[{'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:import time\ndef my_timer(start_time):\nnow_time = time.time()\nelapsed = now_time - start_time\nhours, rem = divmod(elapsed, 3600)\nmins, sec = divmod(rem, 60)\nreturn "{0}:{1}:{2}".format(int(hours), int(mins), int(sec))'}, {'role': 'assistant', 'content': 'data_preprocessing'}]