Session Ready
Exercise

Dissecting the best flight duration model

You just set up a CrossValidator to find good parameters for the linear regression model predicting flight duration.

Now you're going to take a closer look at the resulting model, split out the stages and use it to make predictions on the testing data.

The following have already been created:

  • cv — a trained CrossValidatorModel object and
  • evaluator — a RegressionEvaluator object.

The flights data have been randomly split into flights_train and flights_test.

Instructions
100 XP
  • Retrieve the best model.
  • Look at the stages in the best model.
  • Isolate the linear regression stage and extract its parameters.
  • Use the best model to generate predictions on the testing data and calculate the RMSE.