[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify the code snippets into categories from the provided list of categories. List of categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']"}, {'role': 'user', 'content': "Identify to which category the provided code belongs and assign the code snippet to at least 1 but up to 5 categories based on the probabilities, ignore if the probability of the category is negligible. Strictly provide your response as a list. Avoid providing any additional information, commentary, or personal opinions.\\nPython Code:month_func = lambda x: x.month\nday_func= lambda x: x.day\nday_of_year_func = lambda x: x.dayofyear\nweek_of_year_func = lambda x: x.week\n\n# train\ntrain['month'] = train.Date.apply(month_func)\ntrain['day'] = train.Date.apply(day_func)\ntrain['day_of_year'] = train.Date.apply(day_of_year_func)\ntrain['week'] = train.Date.apply(week_of_year_func)\n\n# test\ntest['month'] = test.Date.apply(month_func)\ntest['day'] = test.Date.apply(day_func)\ntest['day_of_year'] = test.Date.apply(day_of_year_func)\ntest['week'] = test.Date.apply(week_of_year_func)"}, {'role': 'assistant', 'content': "['data_preprocessing']"}]