[{'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:score3 = []\nneighbor = []\nfor k in range(10, 100, 10):\n    knn = KNeighborsRegressor(n_neighbors=k, weights='distance')\n    score3.append(cross_val_score(knn, X_train, y_train, cv=10).mean())\n    neighbor.append(k)"}, {'role': 'assistant', 'content': 'modelling'}]