title: Combining Doc2Vec sentences into paragraph vectors
body: <p>In Gensim's Doc2Vec, how do you combine sentence vectors to make a single vector for a paragraph?  I realise you can train on the entire paragraph, but it would obviously be better to train on individual sentences, for context, etc. (I think...?)</p>
  
  <p>Any advice or normal use case?</p>
  
  <p>Also, how would I retrieve sentence/paragraph vectors from the model?</p>