count unique words
count unique words

mayk93/nltk-trainer,VinACE/nltk-trainer,VinACE/nltk-trainer,fengzhyuan/nltk-trainer,japerk/nltk-trainer,mayk93/nltk-trainer,ephillipe/nltk-trainer,fengzhyuan/nltk-trainer,japerk/nltk-trainer,ephillipe/nltk-trainer