title: Grid search parameters for Decision Tree
body: <p>I am using a decision tree classifier, and I want to use cv to find the best possible parameters. I may specify something as:</p>
  
  <pre><code>     parameter_grid = {
      'max_depth': range(2, 10),
      'max_features': range(2, 14)}
  </code></pre>
  
  <p>Firstly, how do I decide which parameter ranges to use? Is it random or there are best practices behind this? Another point is that once I have done this, is there a way to get each individual parameter and its value through code?  Thanks</p>