title: How to escape special characters in CNTK Text Reader?
body: <p>For a reader such as this reading a file in CTF format, </p>
  
  <pre><code>     query         = StreamDef(field='S0', shape=vocab_size,  is_sparse=True),
       intent        = StreamDef(field='S1', shape=num_intents, is_sparse=True),  
       slot_labels   = StreamDef(field='S2', shape=num_labels,  is_sparse=True)
  </code></pre>
  
  <p>How do I escape special charachter such as "|" if it is a token? 
  I am getting an warning for the line in the middle where the token itself is "|"</p>
  
  <p>48155   |S0 196:1 |# -  |S2 0:1 |# None</p>
  
  <p>48155   |S0 18217:1 |# |    |S2 0:1 |# None</p>
  
  <p>48155   |S0 3152:1 |# Cindy |S2 0:1 |# None</p>
  
  <p>I can remove these when creating the CFT file, but I was wondering how we  can handle this. 
  Thanks</p>