[{'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:import pandas as pd\nimport vincent\nfilename = 'CC-EST2014-ALLDATA.csv'\nfilename ='CO-EST00INT-ALLDATA-01.csv'\ndf_cen = pd.read_csv(filename,encoding='latin-1', dtype={'STATE':str, 'COUNTY':str})\ndf_cen['FIPS'] = df_cen['STATE']+df_cen['COUNTY']"}, {'role': 'assistant', 'content': 'load_data'}]