[{'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:times_series_cntr = train_df.groupby([\'Date\',\'Country_Region\'])[\'ConfirmedCases\'].sum()\\\\\n                    .reset_index().set_index(\'Date\')\ndf_countries_tm = times_series_cntr[times_series_cntr[\'Country_Region\'].isin(list_countries)]\n\n\nplt.figure(figsize=(16,12))\nax = sns.lineplot(x=df_countries_tm.index, y="ConfirmedCases", hue="Country_Region", data=df_countries_tm,palette=\'muted\').set_title(\'Cumulative line\')\nplt.legend(loc=2, prop={\'size\': 12})\nplt.title(\'Cumulative trend plot for Confirmed Cases\')\nplt.xticks(rotation=90);\''}, {'role': 'assistant', 'content': 'result_visualization'}]