneClassifier.categorize_kNNSimScoring(
testDocs, trainDocs, docId, nearest_neighbors))
print(cats)
actual_cats = set(reuters.categories(docId))
print(actual_cats)
print("\n")
fp += len(cats.difference(actual_cats))
tp += len(cats.intersection(actual_cats))
fn += len(actual_cats.difference(cats))
return fp, tp, fn
def import_reuters_files(ds, silent=False, log=sys.stdout):
"""
Import the brown corpus into `ds`. E.g.
>>> from nathan.core import Dataspace
>>> ds = Dataspace()
>>> %time brown.import_brown(ds, silent=True)
CPU times: user 12min 28s, sys: 536 ms, total: 12min 29s
Wall time: 12min 29s
"""
if not silent:
total = len(reuters.fileids())
counter = 0
root_handle = ds.insert("#reuters")
for fileid in reuters.fileids():
tags = ["@%s" % category for category in reuters.categories(fileid)]
file_handle = ds.insert(["#%s" % fileid] + tags)
ds.link(root_handle, file_handle)
for sent in reuters.sents(fileid):
norm = [word.lower() for word in sent]
sen_handle = ds.insert(norm)
ds.link(file_handle, sen_handle)
if not silent:
counter += 1
if (counter % 10 == 0):
print("importing %s of %s files..." % (counter, total),
file=log)
def __init__(self):
# Generate training set from sample of Reuters corpus
train_docs = [(self.bag_of_words(reuters.words(fileid)), category)
for category in reuters.categories()
for fileid in reuters.fileids(category) if
fileid.startswith("train")]
# Create a classifier from the training data
self.classifier = NaiveBayesClassifier.train(train_docs)
def format_data(docs, all_categories):
y = []; corpus = []
for d in docs:
current_categories = filter(lambda x: x in all_categories,reuters.categories(d))
if current_categories:
y.append(current_categories[0])
corpus.append(reuters.raw(d).lower())
return y, corpus
def makeWordSet(args=None):
'''Use the Brown corpus to see how many words used'''
word_set = set()
for cat in brown.categories():
word_set = word_set.union(set(brown.words(categories=cat)))
for cat in reuters.categories():
word_set = word_set.union(set(reuters.words(categories=cat)))
return word_set
def __init__(self, dataset=''):
"""
Docs in reuters corpus are identified by ids like "training|test/xxxx".
:param dataset: filter for ids
"""
self.dataset = dataset # filter docs
self.categories = {c: n for n, c in enumerate(reuters.categories())} # map class with int
self.docs = {d: n for n, d in enumerate(reuters.fileids())} # map docs with int
self.category_mask = [] # mask nth doc with its ith class
def __iter__(self):
""" Generator of docs while collecting ordered structured info. """
for n, reutersid in enumerate(reuters.fileids()): # 'training|test/xxxx'
dataset, _ = reutersid.split('/') # extract dataset
if self.dataset in dataset: # yield only filtered dataset
if self.categories is not None:
top_category = reuters.categories(reutersid)[0] # grab first category only
self.category_mask.append(self.categories[top_category]) # n-th doc -> classid
yield reuters.raw(reutersid) # return raw document
def reuters_train_test_feats(feature_detector=bag_of_words):
train_feats = []
test_feats = []
for fileid in reuters.fileids():
if fileid.startswith('training'):
featlist = train_feats
else: # fileid.startswith('test')
featlist = test_feats
feats = feature_detector(reuters.words(fileid))
labels = reuters.categories(fileid)
featlist.append((feats, labels))
return train_feats, test_feats
def create_tfidf_data(docs,n=None):
"""
Crea una struttura [(label,[parole])] togliendo le stopwords
e parsando il documento
:param docs: lista dei documenti reuters
:param n: numero di documenti da usare
:return: list
"""
if n:
docs = docs[:n]
y = [reuters.categories(d)[0] for d in docs]
corpus = [reuters.raw(d).lower() for d in docs]
return y, corpus
def makeData(file, set):
labels = []
f = open(file, "w")
for doc in set:
title = []
label = reuters.categories(doc)[0]
labels.append(label)
for i in reuters.words(doc):
if not i.isupper():
break
else:
title.append(i)
f.write(' '.join(title) + "\n")
f.close()
f = open("labels" + file, "w")
f.write("\n".join(labels))
f.close()
def computeStats(self, categories):
files = batchReadReuters('training', categories)
for file_name in files:
raw_txt = readFromFile('/home/dales3d/nltk_data/corpora/reuters/' + file_name)
fileCategories = reuters.categories(file_name)
#for cat in categories:
# if cat not in self.activeCategories:
# self.activeCategories.append(cat)
self.activeCategories = categories
words = extractWords(raw_txt)
keywords = meter(words)
for word in keywords:
if word not in self.wordsStatDict:
self.wordsStatDict[word] = WordStats()
w_stat = self.wordsStatDict[word]
w_stat.word = word
w_stat.addText(file_name, keywords[word], fileCategories)
def reuters():
reuters.fileids()
reuters.categories()
reuters.categories('training/9865')
reuters.categories(['training/9865', 'training/9880'])
reuters.fileids('barley')
reuters.fileids(['barley', 'corn'])
reuters.words('training/9865')[:14]
reuters.words(['training/9865', 'training/9880'])
reuters.words(categories='barley')
reuters.words(categories=['barley', 'corn'])
def exercise_reuters():
print reuters.fileids()
print reuters.categories()
# 查看单个文档的主题
print reuters.categories("training/9865")
# 查看多个文档的主题
print reuters.categories(["training/9865", "training/9880"])
# 查看每个主题的文档
print reuters.fileids("barley")
# 查看多个主题的文档
print reuters.fileids(["barley", "corn"])
# 查看某个文档的词汇
print reuters.words("training/9865")
# 查看多个文档的词汇
print reuters.words(["training/9865", "training/9880"])
# 查看某个主题的词汇
print reuters.words(categories="barley")
# 查看多个主题的词汇
print reuters.words(categories=["barley", "corn"])
from nltk.tokenize import word_tokenize
from sklearn.preprocessing.label import MultiLabelBinarizer
nltk.download('reuters')
nltk.download('punkt')
google_news_word2vec_model_location = 'data/GoogleNews-vectors-negative300.bin.gz'
doc2vec_model_location = 'model/doc2vec-model.bin'
doc2vec_dimensions = 300
classifier_model_location = 'model/classifier-model.bin'
doc2vec = Doc2Vec.load(doc2vec_model_location)
# Convert the categories to one hot encoded categories
labelBinarizer = MultiLabelBinarizer()
labelBinarizer.fit([reuters.categories(fileId) for fileId in reuters.fileids()])
# Convert load the articles with their corresponding categories
train_articles = [{'raw': reuters.raw(fileId), 'categories': reuters.categories(fileId)} for fileId in reuters.fileids() if fileId.startswith('training/')]
test_articles = [{'raw': reuters.raw(fileId), 'categories': reuters.categories(fileId)} for fileId in reuters.fileids() if fileId.startswith('test/')]
shuffle(train_articles)
shuffle(test_articles)
# Convert the articles to document vectors using the doc2vec model
train_data = [doc2vec.infer_vector(word_tokenize(article['raw'])) for article in train_articles]
test_data = [doc2vec.infer_vector(word_tokenize(article['raw'])) for article in test_articles]
train_labels = labelBinarizer.transform([article['categories'] for article in train_articles])
test_labels = labelBinarizer.transform([article['categories'] for article in test_articles])
train_data, test_data, train_labels, test_labels = numpy.asarray(train_data), numpy.asarray(test_data), numpy.asarray(train_labels), numpy.asarray(test_labels)
# Initialize the neural network
def load_reuters(setName):
html = HTMLParser.HTMLParser()
doc_ids = reuters.fileids()
cat2all_ids = {}
cat2train_ids = {}
cat2test_ids = {}
cat2all_num = {}
cand_docNum = 0
for doc_id in doc_ids:
# only choose docs belonging in one category
if len( reuters.categories(doc_id) ) == 1:
cat = reuters.categories(doc_id)[0]
cand_docNum += 1
if doc_id.startswith("train"):
cat2set_ids = cat2train_ids
else:
cat2set_ids = cat2test_ids
if cat in cat2set_ids:
cat2set_ids[cat].append(doc_id)
else:
cat2set_ids[cat] = [ doc_id ]
# both train and test doc_ids are put in cat2all_ids
if cat in cat2all_ids:
cat2all_ids[cat].append(doc_id)
else:
cat2all_ids[cat] = [ doc_id ]
if cat in cat2all_num:
cat2all_num[cat] += 1
else:
cat2all_num[cat] = 1
print "Totally %d docs, %d single-category docs in %d categories" %( len(doc_ids),
cand_docNum, len(cat2train_ids) )
sorted_cats = sorted( cat2all_num.keys(), key=lambda cat: cat2all_num[cat],
reverse=True )
catNum = 10
cats_docsWords = [ [] for i in xrange(catNum) ]
cats_docNames = [ [] for i in xrange(catNum) ]
topN_cats = sorted_cats[:catNum]
print "Top 10 categories:"
keptAllDocNum = 0
keptTrainDocNum = 0
keptTestDocNum = 0
for cat in topN_cats:
print "%s: %d/%d" %( cat, len(cat2train_ids[cat]), len(cat2test_ids[cat]) )
keptTrainDocNum += len(cat2train_ids[cat])
keptTestDocNum += len(cat2test_ids[cat])
keptAllDocNum += len(cat2train_ids[cat]) + len(cat2test_ids[cat])
print "Totally %d docs kept, %d in train, %d in test" %( keptAllDocNum,
keptTrainDocNum, keptTestDocNum )
if setName == "train":
cat2set_ids = cat2train_ids
setDocNum = keptTrainDocNum
elif setName == "test":
cat2set_ids = cat2test_ids
setDocNum = keptTestDocNum
elif setName == "all":
cat2set_ids = cat2all_ids
setDocNum = keptAllDocNum
else:
raise Exception("Unknown set name %s" %setName)
orig_docs_name = []
orig_docs_cat = []
orig_docs_words = []
readDocNum = 0
totalLineNum = 0
emptyFileNum = 0
for cat_id, cat in enumerate(topN_cats):
for doc_id in cat2set_ids[cat]:
if readDocNum % 50 == 49 or readDocNum == setDocNum - 1:
print "\r%d %d\r" %( readDocNum + 1, totalLineNum ),
text = html.unescape( reuters.raw(doc_id) )
text = text.encode("utf-8")
lines = text.split("\n")
if len(text) == 0 or len(lines) == 0:
emptyFileNum += 1
continue
readDocNum += 1
totalLineNum += len(lines)
text = " ".join(lines)
wordsInSentences, wc = extractSentenceWords(text)
filename = doc_id
orig_docs_words.append( wordsInSentences )
orig_docs_name.append(filename)
orig_docs_cat.append(cat_id)
cats_docsWords[cat_id].append(wordsInSentences)
cats_docNames[cat_id].append(filename)
print "Done. %d docs read, %d empty docs skipped. Totally %d lines" %(readDocNum, emptyFileNum, totalLineNum)
return setDocNum, orig_docs_words, orig_docs_name, orig_docs_cat, \
cats_docsWords, cats_docNames, topN_cats
print m + ':', fdist[m]
cfd = nltk.ConditionalFreqDist(
(genre, word)
for genre in brown.categories()
for word in brown.words(categories=genre))
genres = ['news', 'religion', 'hobbies', 'science_fiction', 'romance', 'humor']
modals = ['can', 'could', 'may', 'might', 'must', 'will']
cfd.tabulate(conditions=genres, samples=modals)
#路透语料库
from nltk.corpus import reuters
reuters.fileids()
reuters.categories()
reuters.categories(['training/9865', 'training/9880'])
reuters.fileids(['barley', 'corn'])
reuters.words('training/9865')[:14]
reuters.words(['training/9865', 'training/9880'])
reuters.words(categories=['barley', 'corn'])
#演说语料库
from nltk.corpus import inaugural
inaugural.fileids()
#多国世界人权宣言
from nltk.corpus import udhr
languages = ['Chickasaw', 'English', 'German_Deutsch','Greenlandic_Inuktikut', 'Hungarian_Magyar', 'Ibibio_Efik']
cfd = nltk.ConditionalFreqDist(
(lang, len(word))
def first_occurrence_perc(self, term, document):
return term.first_occurrence(document) / len(document.doc)
# def terminals(self, term, document):
# return (
# self.bool(term, document), self.tf(term, document), self.tf_idf(term, document), self.tf_ig(term, document),
# self.tf_chi(term, document), self.tf_rf(term, document))
def raw_terminals(self, term, document):
return (self.bool(term, document), self.tf(term, document), self.max_prob_term_and_category(term, document),
self.max_prob_term_not_category(term, document), self.avg_prob_term_category(term, document),
self.avg_prob_term_not_category(term, document), self.first_occurrence_perc(term, document))
if __name__ == '__main__':
training_fileids = fileids = filter(lambda fileid: "training" in fileid and len(reuters.categories(fileid)) == 1,
reuters.fileids())
documents = [sum(reuters.sents(fid), []) for fid in training_fileids]
doc = documents[0]
term = terminals.WordTerm("in")
docs_categories = [reuters.categories(fid)[0] for fid in training_fileids]
print docs_categories
print doc
fe = TWSCalculator(documents, docs_categories)
print "tf =", fe.tf(term, doc), "idf =", fe.idf(term), "tf-idf =", fe.tf_idf(term, doc)
term = terminals.WordTerm("in")
print 'TF-CHI: ', fe.tf_chi(term, doc)
print 'TF-CHI: ', fe.tf_chi(term, doc)
for word in flat_feat_pruned: features['%s' % word]=doc.count(word) return features #full_feat=[(doc_features(cfd[condition].keys()),condition=='gold') for condition in cfd.conditions()] #------------------------------------- #Use chosen features to create train/test sets #either based on boolean or count of features in docs #------------------------------------- #reutDocs=[(list(reuters.words(fileid)),cat) #better way: lower, stem, and only keep alpha numeric reutDocs=[([porter.stem(a.lower()) for a in reuters.words(fileid) if re.findall(r"[^\W\d]",a)] ,cat) for cat in reuters.categories() for fileid in reuters.fileids(cat)] #randomize for later test/train split random.seed(1979) random.shuffle(reutDocs) #run feature extractor on reutDocs instead of cfd; pickled as 'featureset.pkl' #Boolean based features e.g. 1 or 0 for each word in flat_feat_pruned per document featureset=[(doc_features(d),c) for (d,c) in reutDocs] #Count based features count_featureset=[(count_features(d),c) for (d,c) in reutDocs] #-------------------------------------
def encode_doc(doc):
d = np.zeros((1, max_len-1, n_chars), dtype=np.bool)
for p, j in enumerate(doc.lower()[:max_len]):
d[0, p, char_to_idx[j]] = 1
return d
# load or create the character encoding dictionaries
if os.path.exists(char_idx_path):
with open(char_idx_path, 'rb') as f:
logger.info('Loading character encodings from "%s"' % char_idx_path)
idx_to_char = pickle.load(f)
char_to_idx = pickle.load(f)
cat_enc = pickle.load(f)
else:
n_docs = len(reuters.fileids())
cat_enc = dict((x, i+1) for i, x in enumerate(set(reuters.categories())))
chars = set()
for fid in reuters.fileids():
chars = chars.union(set(reuters.raw(fid).lower()))
idx_to_char = dict((i, c) for i, c in enumerate(chars))
char_to_idx = dict((c, i) for i, c in enumerate(chars))
with open(char_idx_path, 'wb') as f:
logger.info('Saving character encodings to "%s"' % char_idx_path)
pickle.dump(idx_to_char, f)
pickle.dump(char_to_idx, f)
pickle.dump(cat_enc, f)
if os.path.exists(reuters_enc_path):
# Logistic Regression parameters
ITERATIONS = 800
ALPHA = 0.1
THRESHOLD = 0.5
#LAMBDA = 1
## Extract the fileids of the necessary subset of documents ##
documents_fileids = reuters.fileids(CATEGORIES)
## Split into training and testing ##
training_fileids = [w for w in documents_fileids if w.startswith('training')]
testing_fileids = [w for w in documents_fileids if w.startswith('test')]
## Extract features ##
most_frequent_words = extract_most_frequent_words(training_fileids, NUM_MOST_FREQUENT)
training_featureset = [(document_features(reuters.words(fileid), most_frequent_words), reuters.categories(fileid)) for fileid in training_fileids]
testing_featureset = [(document_features(reuters.words(fileid), most_frequent_words), reuters.categories(fileid)) for fileid in testing_fileids]
## Train a classifier ##
# Create a matrix with the values of the features to send to the classifier
training_matrix = np.array([list(x.values()) for x, y in training_featureset])
# Create a matrix with only the classes labels of each document
classes_vector = [y for x, y in training_featureset]
n = training_matrix.shape[1] # Number of features
m = len(training_matrix) # Number of training documents
# Add the bias term to the training matrix
training_matrix = np.concatenate((np.ones((m,1)), training_matrix), axis = 1)
# Create ten classifiers
classifiers = dict( (c, np.zeros((n+1,1)) ) for c in CATEGORIES )