[{'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:staff_df = pd.DataFrame([{'Name': 'Kelly', 'Role': 'Director of HR'},\n{'Name': 'Sally', 'Role': 'Course liasion'},\n{'Name': 'James', 'Role': 'Grader'}])\nstaff_df = staff_df.set_index('Name')\nstudent_df = pd.DataFrame([{'Name': 'James', 'School': 'Business'},\n{'Name': 'Mike', 'School': 'Law'},\n{'Name': 'Sally', 'School': 'Engineering'}])\nstudent_df = student_df.set_index('Name')\nprint(staff_df.head())\nprint()\nprint(student_df.head())"}, {'role': 'assistant', 'content': 'load_data'}]