[{'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:cols_train = ['Store', 'DayOfWeek', 'Date', 'Sales', 'Promo','PromoOpen',\n#               'shift_sales','shift_t7_sales', 'shift_t30_sales','shift_customer','shift_t7_customer', 'shift_t30_customer',\n           'StateHoliday', 'SchoolHoliday', 'StoreType', 'Assortment',\n           'CompetitionDistance', 'Promo2', 'Month', 'Year', 'Day','IsPromoMonth',\n#            'Sales_DayOfWeek', 'Sales_Promo', 'Sales_Promo2', 'Sales_Month', 'Sales_Year', 'Sales_Day', 'Sales_StateHoliday', 'Sales_StoreType',\n#            'Sales_Assortment', 'Customers_DayOfWeek', #'isBeforeCompetition', 'Customers_Promo', 'Customers_Promo2', 'Customers_Month',\n#            'Customers_Year', 'Customers_Day', 'Customers_StateHoliday','Customers_StoreType', 'Customers_Assortment',\n#            'CompetitionOpenSinceMonth', 'CompetitionOpenSinceYear',\n           'Sales_StrType_DayOfWeek','SalesPerCustomer_StrType_Assortment', 'Customers_StrType_Promo2',\n           'Sales_StrType_Promo', 'Sales_StrType_Promo2', 'Sales_StrType_Month','Customers_StrType_StateHoliday',\n           'Sales_StrType_Year', 'Sales_StrType_Day', 'Sales_StrType_StateHoliday','SalesPerCustomer_StrType_Promo2',\n           'Sales_StrType_Assortment', 'Customers_StrType_DayOfWeek', 'Customers_StrType_Promo', \n           'Customers_StrType_Month', 'Customers_StrType_Year', 'Customers_StrType_Day', 'SalesPerCustomer_StrType_StateHoliday',\n           'Customers_StrType_Assortment', 'SalesPerCustomer_StrType_DayOfWeek', 'SalesPerCustomer_StrType_Promo', \n           'SalesPerCustomer_StrType_Month', 'SalesPerCustomer_StrType_Year', 'SalesPerCustomer_StrType_Day', \n#          'Sales_StrType_Quarter', 'Customers_StrType_Quarter', 'Sales_Year_Quarter','Customers_Year_Quarter',   'Customers_Quarter','Sales_Quarter',\n#            'Quarter'\n             ]  "}, {'role': 'assistant', 'content': 'helper_functions'}]