title: ImportError: No module named 'keras_contrib'
body: <p>I am trying to import Keras lib code to execute CRF using the import command below but an error raises as titled. Please share the solution for this.</p>
  
  <p>The command used to execute is </p>
  
  <pre><code>from keras_contrib.layers import CRF
  </code></pre>
  
  <blockquote>
    <p>Traceback (most recent call last):</p>
    
    <p>File "", line 1, in 
       from keras_contrib.layers import CRF</p>
    
    <p>ImportError: No module named 'keras_contrib'</p>
  </blockquote>