[{'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:recording = keystrokes[:1][\'keystrokes\'][0]\nlist_of_recordings = json.loads(recording)\nlist_of_recordings[0]\nsplit_list = []\nraw = pd.DataFrame(list_of_recordings[0])\nfor n in raw.index:\nsplit_list.append(raw[0][n].split(" "));\nsplit = pd.DataFrame(split_list,columns=[\'timestamp\',\'key\',\'action\'])'}, {'role': 'assistant', 'content': 'data_preprocessing'}]