A data scientist is tasked with predicting house prices using Snowflake. They have a dataset stored in a Snowflake table called 'HOUSE PRICES' with columns such as 'SQUARE FOOTAGE, 'NUM BEDROOMS, 'LOCATION_ID, and 'PRICE. They choose a Random Forest Regressor model. Which of the following steps is MOST important to prevent overfitting and ensure good generalization performance on unseen data, and how can this be effectively implemented within a Snowflake-centric workflow?
Correct Answer: B
Hyperparameter tuning with cross-validation is crucial to prevent overfitting. By splitting the data into training and validation sets, we can evaluate the model's performance on unseen data and adjust the hyperparameters accordingly. Snowflake's 'QUALIFY' clause and temporary tables can be used to efficiently manage these splits. Using a maximum number of estimators without validation is prone to overfitting. Training on the entire dataset without validation provides no indication of generalization performance. Randomly selecting a subset of features may remove important predictors and eliminating outliers without proper investigation can skew your data and reduce the efficacy of the model.