[{'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:b"month2str = {1:\'Jan\', 2:\'Feb\', 3:\'Mar\', 4:\'Apr\', 5:\'May\', 6:\'Jun\', \\\\\\n         7:\'Jul\', 8:\'Aug\', 9:\'Sept\', 10:\'Oct\', 11:\'Nov\', 12:\'Dec\'}\\nall_data[\'month_str\'] = all_data.Month.map(month2str)\\n\\ndef check(row):\\n    if isinstance(row[\'PromoInterval\'],str) and row[\'month_str\'] in row[\'PromoInterval\']:\\n        return 1\\n    else:\\n        return 0\\n\\nall_data[\'IsPromoMonth\'] =  all_data.apply(lambda row: check(row),axis=1)    "'}, {'role': 'assistant', 'content': 'data_preprocessing'}]