title: Invert MinMaxScaler from scikit_learn
body: <p>To feed my generative neural net, I need to normalize some data between -1 and 1.</p>
  
  <p>I do it with <code>MinMaxScaler</code> from Sklearn and it works great.
  Now, my generator is going to output data between -1 and 1.</p>
  
  <p>How to revert <code>MinMaxScaler</code> to get real data ?</p>