[{'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:FD1=pd.to_datetime(['2012-03-07 09:00','2012-03-07 19:00'] , utc=True)\nFD2=pd.to_datetime(['2012-03-08 07:00','2012-03-09 11:00'] , utc=True)\nFD1_begin=pd.to_datetime('2012-03-06 12:00', utc=True)\nFD1_end=pd.to_datetime('2012-03-10 00:00', utc=True)"}, {'role': 'assistant', 'content': "['data_preprocessing']"}]