[{'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:df = pd.read_csv('cleantable-mb.csv')\ndf = df.fillna(0.0)\ndf = df[df.SchoolYear<2010]\ndf = df.drop(['Y','Y2','LongTract','Zip','NextYearCount','TotalCountByTractGrade'],axis=1) #exclude some columns\ncorr = df.corr()\ncorr.Target.apply(abs).sort_values()"}, {'role': 'assistant', 'content': 'load_data'}]