title: LexRank summarization algorithm
body: <p>I am working on an implementation of the <code>LexRank</code> (<a href="https://en.wikipedia.org/wiki/Automatic_summarization#Unsupervised_approaches%3a_TextRank_and_LexRank" rel="nofollow">link</a>) algorithm for a project.</p>
  
  <p>The thing I didn't understand about the algorithm is after I create the final matrix where the calculated tf-idf values are (after factoring their prestige). How do I create a summary?
  Do I just take the top-k sentences? Do I remove one sentence, add it to the summary and start the process again without it? or something else?</p>