title: Why are some variables and comments in my IPython notebook red?
body: <p>Is this a syntax highlighting issue in my iPython notebook?  Can I remove it?  This happens in some of my cells, but not others.</p>
  
  <p><a href="https://i.stack.imgur.com/SOPI0.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SOPI0.png" alt="ipython red text"></a></p>
  
  <p>I'm viewing <a href="https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/udacity/2_fullyconnected.ipynb" rel="noreferrer">this iPython notebook</a>.</p>