[{'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:train["City Group"] = train["City Group"].map({"Big Cities": 0, "Other":1})\ntest["City Group"] = test["City Group"].map({"Big Cities": 0, "Other":1})\ntrain["Type"] = train["Type"].map({"FC": 0, "IL":1,"DT":2})\ntest["Type"] = test["Type"].map({"FC": 0, "IL":1,"DT":2})\n# Is city important or not\n#How can we get groups of revenue and plot it against city groups and types to compare'}, {'role': 'assistant', 'content': 'data_preprocessing'}]