title: How may I calculate Accuracy in NLTK KMeans Clustering
body: <p>I am trying to use NLTK's KMeans Clustering Algorithm. 
  It is generally going fine. 
  I want to use the Metrics package of NLTK to determine precision,recall and f measure.</p>
  
  <p>I searched for some examples in web and in other references but may be without a clue. </p>
  
  <p>If any one may kindly cite an example or reference. 
  Thanks in Advance.   </p>