[{'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:# We need to apply same transformation on test set as we did we train set\n\ntest_prep = (test\n             .copy()\n             .pipe(timeseries_features)\n             .drop(['Open','Date'],axis=1)\n             )\n\ntest_prep  = pd.merge(test_prep,store_prep,how='left',on='Store')\ntest_prep['is_promo']   = test_prep.apply(lambda x: 1 if x['month'] in x['PromoInterval'] else 0,axis = 1)\ntest_prep  = pd.merge(test_prep,dict_for_test,how='left',on='Store')\ntest_prep = test_prep.drop(['PromoInterval','Store'],axis=1).reset_index(drop=True)\n"}, {'role': 'assistant', 'content': 'data_preprocessing'}]