title: ImportError: No module named 'sklearn.lda'
body: <p>When I run <code>classifier.py</code> in the openface demos directory using: </p>
  
  <p><code>classifier.py train ./generated-embeddings/</code></p>
  
  <p>I get the following error message:</p>
  
  <blockquote>
    <p>--> from sklearn.lda import LDA</p>
    
    <p>ModuleNotFoundError: No module named 'sklearn.lda'.</p>
  </blockquote>
  
  <p>I think to have correctly installed sklearn.</p>
  
  <p>What could be the reason for this message?</p>