title: How do I stop Keras showing "using XXX backend"?
body: <p>"Using XXX backend" would print when I import keras.</p>
  
  <pre><code>import keras
  </code></pre>
  
  <p>Outputs:</p>
  
  <pre><code>Using TensorFlow backend.
  </code></pre>
  
  <p>But I clearly know what I am using.</p>
  
  <p>How to disable it?</p>