[{'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:cluster_list = [first_clust, second_clust, third_clust, fourth_clust]\nfor cluster in cluster_list:\ncluster[\'gender\'] = (cluster.replace(to_replace = [1,2],\nvalue=["Male",\n"Female"]).gender)\ncluster[\'level_of_education\'] = (cluster.replace(to_replace = [1,2,3,4,5],\nvalue=["University",\n"High School",\n"Elementary",\n"Read and Write",\n"Cannot Read or Write"]).level_of_education)\ncluster[\'employment\'] = (cluster.replace(to_replace = [1,2,3],\nvalue=["Employed",\n"Unemployed",\n"Student"]).employment)\ncluster[\'urban_or_rural\'] = (cluster.replace(to_replace = [1,2,0],\nvalue=["Rural",\n"Urban",\n"Missing"]).urban_or_rural)\ncluster[\'age\'] = (cluster.replace(to_replace = [1,2,3,4,5],\nvalue=["15-19",\n"20-29",\n"30-29",\n"40-60",\n"x>60"]).age)\ncluster[\'region\'] = (cluster.replace(to_replace = [1,2,3,4,5,6],\nvalue=["Azal",\n"Janid",\n"Tihama",\n"Hadramout",\n"Taiz",\n"Aden"]).region)'}, {'role': 'assistant', 'content': 'data_preprocessing'}]