[{'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:center_row, center_col = total_rows / 2, total_cols / 2\nprint("center_row = ", center_row, "AND center_col = ", center_col)\ndist_from_center = (X - center_row)**2 + (Y - center_col)**2\nradius = (total_rows / 2)**2\ncircular_mask = (dist_from_center > radius)\nprint(circular_mask[1500:1700,2000:2200])'}, {'role': 'assistant', 'content': 'data_preprocessing'}]