I am currently going through the Stanford NLP course , particularly the N-grams part , fortunately thanks to Python's NLTK I can generate the frequency distribution and than probabilities , but doing this every time a query is fired (search suggestions) wont be economical. So I researched a bit on how to store them , but havent found any nice resource for it. Do anyone have some good resources on this topic? Also if some have some other resources for learning NLP , please share.