title: How to get best_estimator parameters from GridSearch using cross_val_score?
body: <p>I want to know the result of the GridSearch when I'm using nested cross validation with cross_val_score for convenience.</p>
  
  <p>When using cross_val_score, you get an array of scores. It would be useful to receive the fitted estimator back or a summary of the chosen parameters for that estimator.</p>
  
  <p>I know you can do this yourself but just implementing cross-validation manually but it is much more convenient if it can be done in conjunction with cross_val_score.</p>
  
  <p>Any way to do it or is this a feature to suggest?</p>