[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': 'Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:def get_auc(X, y):\ncv = StratifiedKFold(y, n_folds=10)\nclassifier = GaussianNB()\nroc_aucs = list()\nfor i, (train,test) in enumerate(cv):\nprobas_ = classifier.fit(X[train], y[train]).predict_proba(X[test])\nfpr, tpr, thresholds = roc_curve(y[test], probas_[:,1])\nroc_aucs.append(auc(fpr, tpr))\nreturn np.mean(roc_aucs)'}, {'role': 'assistant', 'content': 'evaluation'}]