[{'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:files = [\n    'countries',\n    'age_gender_bkts',\n    'test_users',\n    'train_users',\n    'sessions'\n]\n\ndata = {}\nfor f in files:\n    data[f] = pd.read_csv('../input/' + f + '.csv')"}, {'role': 'assistant', 'content': 'load_data'}]