[{'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:# we already have these, but for the sake of consistence, let\'s do it again\ntrain = df_train.merge(df_store)\ntest = df_test.merge(df_store)\n\ntrain["Promo2Active"] = get_Promo2Active(train)\ntrain["CompetitionActive"] = get_CompetitionActive(train)\n\ntest["Promo2Active"] = get_Promo2Active(test)\ntest["CompetitionActive"] = get_CompetitionActive(test)\''}, {'role': 'assistant', 'content': 'data_preprocessing'}]