title: Does sklearn time cpu time or wall time
body: <p>Are the returned timing values for the random and grid search implementations of sklearn in CPU or wall time? All I can find in the documentation is the following:</p>
  
  <blockquote>
    <p>The mean_fit_time, std_fit_time, mean_score_time and std_score_time
    are all in seconds.</p>
  </blockquote>
  
  <p>So I am assuming that would mean wall time as the default, is this correct? </p>