[{'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:input_var = {"no_of_evening_meal_with_1_parent_past_7_days": "H1WP8",\n"mother_is_warm_loving": "H1PF1",\n"father_is_warm_loving": "H1PF23"}\noutput_var = {"had_sexual_intercourse": "H1CO1",\n"used_birth_control_first_time": "H1CO3",\n"used_birth_control_most_recently": "H1CO6",\n"use_cocaine_freq": "H1TO35"}\nbase_test = AnalysisBase("addhealth_pds.csv",\nusecols=[\'H1TO35\', \'H1WP8\', \'H1PF1\', \'H1PF23\', \'AID\', \'H1CO1\', \'H1CO3\', \'H1CO6\'],\ndebug=True,\ninput_var=input_var,\noutput_var=output_var)'}, {'role': 'assistant', 'content': 'data_preprocessing'}]