[{'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:df=df[['Address', 'Minute', 'Hour', 'Day', 'Month', 'Year',\n       'District', 'DayOfWeek', 'X', 'Y', 'rot45_X', 'rot45_Y', 'rot30_X',\n       'rot30_Y', 'radial60', 'Intersection', 'Block', 'raw_radial',\n       'closest_centers_f', 'label']]\n\n\ndf_test=df_test[['Address', 'Minute', 'Hour', 'Day', 'Month', 'Year', 'District',\n       'DayOfWeek', 'X', 'Y', 'rot45_X', 'rot45_Y', 'rot30_X', 'rot30_Y',\n       'radial60', 'Intersection', 'Block', 'raw_radial', 'closest_centers_f',\n       'label']]"}, {'role': 'assistant', 'content': 'data_preprocessing'}]