{"blocks": [{"key": "f8d4eeea", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "aa6393b2", "text": "BCG CodeSignal notebook – final model training task", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "96ab983f", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "c000974c", "text": "Train a GradientBoostingClassifier on the prepared data using 5-fold cross-validation, report mean ROC-AUC, and save the trained model to disk (model.pkl). Provide the full Python code.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "05aa12a0", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "daf3ca04", "text": "Pipeline ➜ cross_val_score ➜ joblib.dump.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}