Evaluating model quality

It's now time to begin evaluating model quality.

Here, you will compare the RMSE and MAE of a cross-validated XGBoost model on the Ames housing data. As in previous exercises, all necessary modules have been pre-loaded and the data is available in the DataFrame df.

This exercise is part of the course

Extreme Gradient Boosting with XGBoost

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Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Create the DMatrix: housing_dmatrix
housing_dmatrix = xgb.DMatrix(data=X, label=y)

# Create the parameter dictionary: params
params = {"objective":"reg:squarederror", "max_depth":4}

# Perform cross-validation: cv_results
cv_results = ____(dtrain=____, params=____, nfold=____, num_boost_round=____, metrics=____, as_pandas=True, seed=123)

# Print cv_results
print(cv_results)

# Extract and print final boosting round metric
print((cv_results["____"]).tail(1))

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