Câu 18: Databricks Certified Machine Learning Associate

A data scientist wants to efficiently tune the hyperparameters of a scikit-learn model. They elect to use the Hyperopt library's fmin operation to facilitate this process. Unfortunately, the final model is not very accurate. The data scientist suspects that there is an issue with the objective_function being passed as an argument to fmin. They use the following code block to create the objective_function: Which of the following changes does the data scientist need to make to their objective_function in order to produce a more accurate model?

1. A. Add test set validation process
2. B. Add a random_state argument to the RandomForestRegressor operation
3. C. Remove the mean operation that is wrapping the cross_val_score operation
4. D. Replace the r2 return value with -r2 — đáp án hiện tại
5. E. Replace the fmin operation with the fmax operation