[{'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:## Fonction split date\ndef date_split(df_train, df_test, date='datetime'):\n    ##Traitement_df_train\n    cols=df_train[date]\n    date_cols=pd.to_datetime(cols)\n    df_train['year'] = date_cols.dt.year\n    df_train['month'] = date_cols.dt.month\n    df_train['day'] = date_cols.dt.day\n    df_train['hour'] = date_cols.dt.hour\n    df_train['minute'] = date_cols.dt.minute\n    df_train['second'] = date_cols.dt.second\n    df_train = df_train.drop(['datetime'], axis=1)\n    ##Traitement_df_test\n    cols2=df_test[date]\n    date_cols2=pd.to_datetime(cols2)\n    df_test['year'] = date_cols2.dt.year\n    df_test['month'] = date_cols2.dt.month\n    df_test['day'] = date_cols2.dt.day\n    df_test['hour'] = date_cols2.dt.hour\n    df_test['minute'] = date_cols2.dt.minute\n    df_test['second'] = date_cols2.dt.second\n    df_test = df_test.drop(['datetime'], axis=1)\n    return df_train, df_test\n     \n    \n    "}, {'role': 'assistant', 'content': 'data_preprocessing'}]