def proc_corpus(docs):
"""
Preprocess the documents
Param:
---------
docs: list of string,
each string corresponds to a document
Return:
---------
docs: list of tokens(list of string),
each tokens corresponds to a preprocessed document
"""
return [transform(doc, ALL_PIPELINE_NAMES)
for doc in docs]
def main():
# parameters
collection_name = "nips"
years = xrange(2008, 2015) # 10 ~ 14
n_topics = 6
n_top_words = 15
# load corpus
corpus_paths = map(lambda y:
"data/{}-{}.dat".format(collection_name, y),
years)
all_corpus = []
year2corpus = {}
for year, path in zip(years, corpus_paths):
corpus = list(load_line_corpus(path))
all_corpus.append(corpus)
year2corpus[year] = corpus
all_corpus = list(itertools.chain.from_iterable(all_corpus))
preprocessor = lambda doc: ' '.join(transform(doc, ALL_PIPELINE_NAMES))
tokenizer = lambda doc: doc.split()
with codecs.open('data/lemur-stopwords.txt',
'r' 'utf8') as f:
stop_words = map(lambda s: s.strip(), f.readlines())
vectorizer = CountVectorizer(preprocessor=preprocessor,
tokenizer=tokenizer,
stop_words=stop_words,
min_df=5)
X = vectorizer.fit_transform(all_corpus)
id2word = {id_: word
for word, id_ in vectorizer.vocabulary_.items()}
# build the model
model = lda.LDA(n_topics=n_topics, n_iter=700,
# alpha=1.0, eta=1.0,
random_state=1)
model.fit(X)
# print topics
for i, topic_dist in enumerate(model.topic_word_):
top_word_ids = np.argsort(topic_dist)[:-n_top_words:-1]
topic_words = [id2word[id_] for id_ in top_word_ids]
print('Topic {}: {}'.format(i, ' '.join(topic_words)))
year2docs = {}
start_document_index = 0
for year in years:
corpus_size = len(year2corpus[year])
end_document_index = start_document_index + corpus_size
year2docs[year] = np.arange(start_document_index, end_document_index)
start_document_index = end_document_index
tbl = doc_topic_strengths_over_periods(model.doc_topic_, year2docs)
print tbl
print np.array(tbl.values())
