[{'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:# 10\ntrain = train[cols]\n\n#\ntrain_X = train.drop("revenue",axis=1)\ntrain_y = train["revenue"]\n\n#revenue \ntrain_y = np.log1p(train_y)\n\n# \ntmp_cols = train_X.columns\ntest_X = test[tmp_cols]\n\n#\nprint("train_X: "+str(train_X.shape))\nprint("train_y: "+str(train_y.shape))\nprint("test_X: "+str(test_X.shape))\''}, {'role': 'assistant', 'content': 'data_preprocessing'}]