[{'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:def fix_date_time(df):\ndef extract_field(_df, start, stop):\nreturn _df['DateTime'].map(lambda dt: int(dt[start:stop]))\ndf['Year'] = extract_field(df,0,4)\ndf['Month'] = extract_field(df,5,7)\ndf['Day'] = extract_field(df,8,10)\ndf['Hour'] = extract_field(df,11,13)\ndf['Minute'] = extract_field(df,14,16)\nreturn df.drop(['DateTime'], axis = 1)\ntrain = fix_date_time(train)\ntest = fix_date_time(test)"}, {'role': 'assistant', 'content': "['data_preprocessing']"}]