[{'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:test['StateHoliday'] = test['StateHoliday'].map({'0':0 , 0:0 , 'a':1 , 'b':2 , 'c':3})\ntest['StateHoliday'] = test['StateHoliday'].astype(int)\ntest['StoreType'] = test['StoreType'].map({'a':1 , 'b':2 , 'c':3 , 'd':4})\ntest['StoreType'] = test['StoreType'].astype(int)\ntest['Assortment'] = test['Assortment'].map({'a':1 , 'b':2 , 'c':3})\ntest['Assortment'] = test['Assortment'].astype(int)\ntest['PromoInterval'] = test['PromoInterval'].map({'Jan,Apr,Jul,Oct':1 , 'Feb,May,Aug,Nov':2 , 'Mar,Jun,Sept,Dec':3})\ntest['PromoInterval'] = test['PromoInterval'].astype(int)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]