[{'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:df["rot60_X"]=(0.5) * df["Y"] + (1.732/2) * df["X"]\ndf["rot60_Y"]=0.5 * df["Y"] - (1.732/2) * df["X"]\n\n\n\ndf_test["rot60_X"]=(0.5) * df_test["Y"] + (1.732/2) * df_test["X"]\ndf_test["rot60_Y"]=0.5 * df_test["Y"] - (1.732/2) * df_test["X"]\n\ndf["rot45_X"]=0.707 * df["Y"] + 0.707 * df["X"]\ndf["rot45_Y"]=0.707 * df["Y"] - 0.707 * df["X"]\n\ndf_test["rot45_X"]=0.707 * df_test["Y"] + 0.707 * df_test["X"]\ndf_test["rot45_Y"]=0.707 * df_test["Y"] - 0.707 * df_test["X"]\n\ndf["rot30_X"]=(1.732/2) * df["Y"] + 0.5 * df["X"]\ndf["rot30_Y"]=(1.732/2) * df["Y"] - 0.5 * df["X"]\n\ndf_test["rot30_X"]=(1.732/2) * df_test["Y"] + 0.5 * df_test["X"]\ndf_test["rot30_Y"]=(1.732/2) * df_test["Y"] - 0.5 * df_test["X"]\n'}, {'role': 'assistant', 'content': 'data_preprocessing'}]