def lda_pred(models, vocab, doc):
"""Get a class prediction for a document """
tokenized = word_tokenize_doc(doc)
vectorizer = CountVectorizer(min_df=1, vocabulary = vocab, stop_words=None)
X = vectorizer.fit_transform([' '.join(tokenized)])
label_score = []
for label, model in models.iteritems():
n_topics = len(model.components_)
topic_dist = model.transform(X)
log_likelihood = 0
for token in tokenized:
if token in vocab:
max_likelihood = -1 * 10 ** 8
for topic in range(n_topics):
ll = np.log(model.components_[topic][vocab[token]]) + np.log(topic_dist[0][topic])
max_likelihood = max_likelihood if max_likelihood > ll else ll
log_likelihood += max_likelihood
label_score.append((label, log_likelihood))
return max(label_score, key = lambda x:x[1])[0]
def hlda_pred(models, dictionary, doc):
corpus = [dictionary.doc2bow(word_tokenize_doc(doc))]
label_score = []
for label, hdp in models.iteritems():
label_score.append((label, hdp.evaluate_test_corpus(corpus)))
return max(label_score, key = lambda x:x[1])[0]
