[{'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:char_idx_file = 'char_idx.pickle'\nif os.path.isfile(char_idx_file):\nprint('Loading previous char_idx')\nchar_idx = pickle.load(open(char_idx_file, 'rb'))\nprint(type(char_idx))\nprint(len(char_idx))\n{k: char_idx[k] for k in sorted(char_idx.keys())[:10]}"}, {'role': 'assistant', 'content': 'data_exploration'}]