[{'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:# Splitting date time data for date account created\ndata_all['dac_year'] = data_all.date_account_created.dt.year\ndata_all['dac_month'] = data_all.date_account_created.dt.month\ndata_all['dac_day'] = data_all.date_account_created.dt.day\n\n# Splitting date time data for time first active\ndata_all['tfa_year'] = data_all.timestamp_first_active.dt.year\ndata_all['tfa_month'] = data_all.timestamp_first_active.dt.month\ndata_all['tfa_day'] = data_all.timestamp_first_active.dt.day\n\ndata_all.drop('date_account_created',1, inplace=True)\ndata_all.drop('timestamp_first_active',1, inplace=True)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]