[{'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:tips_data = list(db.tip.find({},{"business_id":1,"user_id":1, "_id":0}))\ntips_df = pd.DataFrame(tips_data)\ntips_data = []\nbusiness_data = list(db.business.find({},{"latitude":1,"longitude":1, "business_id":1, "city":1, "_id":0}))\nbusiness_df = pd.DataFrame(business_data)\nbusiness_data = []\ntips_loc_df = pd.merge(tips_df, business_df, on=\'business_id\')\ntips_df = []\nbusiness_df = []'}, {'role': 'assistant', 'content': 'data_preprocessing'}]