machine-learning × 143
nlp × 100
classification × 83
graphical-models × 28
natural-language-processing × 28
text-classification × 26
similarity × 24
features × 23
networks × 17
text-mining × 15
extraction × 11
ner × 10
network-analysis × 7
transfer-learning × 7
information-retrieval × 6
ontology × 6
noisy × 5
tf-idf × 5
kernels × 4
probabilistic × 4
text-categorization × 4
dependency-parsing × 3
social × 2
layout × 1
linux × 1
medical-text × 1
pdf × 1