title: training data format for NLTK punkt
body: <p>I would like to run <code>nltk</code> <code>Punkt</code> to split sentences. There is no training model so I train model separately, but I am not sure if the training data format I am using is correct.</p>
  
  <p>My training data is one sentence per line. I wasn't able to find any documentation about this, only this thread (<a href="https://groups.google.com/forum/#!topic/nltk-users/bxIEnmgeCSM" rel="nofollow noreferrer">https://groups.google.com/forum/#!topic/nltk-users/bxIEnmgeCSM</a>) sheds some light about training data format.</p>
  
  <p>What is the correct training data format for <code>NLTK</code> <code>Punkt</code> sentence tokenizer?</p>