Furthermore, we use Stanford NLP core 7 and add the part-of-speech tagging feature which may help disambiguate those contextual words.
for each K size window surrounding the entity mention, we could extract four kinds of different features, i.e., bag of words (BOW), word sequence (WS), bag of words plus part-of-speech tagging (BOW + POS) and word sequence plus part-of-speech tagging (WS + POS).