[{'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:cols = ["Country","HIV2001", "HIV2005", "HIV2009", "HIV2013"]\nHIV_ordered = HIV[cols]\nHIV_ordered.columns = ["Country", "2001", "2005", "2009", "2013"]\nhighHIV = HIV_ordered[HIV_ordered["2013"] >10]\nhighHIV.set_index("Country", inplace = True)\nhighHIV_flipped = highHIV.T\nhighHIV_flipped.plot( figsize = (10,10))\npyplot.title("Changes over time in HIV Prevalance in Countries with High HIV Rates")\npyplot.ylabel("HIV Prevalance (%)")'}, {'role': 'assistant', 'content': 'data_exploration'}]